基于DEM的宁波市皎口—周公宅水库水源保护区的划区定界方法

根据宁波市水库饮用水水源地的环境现状,以宁波市皎口水库和周公宅水库为例,采用空间分辨率为5 m的数字高程模型(DEM),利用ArcGIS的水文分析模型,生成研究区流域盆地和集水流域的范围,初步划定保护区范围;同时,结合分辨率为0.5 m的航测影像以及研究区自然和社会等多种数据,最终划定研究区饮用水水源一级、二级保护区的水域和陆域范围,为饮用水水源地保护工作提供参考。

Zoning and delimitation of water source conservation areas based on DEM in Jiaokou and Zhougongzhai reservoirs in Ningbo City

Based on the current status of the drinking water sources in Ningbo City, case studies were conducted in the Jiaokou Reservoir and Zhougongzhai Reservoir for zoning and delimitation of water source conservation areas. The hydrologic model in ArcGIS and a digital elevation model （DEM） with a spatial resolution of five meters were used to generate the ranges of basins and watersheds, and the water source conservation areas were preliminarily delimited. Based on an aerial photograph with a resolution of 0. 5 m and various ancillary data, the study area was classified into first-grade and second-grade conservation zones that consist of certain water areas and land-based areas. This study provides references for protection of drinking water sources.