CAJ | 학술논문

利用DEM数据提取河流地貌参数在地貌学和水文学研究中具有重要意义,其中集水面积阈值的准确确定是关键环节,然而,目前对集水面积阈值的确定存在随意性和主观性.为了探讨如何确定提取河网的最佳集水面积阈值,本文以青藏高原东缘杂谷脑河流域为例,基于SRTM-DEM数据,在利用ArcGIS水文分析模块计算不同集水面积阈值条件下河网密度参数的基础上,通过均值变点分析法获取河网密度值变化的拐点,并计算最佳集水面积阈值.研究表明：随着集水面积阈值的改变,河网密度逐渐降低,利用均值变点分析法所确定的最佳集水面积阈值为8.1 km2,该结果与1：50万水系图相比,主干上吻合,支流上更具真实性.该方法可以较好地确定最佳集水面积阈值,可为其它地区水系提取提供参考.
이용DEM수거제취하류지모삼수재지모학화수문학연구중구유중요의의,기중집수면적역치적준학학정시관건배절,연이,목전대집수면적역치적학정존재수의성화주관성.위료탐토여하학정제취하망적최가집수면적역치,본문이청장고원동연잡곡뇌하류역위례,기우SRTM-DEM수거,재이용ArcGIS수문분석모괴계산불동집수면적역치조건하하망밀도삼수적기출상,통과균치변점분석법획취하망밀도치변화적괴점,병계산최가집수면적역치.연구표명：수착집수면적역치적개변,하망밀도축점강저,이용균치변점분석법소학정적최가집수면적역치위8.1 km2,해결과여1：50만수계도상비,주간상문합,지류상경구진실성.해방법가이교호지학정최가집수면적역치,가위기타지구수계제취제공삼고.
To gain the threshold of catchment area is the critical step of extracting drainage network from DEM. But this index determination were still subjective and random with no theoretical support in most studies. Taking Zagunao Drainage Basin as an example,we calculated the drainage densities of different accumulation areas with SRTM-DEM data by using the hydrology model in Arcgis followed by gaining the optimum accumulation area with the method of mean of change-point. The result indicates that the drainage density correlated with accumulation area negatively and the 8. 1 km2 optimum accumulation shows more authenticity compared with the geology map of 1:500 000. It means that this kind of way can be applied to determine the accumulation area.