【作者】 安全； 贺中华； 梁虹； 杨朝晖； 曾信波；

【Author】 AN Quan;HE Zhong-hua;LIANG Hong;YANG Chao-hui;ZENG Xin-bo;School of Geography and Environmental Science,Guizhou Normal University;School of Geography and Environmental Science,Guizhou Normal University/State Engineering Technology Institute For Desertification Control;Water Resources Department of Guizhou Province;

【机构】 贵州师范大学地理与环境科学学院； 贵州师范大学地理与环境科学学院/国家喀斯特石漠化防治工程技术研究中心； 贵州省水利厅；

【摘要】 以黔中水利枢纽工程区为研究对象,改进的ASTER-GDEM基础数据源,探讨在无大比例尺水系图参照下利用ArcGIS10.2的水文分析技术提取喀斯特分布区地表水系及其合理汇流阈值问题。结果表明:①汇流累积量阈值的大小是决定河网密度的关键因子,阈值由小到大变化过程中河网密度的变化呈现出先快速降低然后渐缓的趋势即河流的数量随着汇流累积量阈值门槛的升高而减少。②分析汇流累积量与河网密度、河流总条数、河道总长之间的关系及其斜率变化发现汇流累积阈值10000是一个变点。阈值10000以下河网密度、河流总条数、河道总长变化剧烈,以上变化趋缓。③取汇流阈值10000提取的水系叠加在Google earth高分辨率遥感影像上以及与研究区互相独立的横江流域进行验证,结果发现该阈值下的水系基本与现状河流吻合。更多还原

【Abstract】 Taking the Guizhou central water conservancy project area as the research object,the improved ASTER-GDEM and high spatial resolution Google earth high-definition remote sensing images and online maps and regional scale water system maps are used to discuss the extraction of Karst’s Cross basin surface water using the ArcGIS10.2 hydrologic analysis technology under the reference of no large scale water system map.The problem of the system and its verification method.The results show mat:① the size of the accumulation threshold value is the key factor to determine the density of the river network,and the change of the density of the river network in the process of the threshold change from small to large shows a rapid decrease and gradually decreasing trend,mat is,the number of rivers decreases with the increase of threshold threshold of the confluence accumulation.② the analysis of the relationship between the accumulation of confluence and the density of the river network and its slope change found mat the best accumulation threshold of 10000 was obtained in the study area of the project of the central Guizhou water conservancy project Under the threshold of 10000,the density of the river network changed dramatically,and the above changes slowed down slightly.③ the water system extracted from the threshold of 10000 is superimposed on the Google earth high resolution remote sensing image,and the results show that the water system under this threshold is basically consistent with the current river.更多还原