柴达木盆地西缘尕斯库勒湖流域地下水流数值模拟及地下水资源评价
Numerical Simulation of Groundwater Flow and Evaluation of Groundwater Resources in Gasikule Lake Basin,Western Margin of Qaidam Basin
祁泽学 1肖勇 2汪生斌 1张国强 1陈龙1
作者信息
- 1. 青海省环境地质重点实验室,青海西宁 810000;青海省环境地质勘查局,青海西宁 810000
- 2. 西南交通大学地球科学与环境工程学院,四川成都 611756
- 折叠
摘要
尕斯库勒湖流域所属行政区茫崖市自建市以来尚未建设较大规模的集中供水水源,在以水定产、以水定城的城市发展构架下,评价流域地下水资源及开采潜力对城市发展至关重要.文章基于资料收集、动态长观、钻孔抽水试验等手段,采用断面径流量法结合流域尺度的数值模拟,评价了区内地下水天然资源量和允许开采量,并对地下水开采后对水文环境的影响进行了评估.结果表明:尕斯库勒湖流域地下水天然资源量为98.82×104 m3/d,允许开采量为23.5×104 m3/d,地下水资源开采系数<0.4,开采程度低;开采稳定后下游泉水减少10.89×104 m3/d,蒸发量减少12.88×104 m3/d,开采量和泉水及蒸发量减少之和相等,开采地下水间接袭夺了无效蒸发和部分泉水;下游湿地区降深≤0.5 m,湿地面积不产生退化;尕斯库勒湖入湖量减少2.53×104 m3/d,能维持湖泊及湿地周围生态环境的良性循环.
Abstract
The Gasikule Lake Basin is located in Mangya City,an administrative region where large-scale centralized water source projects have not been constructed since its establishment as a city.Within the framework of basing municipal production and urban development on water resources,the evaluation of underground water resources and extraction potential is crucial.This article evaluates the natural groundwater resources and permissible extraction volume within the area,as well as assesses the impact of groundwater extraction on the hydrological environment.The assessment is based on data collection,dynamic observations,pumping tests,and numerical simulations at the basin scale,combining the cross-section radial flow method.The results indicate that the volume of natural groundwater resources in the Gasikule Lake Basin is 98.82×104 m3/d,with a permissible extraction volume of 23.5×104 m3/d.The underground water extraction coefficient is less than 0.4,signifying a low extraction level.Following stable extraction,downstream spring water decreases by 10.89×104 m3/d,while evaporation volume decreases by 12.88×104 m3/d.The total extraction volume equals the sum of the reduced volume of spring water and reduced volume caused by evaporation.Indirectly,the extraction of groundwater depletes ineffective evaporation and a portion of spring water.The depth of wetland areas decreases by≤0.5 m,without degradation of wetland area.The inflow into the Gasikule Lake decreases by 2.53×104 m3/d,but it can maintain a positive ecological cycle around the lake and wetlands.
关键词
柴达木盆地西缘/尕斯库勒湖流域/地下水允许开采量/数值模拟Key words
Western margin of Qaidam Basin/Gasikule Lake Basin/Allowable exploitation of groundwa-ter/Numerical simulation引用本文复制引用
基金项目
国家自然科学基金(42007183)
四川省自然科学基金(2022NSFSC1084)
青海省环境地质重点实验室科技项目(2023-ZK-01)
出版年
2024
NETL
NSTL
维普
万方数据