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2024 Vol. 11, No. 4
Published: 2024-08-20
 
1 Current status and prospects of marine natural resource survey in China
CHEN Bin, ZOU Liang, XU Gang, XUE Biying, WANG Milei, YUE Baojing, QIU Jiandong, XU Shuai, HU Rui, ZHANG Yiyan
DOI: 10.19388/j.zgdzdc.2024.259
Marine natural resources are an important guarantee for the national economy and social development, as well as a necessary foundation for the construction of maritime power and ecological civilization. In order to fully support the Ministry of Natural Resources in fulfilling its “two unifications” responsibilities, China Geological Survey has organized and implemented comprehensive surveys and evaluations of marine natural resources. And pilot demonstrations have been conducted for the comprehensive survey and evaluation of marine natural resources in key marine areas of China. Based on the marine natural resources comprehensive survey and evaluation data, and the additional investigation and evaluation results of marine geology, marine biology, physical oceanography, the authors identified the main characteristics of marine mineral resources, marine energy, marine biology, marine space, and other marine natural resources in China. By reviewing and summarizing the research progress of domestic and international natural resource systems, and based on the basic national conditions of China, the authors proposed a preliminary three-level classification system for marine natural resources involving multiple disciplines and categories. This classification system was guided by the theories of natural resource science and earth system science, in conjuction with the basic principle of comprehensive natural resource management, and with the natural attributes of resources and relevant national laws and regulations. Three methods for constructing standard systems for marine natural resource surveys have been proposed, from different perspectives such as classification systems, spatial stratification, and workflow. In the next step, efforts will be made to strengthen geological scientific and technological innovation capabilities, and accelerate the construction of a dynamic marine natural resource database. The public service level for marine natural resources will be rapidly improved, and the comprehensive monitoring system for marine natural resources will be further enhanced, promoting the high-quality development of marine natural resource work.
2024 Vol. 11 (4): 1-16 [Abstract] ( 46 ) RICH HTML PDF (39251 KB)  ( 124 )
17 Characteristics analysis of CO2 environmental background baseline for potential carbon sequestration sites in Yellow River Delta
WANG Xinwen, ZHU Yutong, LI Cai, GUO Chaobin, ZHANG Baojian, HE Qingcheng, YANG Lichao
DOI: 10.19388/j.zgdzdc.2024.280
The large-scale sequestration of CO2 may result in leakage, which could intrude into the shallow subsurface and cause environmental impacts. Due to the complex changes of natural processes, accurately determining baseline values and distributions is crucial for monitoring and controlling near-surface leakage. This study utilized portable devices along scheduled path to conduct mobile and field monitoring and sampling laboratory test, and monitored and analyzed atmospheric and soil gas components and CO2 concentrations at potential sequestration sites in Yellow River Delta to determine baseline values and distributions. The results indicate that: ① in the monitoring maps of three different layers, CO2 concentration data from the portable monitoring method are consistent with the continuous monitoring data from the fixed monitoring points, indicating the periodic fluctuation characteristics of the monitored CO2 concentration. Additionally, the statistically significant relationship between $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ and CO2 and O2 content confirms the reliability of the portable monitoring method.② Two environmental background baseline values are established. The first is $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ and δ13COC baseline, with the soil $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ isotope values of -14.35‰~-20.95‰, atmospheric $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ values of -16.92‰~-19.89‰, and soil δ13COC values of -20.59‰~-24.79‰. These values revealed the range of carbon isotope values produced by biological activity in temperate climates. The second is atmospheric and soil CO2 concentration baseline, with the atmospheric CO2 concentration of 219.20~416.4 ppm, soil CO2 concentrations at 30 cm depth of 1 002.793~14 808.13 ppm, and soil CO2 concentrations at 50 cm depth of 1 497.26~19 658.59 ppm. The environmental CO2 concentration and isotope baseline of shallow surface in potential carbon sequestration sites of Yellow River Delta were confirmed in this research, providing reference benchmarks and monitoring scheme recommendations for future surface monitoring after large-scale CO2 sequestration.
