基于生态约束模拟评价浩勒报吉水源地的地下水可开采量  

Simulation and assessment on allowable groundwater exploitation in the Haolebaoji well field based on ecological constraint

作　　者：李若怡 王旭升[1] 尹立河[2] 张俊[2] 王晓勇[2] Li Ruoyi;Wang Xusheng;Yin Lihe;Zhang Jun;Wang Xiaoyong(School of Water Resources&Environment,China Unizersity of Geosciences,Beijing 100083,China;Xian Center of Geological Survey,China Geological Survey,Xi'an 710054,China)

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]中国地质调查局西安地质调查中心,西安710054

出　　处：《工程勘察》2021年第3期36-42,78,共8页Geotechnical Investigation & Surveying

基　　金：中国地质调查局水工环地质调查项目(121201011000150020);国家自然科学基金面上项目(NO.41772249)。

摘　　要：浩勒报吉水源地位于内蒙古自治区鄂尔多斯市,通过集中开采白垩系砂岩地下水用于给工业项目供水。大规模开采地下水若干年后,周边出现了湖泊萎缩、乔木枯萎现象,对生态环境产生了不利影响,水源地因此被关闭。本文考虑植被、湖泊的生态保护目标对地下水位降深进行约束,建立区域尺度三维地下水流模型,重新评价了水源地的可开采资源量,优化了群井开采布局方案。根据生态水文地质调查分析,确定湖泊生态保证率应达到80%、植被生态保证率应达到80%~90%。模拟结果表明,浩勒报吉水源地的可开采量应为2.7万m^(3)/d,在当地民井的用水需求之外,可供工业用水集中开采的地下水量为2.1万m^(3)/d,低于以往的评价值。The Haolebaoji well field locates in Ordos City of Inner Mongolia,and the groundwater in the Cretaceous sandstones was heavily extracted for the supplying water of industrial projects. The lakes and forests around the well field have suffered the negative impacts in the ecological environments owing to the massive groundwater pumping. The restriction on groundwater drawdown is introduced on the basis of the ecological protection goals for vegetation and lakes. A new assessment on the allowable groundwater withdrawal with a three-dimensional model of groundwater flow in this region has carried out,and the pattern of pumping rates among well groups has also optimized. According to the survey and analysis on ecological hydrogeology conditions,the ecological retention rate should reach 80% for lakes and 80% ~90% for vegetation respectively. The modeling results show that the maximum pumping rate is 2. 7 ×10^(4) m^(3)/d. In considering of the local domestic demand,the allowable groundwater withdrawal for industrial exploitation is 2. 1×10^(4) m^(3)/d,which is lower than that before.

关 键 词：地下水资源 植被盖度 湖泊面积 数值模拟 鄂尔多斯高原 

分 类 号：P641.8[天文地球—地质矿产勘探]