Assessment of Red Bed Groundwater in the Jinqu Basin, Southeastern China: Its Enrichment Regularity and Emergency Exploi
- PDF / 9,604,026 Bytes
- 27 Pages / 595.276 x 790.866 pts Page_size
- 95 Downloads / 139 Views
Original Paper
Assessment of Red Bed Groundwater in the Jinqu Basin, Southeastern China: Its Enrichment Regularity and Emergency Exploitation Potential Yu Zhao,1,2 Yongfa Zhang ,1,3 Haiqing Yang,1 Xin Tian,1 Haque Md. Emdadul,1 and Faouziatou Mouhamadou1 Received 15 November 2019; accepted 29 April 2020
Due to unbalanced spatial distribution and insufficient capacity allocation of water resources in the Jinqu Basin, developing and utilizing the red bed groundwater require an effective method to address emergency water supply in this area. In this paper, geoelectric surveys employing high-density electrical resistivity tomography method were conducted to explore the geoelectric characteristics of red bed aquifer; six survey lines were arranged. The inverted resistivity profiles were validated by available borehole data and geological information. According to the notable resistivity differences between adjacent formations, the results revealed four primary geoelectric layers (Quaternary sediments, fractured siltstone aquifer, sandy conglomerate aquifer and calcareous siltstone beds) and two groundwaterstorage structures (layered pore–fissure structure and vein–fault structure). Moreover, a water-rich region was delineated based on groundwater distribution and water yield of neighboring wells (> 500 m3/day). To assess further the potential of red bed groundwater, we established a hydro-geological numerical model of the water-rich region using groundwater modeling system. Aquifer permeability heterogeneity was considered by fitting the permeability coefficients collected from outcrops. The model was identified and verified by the water table at observed wells and subsequently employed to predict variation of groundwater level under different exploitation schemes. The simulation showed that shortterm emergency exploitation has relatively less impact on regional groundwater environment, which demonstrates that the recovery capacity of water-rich region is good enough to cope with emergency exploitation. These findings provide important references for rational allocation and exploitation of red bed groundwater. KEY WORDS: Red bed groundwater, High-density electrical resistivity tomography method, Enrichment regularity, GMS simulation, Emergency exploitation potential.
INTRODUCTION
1
School of Civil Engineering, Chongqing University, Chongqing 400045, China. 2 College of Civil Engineering, Guizhou University, Guiyang 550025, China. 3 To whom correspondence should be addressed; e-mail: [email protected]
Red beds commonly formed in the Mesozoic and Cenozoic are a series of red continental clastic sediments, consisting of sandstone and gravel (Stel 2009; Wang et al. 2016). Available geological data (Swanson-Hysell et al. 2019) reveal that red beds are primarily distributed in the north, northwest and
2020 International Association for Mathematical Geosciences
Zhao et al. southeast of China, and the Jinqu Basin is the Chinese largest red bed basin with an area of 3500 km2. The basinÕs lithology is fractured and interc
Data Loading...