2024 Vol. 11 (4): 17-25 [Abstract] ( 25 ) RICH HTML PDF (9468 KB)  ( 113 )
26 Application of high-precision magnetic measurement in the exploration of hidden magnetite deposits: A case study of Caozhuangzi area in Qian'an of the eastern Hebei Province
LV Shui, LI Yankang, XU Man, XING Yuntao, LIU Hailong, NAN Shaowei
DOI: 10.19388/j.zgdzdc.2024.147
The iron ore mineralization belt in Qian'an area of the eastern Hebei Province is one of the important sedimentary metamorphic iron ore producing areas in China, and the natural type of ore is mainly magnetic. Most of the iron ore deposits discovered in Qian'an area are in resource depletion state, with the improvement of mining and development degree. So there is an urgent need to search for hidden iron ore in this area. The magnetic anomaly characteristics of the study area were identified after high-precision ground magnetic measurements in Caozhuangzi area of Qian'an in the eastern Hebei Province. The research results indicate that the magnetic anomalies in the study area are mainly caused by concealed magnetic bodies. Thick and large iron ore bodies were discovered in the deep part through drilling verification, and the magnetic anomalies corresponded well with the hidden iron ore bodies observed during the drilling process, indicating that high-precision magnetic measurement has a good prospecting effect for the deep hidden iron ore bodies in the metamorphic rock area of the eastern Hebei Province. This study could provide some references for iron ore exploration in Qian'an area.
2024 Vol. 11 (4): 26-32 [Abstract] ( 30 ) RICH HTML PDF (6284 KB)  ( 90 )
33 Main controlling factors of tight oil enrichment and high yield in a certain area of TH depression in Ordos Basin
WANG Zhao
DOI: 10.19388/j.zgdzdc.2023.325
A certain area of TH depression in Ordos Basin has tight reservoir and good oil-gas exploration potential, but the main controlling factors of tight oil enrichment and high yield are not clear, which seriously restricts the efficient exploration and development of this area. The geological characteristics of the reservoir in the study area were studied on the basis of seismic, drilling, geochemistry and dynamic production data. The tight oil accumulation conditions in member 8 of Yanchang Formation (Chang 8 member) were sorted out, and the main accumulation models were established to identify the main controlling factors of tight oil enrichment and high yield. The results are as follows.① The high quality source rock and upper mudstone cover of member 7 of Yanchang Formation (Chang 7 member) are widely distributed, and the underwater distributary channel of Chang 8 member is favorable for reservoir development. The oil-gas is injected downward from source rocks of Chang 7 member to the sand body of Chang 8 member. And the cycle source matching and preservation conditions are favorable, resulting in the formation of a tight sandstone reservoir. ② The size and physical properties of the reservoir sand body control the oil reserves and hydrocarbon abundance. The physical properties of tight sandstone are improved by the fractures formed by Yanshanian tectonics, and the corresponding fracture development area is the main area with oil production greater than 1t per day. ③ The upwelling of normal faults with smaller drilling intervals in the horizontal segment has a good development effect, while the downwelling of normal faults with larger drilling intervals in the horizontal segment has a poor development effect. Favorable reservoir facies belt, effective fracture reconstruction and well location configuration are the main factors controlling tight oil enrichment and high production. The research achievements have guiding significance for the subsequent well location deployment and reservoir development in the study area.
