Xi’an Center of China Geological Survey Ministry of Natural Resources Xi’an 710054 ChinaKey Laboratory for Geo-hazards in Loess Area Ministry of Natural Resources Xi’an 710054 ChinaField Base of Scientific Observation of Shaanxi Tongguan Ministry of Natural Resources Xi’an 710054 China;
Xi’an Center of China Geological Survey Ministry of Natural Resources Xi’an 710054 ChinaKey Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region Ministry of Education Xi’an 710054 ChinaKey Laboratory for Geo-hazards in Loess Area Ministry of Natural Resources Xi’an 710054 ChinaField Base of Scientific Observation of Shaanxi Tongguan Ministry of Natural Resources Xi’an 710054 China;
School of Earth Science and Land Resources Chang’an University Xi’an 710054 China;
School of Earth Science and Land Resources Chang’an University Xi’an 710054 ChinaAl-Azhar University Assiut Branch 71524 Egypt;
Xi’an Center of China Geological Survey Ministry of Natural Resources Xi’an 710054 ChinaKey Laboratory for Geo-hazards in Loess Area Ministry of Natural Resources Xi’an 710054 China;
Mercury speciation; Hyporheic zones; Constant surface water level; Flood level; Surface-groundwater; Hydraulic connection; Tongguan gold mining areas; Loess Plateau; Shannxi Province;