Volume 45 Issue 12
Dec.  2020
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Wang Zejun, Zhou Hong, Qi Lingxuan, Wang Jiyuan, Yan Ziqi, 2020. Method for Characterizing Structure and Hydrological Response in Karst Water Systems: A Case Study in Y-M System in Three Gorges Area. Earth Science, 45(12): 4512-4523. doi: 10.3799/dqkx.2020.261
Citation: Wang Zejun, Zhou Hong, Qi Lingxuan, Wang Jiyuan, Yan Ziqi, 2020. Method for Characterizing Structure and Hydrological Response in Karst Water Systems: A Case Study in Y-M System in Three Gorges Area. Earth Science, 45(12): 4512-4523. doi: 10.3799/dqkx.2020.261

Method for Characterizing Structure and Hydrological Response in Karst Water Systems: A Case Study in Y-M System in Three Gorges Area

doi: 10.3799/dqkx.2020.261
  • Received Date: 2020-07-16
  • Publish Date: 2020-12-15
  • In order to describe the structure and hydrological response mechanism of the karst water systems, the dispersion model, the diffusion model, the standard attenuation curve, and the Gaussian mixture models are presented for identifying the structure and explaining hydrological response. Successful application of these methods in the Y-M karst water system in the Three Gorges area shows that "single recharge-single discharge", "single recharge-multiple discharges" and "multiple recharge-single discharge" flow path patterns occurred in the area. After rainfalls, groundwater was dominated by convection in the response stage, while diffusion in the attenuation stage. The groundwater runoff components were divided into 5 and 6 grades for the rainy season and dry season, respectively. The conductivity and discharge thresholds dividing fast and slow flow were determined to be approximately 180 μS/cm and 0.6 m3/s, respectively, with fast flow exhibiting lower conductivity and larger discharge. On an quarterly basis, fast flow occurred 3.5% of the time and accounted for 19% of total water volume. The fast flow moved in the conduits, leading to the sharply variation of discharge and electrical conductivity, while the slow flow moved in the fissures and pores, which resulted in weak response. This study provides novel alternative methods for quantitative evaluation of structure and hydrological response of karst water systems.

     

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