湖库型饮用水源地流域特征提取

以重庆市梁平县沙坝水库饮用水源为研究对象,利用ArcGIS水文分析模块,对水源地流域的河网进行提取和子流域划分.结果表明:选用集水面积阈值为3 000时提取的河网与实际水系分布最相近,在此基础上共划分得到13个子流域.通过对13个子流域土地利用情况的分析,发现人类活动影响主要集中在水库周边的1～5号子流域,尤其是1号子...

Acquisition of Basin Characteristics of Drinking Water Sources in Lake Reservoirs

Taking Shaba Reservoir of Liangping in Chongqing as research object and use the ArcGIS hydrologic analysis model,the sub-watershed after the procedure is divided and the data of the river network basin are collected and analyzed.The analysis results indicate that when the drainage area threshold amounts to 3000,the extracting river net is most close to the actual distribution of water system.On the basis of this relationship,13 sub-basins are divided.Moreover,according to analysis on conditions of land use,it is suggested that No.1~5 sub-watersheds around the reservoir are disturbed by human's activities,especially No.1 sub-watershed,which needs countermeasures to recover.The characteristics derived from the extraction of the lake type water source provide convenience for the management of watershed grading and recovering,and provide a basis for environment protection of the drinking water source watershed at the same time.