2024 Vol. 11 (4): 33-41 [Abstract] ( 25 ) RICH HTML PDF (10111 KB)  ( 43 )
42 Detrital composition of Tiesiao Formation and Liangjiehe Formation of Nanhua System in Songtao Highland of the northeastern Guizhou Province and tectonic setting of its source regions
LONG Jianxi, ZHOU Qi, ZHANG Sui, ZHU Luyan, YANG Zhongqin
DOI: 10.19388/j.zgdzdc.2023.280
The tectonic properties of Xuefeng movement has significant controversies. This study anglyzed the terrigenous detrital composition of Tiesiao Formation and Liangjiehe Formation of Nanhua System in Songtao Highland of the northeastern Guizhou Province, using Dickinson triangle diagrams theory. The results show that the terrigenous detrital source mainly comes from arc orogen sources and recycled orogen provenances, accompanied by volcanic activities. The maturity of the detrital components in Tiesiao Formation is relatively low, and the components mainly landed around the volcanic arc source area, showing the characteristics of near erosion and transporting accumulation. The quartz content in Liangjiehe Formation is higher than that in Tiesiao Formation, which lands in the recycled orogen provenances. The detrital composition contains basalt, andesitic basalt, trachyte, tuff, ignimbrite, rhyolite, felsic mylonites and so on, indicating that intracontinental rift and intraplate orogenic mechanism occurred during or before the sedimentation of Tiesiao Formation and Liangjiehe Formation in the study area. This research could provide some microscopic evidence for tectonic attribute of Xuefeng movement.
2024 Vol. 11 (4): 42-49 [Abstract] ( 17 ) RICH HTML PDF (14512 KB)  ( 78 )
50 Volcanic eruption cycles division and characteristics in Huolinhe area of the central and southern Greater Khingan Mountain
LIU Yonggao
DOI: 10.19388/j.zgdzdc.2023.331
Huolinhe area in the central and southern Greater Khingan Mountain has experienced strong volcanic activities since Mesozoic Era, and widely distributed intermediate acidic volcanic rocks were formed from Middle Jurassic to Early Cretaceous, which is a desirable area for evolution characteristics research of volcanic eruption during Mesozoic Era. The triple mapping method of “volcanic lithology and lithofacies, volcanic structure, and rock strata” was used in Huolinhe area to summarize and analyze the lithology, lithofacies, volcanic eruption cycles, and rhythmic characteristics. The result shows that the types of exposed rock types in this area can be divided into six categories, including ordinary pyroclastic rocks, fused pyroclastic rocks, lava, sedimentary pyroclastic rocks and pyroclastic sedimentary rocks, and latent volcanic rock. And there are eight types of lithofacies, including explosive facies, pyroclastic flow facies, volcanic eruption collapse facies, overflow facies, volcanic eruption sedimentary facies, volcanic neck facies, intrusive facies, and subvolcanic lithofacies. The volcanic activity in this area can be divided into six volcanic eruption cycles: Xinmin period ((163.7±1.7)~(160.0±4.0) Ma), Tamulangou period ((164.2±4.1)~(159.7±2.7) Ma), Manketouebo period ((163.4±1.3)~(157.0±1.1) Ma), Manitu period ((151.4±2.6)~(144.0±2.8) Ma), Baiyingaolao period ((141.7±1.3)~(128.6±1.4) Ma), and Meiletu period ((133.4±1.5)~(127.7±1.4) Ma), corresponding to the six volcanic rock stratigraphic formation. Volcanic activity was unstable in Huolinhe area during Middle Jurassic. A small amount of acidic volcanic debris erupted and were accompanied by many intermittent periods, followed by mainly calm overflow of neutral lava in the late phase. There was a strong eruption of acidic volcanic clastic rocks during Late Jurassic, accompanied by a small amount of medium acidic volcanic lava overflow. In the early stages of Early Cretaceous, the early stage volcanic activities were characterized by strong eruption of acidic volcanic clastic rocks, and the late stage volcanic activities were characterized by calm overflow of medium basic volcanic lava. The volcanic activities in this area could represent the characteristics of the eruption cycles of Mesozoic volcanic rocks in the central and southern Greater Khingan Mountain. Therefore, the research result is of great significance to the reasonable division of the eruption cycles of Mesozoic volcanic rocks in the central and southern Greater Khingan Mountain, and could help promote in-depth comparative studies of volcanic rock combinations, volcanic activity characteristics, lithofacies construction, and volcanic stratigraphy in different regions.
