GRACE satellite monitoring and driving factors analysis of groundwater storage under high-intensity coal mining conditions: a case study of Ordos, northern Shaanxi and Shanxi, China | Observation par le satellite GRACE et analyse des facteurs déterminants du stockage des eaux souterraines dans les conditions d’une exploitation intensive du charbon: une étude de cas à Ordos, Nord-Ouest du Shaanxi et du Shanxi, Chine Monitoreo del satélite GRACE y análisis de factores impulsores del almacenamiento de agua subterránea bajo condiciones de la minería del carbón: un estudio de caso de Ordos, Shaanxi del Norte y Shanxi, China 高强度煤炭开采条件下地下水储量GRACE卫星监测及驱动因素分析——以中国鄂尔多斯、陕北及山西地区为例 Monitoramento pelo satélite GRACE e análise de fatores determinantes do armazenamento de águas subterrâneas sob condições de mineração de carvão de alta intensidade: um estudo de caso em Ordos, Shaanxi Setentrional e Shanxi, China
2020
Chen, Xuhui | Jiang, Jinbao | Lei, Tianjie | Yue, Chong
Coal mining in northwestern China is an important industry. For the traditional monitoring of water resources in coal-rich regions, a single monitoring well or remote-sensing image is often used to obtain the groundwater level or water body area. The process is restricted by the spatial distribution of monitoring wells and the quality of remote sensing images. The regions of Ordos, Northern Shaanxi (including Yan’an and Yulin cities), herein collectively referred to as OYY, and Shanxi (SX) were studied. Here, groundwater storage anomalies (GWSA) were derived using the gravity recovery and climate experiment (GRACE) satellite data and WaterGAP global hydrology model, and the change trend of groundwater storage (GWS) was explored. Using time series analysis and grey slope relational analysis, the potential driving factors of regional GWSA were derived and considered independent variables. In combination with GWSA, the quantitative relationship between the variables was established by partial least squares regression. Results showed that: (1) the decreasing rate of GWS in OYY and SX reached –0.65 and –1.16 cm/year, respectively, from 2003 to 2014; (2) the main driving factors leading to the reduction of GWS included coal-mining water consumption for OYY and water consumption by coal mining and agricultural irrigation for SX, and the weights of water consumption by coal mining and agricultural irrigation for SX were both 50%. Therefore, GRACE satellite data show good application in groundwater monitoring of coal-mining concentrated areas, providing an important basis for the formulation of water resource management measures.
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