|Table of Contents|

Causes of Groundwater Level Distribution in the Unloading Relaxation Area of the Upper Lancang River Valley, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第06期
Page:
1414-1426
Research Field:
水资源与水文地质
Publishing date:

Info

Title:
Causes of Groundwater Level Distribution in the Unloading Relaxation Area of the Upper Lancang River Valley, China
Author(s):
HUANG Rui-rui1;  WANG Jin-guo1*;  CHENG Wei2;  HAN Zhi-ying1;  YOU Lin2;  YANG Yun1;  ZHU Chun1
(1. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, Jiangsu, China; 2. Kunming Engineering Corporation Limited, PowerChina, Kunming 650051, Yunnan, China)
Keywords:
hydrogeology;  groundwater level;  numerical simulation;  unloading relaxation;  water balance;  non-homogeneous;  anisotropy;  Lancang River
PACS:
P641.6
DOI:
10.19814/j.jese.2023.03013
Abstract:
The phenomena of strong unloading relaxation and low groundwater level are common on both sides of the upper Lancang River. In-depth study on hydrogeological characteristics of slope unloading relaxation area can provide a basis for seepage characteristics analysis and seepage control design of hydropower projects during operation. The causes of low groundwater level in the deep-cut valley of Lancang River are complex. A hydropower dam site in the upper Lancang River was selected as the research object; the causes of low groundwater level from regional and local conditions were analyzed; and the hydrogeological structure and groundwater flow models were finally constructed for the dam site area, considering the unloading relaxation partition to simulate and verify the groundwater seepage law under natural conditions. The results show that the low groundwater level in the study area is not only controlled by the joint action of regional groundwater flow and Lancang River, but also an internal manifestation of local hydrogeological conditions, such as bank slope, surface slip zone, rock structure and unloading fissure, which hinder the rainfall infiltration; the rainfall runoff is controlled by the topography, and is mainly discharged to Lancang River through the surface and strong unloading fissures, and the rainfall infiltration recharge only accounts for 5.50% of the total groundwater recharge.

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Last Update: 2023-12-01