2024 Vol. 11 (4): 50-61 [Abstract] ( 23 ) RICH HTML PDF (11816 KB)  ( 131 )
62 Geochemical process and ecogeological effects of bedrock weathering in the rocky desertification area of Guizhou Province
HUANG Yanpeng, LIU Jianyu, ZHANG Ce, JIE Wenhui, KANG Yihua
DOI: 10.19388/j.zgdzdc.2023.183
Rocky desertification is widely distributed in karst areas of Southwest China, especially in Guizhou Province, posing a serious threat to the local ecological environment security. In order to clarify the internal relationship between the bedrock weathering and the degree of rocky desertification, the authors in this paper comprehensively analyzed the content of major and trace elements and the law of migration and evolution, mineral composition characteristics, and the ability of weathering and soil formation for the rocky desertification sections with different desertification degree in Guizhou Province. The results show that the soil material in rocky desertification area is the result of soluble material dissolution in carbonate rocks and the continuous accumulation of acid insoluble material in situ. The rocky desertification sections with different degrees are in a high degree of weathering, and mineral weathering trend in sections, also shows that the higher the degree of rocky desertification, the higher the degree of soil layer weathering phenomenon. The development of rocky desertification is closely related to the migration model of elements in the process of bedrock weathering. The higher the content of soluble elements in carbonate bedrocks, the less the residual soil material produced by bedrock weathering, and the higher the development degree of rocky desertification. The analysis of the geochemical characteristics of bedrock and ecological geological effects of weathering in the rocky desertification area could provide some references for the study of the genetic mechanism of rocky desertification, and is also of great significance to the rocky desertification controlling and the promotion of the sustainable development of regional economy.
2024 Vol. 11 (4): 62-71 [Abstract] ( 26 ) RICH HTML PDF (9844 KB)  ( 82 )
72 Groundwater chemical characteristics and analysis of the controlling factors in parallel ridge valley area of Guang'an City
ZHANG Wei, CHEN Wenbin, LI Jian, ZHAO Mingxuan, CHENG Jian
DOI: 10.19388/j.zgdzdc.2023.229
The eastern Qujiang of Guang'an City is a typical paralleled ridge valley area with unique hydrogeological conditions. The Piper triplex map, Gibbs map, Phreeqc software, ion proportional coefficient map and Pearson correlation analysis methods were used to study the chemical characteristics and the controlling factors of groundwater. And the spatial distribution of groundwater chemical components, water-rock interaction types and groundwater chemical components source and its controlling factors were comprehensively analyzed combined with regional hydrogeological conditions. The results show that shallow groundwater in the study area is low TDS fresh water. The shallow groundwater anions are mainly $\mathrm{HCO}_{3}^{-}$, $\mathrm{SO}_{4}^{2-}$, and the cations are mainly Ca2+, Na+. The groundwater types are mainly $\mathrm{HCO}_{3}^{-}$-Ca2+, $\mathrm{HCO}_{3}^{-}$-Ca2+.Mg2+ and HCO3-Ca2+·Na+. The groundwater hydrochemical component mainly comes from the weathering of carbonate rock and silicate karst filtration, and salt rock has little effect on groundwater. The potassium salt, gypsum, anhydrite, salt rock and fluorite in groundwater are all in the unsaturated state, and the related minerals in the strata are the sources of related ions in groundwater. The chemical components of groundwater are mainly controlled by leaching, positive cation exchange, coal mining and agricultural activities. The research results could provide some scientific basis for the rational development and utilization of water resources in the study area, ecological environmental protection, and economic derelopment of Chengdu-Chongqiang region.
