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黑河下游地下水波动带地下水时空分布模拟研究-FEFLLOW模型应用

ISSN号：1000-6060
期刊名称：干旱区地理
时间：0
页码：391-396
语言：中文
分类：P641.2[天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]中国生态系统研究网络临泽内陆河流域综合研究站,中国科学院寒区旱区环境与工程研究所,甘肃兰州730000, [2]兰州大学干旱区草地与农业教育部重点实验室,甘肃兰州730000, [3]兰州大学西部环境教育部重点实验室,甘肃兰州730000
相关基金：基金项目：国家自然科学基金项目（40671067、30770387）;中国科学院寒区旱区环境与工程研究所冰川学冻土学特殊学科点（J0630966）
相关项目：黑河下游生态需水量估算及时空分布研究

关键词：黑河下游, 波动带, 地下水, FEFLOW, 时空分布, the lower reaches of Heihe fiver, the water table fluctuant belt , groundwater, FEFLOW software , the temporal and spatial distribution

中文摘要：

从黑河下游地下水波动带水文循环出发，确定影响地下水变化的重要补给排泄项，根据水文地质结构对研究区水力传导系数和给水度进行确定，并获得研究区参数分区。通过运行FEFL—LOW模型，得到任意时段研究区地下水水头的空间分布。利用观测数据对模拟结果验证并进行参数调整。结果表明：（1）15个观测点平均误差约为0．59m，最小平均误差为0．18m，最大平均误差1．09m；（2）地下水的空间变化为以东西河为中心向两侧加深，研究区南部岩石山地和北部东西居延海之间地下水位较深，其它区域地下水位在1～4m之间；（3）从模拟初始（1990年），研究区每年水量都处于一种负均衡状态，2000年之后略有改观，2003年出现了正均衡。但不同区域地下水年际变化的趋势不同，研究区内上下游的水位有上升趋势，而中游绿洲区水位以下降趋势为主。

英文摘要：

The groundwater level plays an important role in determining the pattern and distribution of vegetations that stabilize riverine environments. Presently, models simulating distribution of groundwater level become important tools in the groundwater research field. Based on the field investigation of geology and hydrogeology, conductivity and water supply capacity of the aquifer were determined in this study. After spatializing the relative parameters inputted, FEFLLOW software was run and a series of temporal and spatial distribution maps of groundwater level were obtained. By analyzing these maps, we could draw some conclusions：（ 1 ） Comparing the estimated and measured values, the mean error was 0.54m in 31 stations with mean minimum error 0.04m and mean maximum error 1.17 m; （2） Spatially, the lowest groundwater table appeared in southern mountain and northern parts between east lake and west lake. Generally, the groundwater level is between 1 m and 4 m in the most parts of the study area. Temporally, variation of groundwater level is not significant; （3） The groundwater level has gradually descended from initial stage of simulation in the study area due to decrease of runoff form the middle reaches of Heihe River. However, the Chinese Government initiated the environmental restoration project in the Heihe River basin in 2000 with water diversions from the Zhengyi gorge reservoir to the lower reaches. From 2000 to 2002 there were 6.8 × 10^8 m3 each year has been releases to the lower reaches. The groundwater level has thus risen from 2002. However, the trend of ground level change was different in different parts. The ground level has mounted up in the upper and lower parts of the study area, but dropped in the middle part.

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