2024 Vol. 11 (4): 72-81 [Abstract] ( 28 ) RICH HTML PDF (13578 KB)  ( 98 )
82 Analysis and evaluation of heavy metal and eutrophication characteristics in the surface seawater of Fangchenggang Sea in Guangxi
PANG Guotao, LI Wei, YANG Yuanzhen, ZHANG Xiaolei, LUO Junsheng, MA Ruqiang
DOI: 10.19388/j.zgdzdc.2023.243
The research on heavy metals and nutrients in seawater is of great significance to the understanding of the balance of marine ecosystems, the assessing of the quality of marine environment, and the formulating of the protection strategies. In order to study the water quality of the surface seawater in Fangchenggang sea, the authors carried out an investigation in Fangchenggang sea in September 2021 to analyze the Dissolved Oxygen (DO), Chemical Oxygen Demand (COD), Dissolved Inorganic Nitrogen (DIN), Dissolved Inorganic Phosphorus (DIP), and 5 heavy metal contents (Cu,Pb,Cd,Zn,As) of the seawater. The seawater quality was evaluated using single factor index, water quality index, organic pollution index, and eutrophication index. The results show that except for DIN and DIP, all the other factors in the surface seawater of Fangchenggang sea are superior to Class II seawater quality standard. The single factor evaluation show that the main exceeding factors were DIP and DIN, with the exceeding rates of 70% and 98%, respectively. The comprehensive pollution index method for water quality evaluation indicates that the entire sea is in mild or above pollution. The evaluation results of heavy metal risk entropy show that the main risk elements in Fangchenggang sea are Cu, Cd, and Zn. The whole sea area is in organic pollution state based on eutrophication index and organic pollution index, and 55% of the area is in eutrophic state, mostly concentrated in the southern waters of Qisha Peninsula and Fangchenggang waterway. Further analysis indicates that DIN and DIP are mainly affected by the marine aquaculture industry and coastal sewage discharge. The main sources of the five heavy metals are marine transportation, marine aquaculture and industrial wastewater discharge, mixed input source, with the relative contribution rates of 18%, 8%, and 74%, respectively. This could provide some scientific basis for the sustainable development, marine environmental protection, and governance of Fangchenggang sea.
2024 Vol. 11 (4): 82-91 [Abstract] ( 45 ) RICH HTML PDF (5753 KB)  ( 58 )
92 Analysis of the disaster-pregnancy geological conditions of collapse and landslide based on GIS: A case study of Jiali County in Tibet
SUN Xiaoyong, WEI Long, TANG Hua, LIU Zichang
DOI: 10.19388/j.zgdzdc.2023.219
Jiali County has strong tectonic action, steep terrain, and poor geological environment conditions. The original terrain was destroyed by the construction of national highway G349 from 2018 to 2022, resulting in a sharp increase in the number of geological disasters in the county. The occurrence rate of geological hazard is high during flood period and heavy rain period. This paper fully collected the geological disaster data of Jiali County from 2018 to 2023 to analyze the distribution of geological disasters and disaster-pregnancy geological conditions in detail, based on field investigation and GIS platform. The analysis of disaster-pregnancy geological conditions mainly selects landform, geological structure, stratigraphic lithology, land use type and human engineering activities. And disaster-pregnancy factors include elevation, to pography, profile curvature, fault density, water density, engineering geological rock group, land use type and distance from highway. The results show that the most important disaster-pregnancy geological conditions in the county are human engineering activities, topography, geological structure, engineering geological rock group and land use type. According to the characteristics of the geological conditions in the region, the county was divided into 5 disaster zones, and the distribution and development law of geological disasters and the characteristics of geological conditions in each zone were expounded in detail. The analysis of disaster-pregnancy geological conditions in Jiali County is helpful to understand the development law of geological disasters, and establish the geological disaster prevention and risk management system, which could provide basic references for geological disaster prevention and management and territorial space planning.
2024 Vol. 11 (4): 92-100 [Abstract] ( 28 ) RICH HTML PDF (16779 KB)  ( 97 )
101 The excavation deformation mechanism and the seismic reinforcement effect evaluation of complex accumulation slope of a converter station in Southern Sichuan
YIN Dong, WANG Shangjie
DOI: 10.19388/j.zgdzdc.2023.319
The excavation deformation mechanism of the widely distributed complex accumulation slopes in the southwestern mountainous areas has a significant restriction effect on the construction of converter stations. To address the urgent needs of the converter station construction in Baihetan-Jiangsu UHV transmission project, the authors in this paper took the accumulation slope in the proposed station site as the research object, and adopted the deep displacement monitoring, in-situ test and FLAC3D numerical simulation methods to evaluale the excavation deformation mechanism of this accumulation slope and the seismic reinforcement effect under different design schemes and different pile parameters. Then the seismic reinforcement mechanism is analyzed. The results are as follows. ① The excavation of the complex accumulative slope of “multi-genetic type soil” in the converter station is prone to deformation, and the instability mode is “traction creep and tension failure mode”. ② The high and steep free face formed in the excavation process is the main factor leading to the accumulation slope deformation, and the high-water sensitivity of the accumulation slope soil is the internal inducement of the slope deformation aggravation after short duration heavy rainfall. ③ Under the two slope reinforcement schemes of circular anti-slide pile and rectangular anti-slide pile, the deformation amount of the slope body is significantly reduced, and the maximum deformation position in the slope body is located in the middle and back of the slope body. The stability coefficient of the accumulation body slope under natural and seismic conditions meets the design requirements. The use of rectangular anti-slide pile in the treatment of the accumulation body slope has higher anti-slide retaining and economic benefits. ④ The top deformation of the anti-slide pile is the largest under seismic condition, and the shear force and bending moment increase first and then decrease with the increase of seismic wave, and finally reach the maximum change trend. The maximum bending moment value is about 1/2 of the anti-slide pile body. The retaining design of slope should be combined with the distribution law of pile shear force and bending moment. The research results of this paper could provide some references for the design and construction of similar projects.
2024 Vol. 11 (4): 101-113 [Abstract] ( 21 ) RICH HTML PDF (26338 KB)  ( 130 )
114 Landslide risk assessment in Miluo City of Hunan Province
ZHONG Linjun, WANG Jixiang, ZHAO Shuanglin, DAI Cong, ZHANG Shuai
DOI: 10.19388/j.zgdzdc.2024.102
Miluo City of Hunan Province features diverse and complex topography, rich landforms, and frequent human activities, resulting in a relatively high incidence of landslides. In order to prevent the casualties caused by landslides, the authors conducted landslide risk assessment and proposed corresponding risk control measures. Firstly, the latest landslide data for Miluo City were collected, and susceptibility of landslides in Miluo City was assessed using certainty factors and a neural network multi-layer perceptron approach, on the basis of factors such as elevation, slope, and face of slope. Then, the landslide hazard under rainfall conditions was evaluated. And the data of buildings, roads, and the population distribution threatened by landslide were collected to assess the landslides vulnerability in Miluo City. Finally, landslide risk assessments results were obtained through matrix degree division and risk control strategies were discussed. The results indicated that the western and eastern part of Chuanshanping Town, the western and eastern part of Bishi Town, the eastern part of Sanjiang Town and the eastern part of Changle Town were in high risk of landslides. The areas cover approximately 239.56 km2 and encompassed 103 landslides, accounting for 72.54% of the total landslides. Effective landslide risk control requires a combination of point control and area control, implementing both people-oriented and technical preventive measures. The research findings could contribute to the scientific and rational implementation of disaster prevention, reduction, and post-disaster rescue efforts, holding significant practical importance in enhancing social safety, stability, and economic development.
2024 Vol. 11 (4): 114-123 [Abstract] ( 25 ) RICH HTML PDF (17686 KB)  ( 99 )
124 The formation mechanism of G132 landslide in China-Myanmar oil and gas pipeline (Myanmar Section) and its integrated control countermeasures
LUO Benquan, WANG Po, LI Shuncheng, XU Jiang, LU Wenxiao, HUANG Rui
DOI: 10.19388/j.zgdzdc.2024.113
In order to effectively improve the comprehensive management level of geological disasters in oil and gas pipelines, the authors in this research adopted engineering geological analysis principles and methods to conduct a detailed analysis of the retrogressive landslide caused by gully source tracing, and formulate appropriate comprehensive management countermeasures, combined with the geological environmental conditions of G132 landslide in China-Myanmar Pipeline (Myanmar Section) and the continuous deformation characteristics of the landslide in recent years. Three deformation stages of the retrogressive landslide caused by gully source tracing were basically divided through the analysis of the landslide evolution model, including gully incision and slope deformation stage, the retrogressive sliding deformation stage and the overall sliding deformation stage. The practical and feasible integrated control counter measures of “zoning and graded retaining, source blocking and bed consolidation, and combination of interception and drainage” were put forward, based on the deformation characteristics, formation mechanism and evolution model of the landslide. This strategy has been implemented step by step, and it has passed through many flood seasons with good engineering results. This research could provide certain references for similar projects related to retrogressive landslides caused by gully source tracing in the future and has great significance in controlling and reducing geological disasters of oil and gas pipelines and protecting the safe operation of China Myanmar Pipelines.
2024 Vol. 11 (4): 124-131 [Abstract] ( 24 ) RICH HTML PDF (9702 KB)  ( 72 )
132 Analysis of coal mining subsidence characteristics and stability based on InSAR monitoring data: A case study of the Mining and Land Integration Demonstration Zone in Pei County of Jiangsu Province
TANG Zhigang, QIAN Jing, XIE Mengyu, SUN Xiaoqian, MENG Xianzhong, ZHANG Fengming
DOI: 10.19388/j.zgdzdc.2023.267
In order to identify the spatiotemporal development characteristics, development trends, and risk levels of coal mining subsidence areas in Peixian County of Jiangsu Province, and better guide geological disaster prevention and ecological environment restoration work, the authors in this paper carried out the surface subsidence monitoring using multi period Sentinel-1 satellite synthetic aperture radar interferometry data technology, based on the analysis of coal mining data and field investigation results. By analyzing the surface deformation of the coal mining subsidence area from 2018 to 2022 using InSAR monitoring data, the authors concluded that the surface of the subsidence area had sunk by 0.139 to 0.558 meters from 2018 to 2022, and the surface subsidence rate of the subsidence area was 0.000 to 2.159 mm/d from June to December in 2022. The settlement amount of the stable subsidence goaf (old goaf) has approached its maximum value, and the settlement rate is gradually decreasing and approaching 0. The settlement amount and settlement rate of the unstable subsidence goaf (new goaf) started from 0 and gradually increased. The unstable subsidence area was approximately 18.45 km2 at the end of 2022, mainly distributed in Zhangshuanglou and other coal mines explored in the past 5 years. The surface InSAR data could better reflect the deformation characteristics. This study could provide some scientific basis for the comprehensive management of coal mining subsidence areas in Pei County, and provide some references for characteristic analysis and comprehensive management of coal mining subsidence areas in other similar regions.
2024 Vol. 11 (4): 132-139 [Abstract] ( 33 ) RICH HTML PDF (11937 KB)  ( 58 )
140 Exploration on the theory and practice of “double evaluation” of county-level territorial space: A case study of Qingxu County in Shanxi Province
SUN Yingjie, PAN Jianyong, LV Yonggao, ZHU Jiliang
DOI: 10.19388/j.zgdzdc.2023.346
Resource and environment carrying capacity and suitability evaluation of territorial space development are the basis of territorial space planning. The county-level territorial space planning plays a role of linking the preceding and the following, so “double evaluation” is the key issue of how to support the county-level territorial space layout. The authors in this paper took Qingxu County of Shanxi Province as the research area, and focused on four key issues, including the selection of resource and environment elements, suitability evaluation of territorial spatial development, resource-environment carrying capacity evaluation, and optimization of territorial space planning. The territorial space optimization model was proposed based on the resource and environment elements analysis by short-board and long-board theory and the regional characteristics plus up-down coordination. Besides, the county-level “double evaluation” framework system adapted to regional characteristics was constructed. The results show that Qingxu County is basically a suitable area for agricultural production and urban construction, except for the western mountainous area and both sides of Fenhe River, which are extremely important areas for ecological protection. The scale of agricultural production and urban construction in Qingxu County is mainly restricted by water resources, and some agricaltural irrigation areas in this region have already exceeded their water resources carrying capacity. The priority development areas of Qingxu County's ecological, agricultural and urban development were reasonably divided. Meanwhile, suggestions for the optimization of county-level ecological space, agricultural space and urban space were put forward, which could provide some basic support for the detailed layout of county-level territorial space in Qingxu County.
2024 Vol. 11 (4): 140-148 [Abstract] ( 25 ) RICH HTML PDF (7512 KB)  ( 103 )
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