利用汇流阈值分析川中丘陵区西河水系分形特征

Analysis of the Fractal Characteristics of Xihe River Basin in Hilly Area of Central Sichuan By Using Confluence Threshold

ArcGIS建立川中丘陵区西河流域水系分析模型;基于类比量规法,通过计算汇流阈值获取对应的河(沟)谷的长度,进而得出两者的关系,来确定水系的分维特征。实验表明,提取水系较精确地确定了西河流域边界,提取水系较好吻合现实河网特征,细节更加突出。基于西河水系的多阈值实验分析,发现水系标度(汇流阈值)与长度对数关系显著,分析特征明显,其分维值为1.45。

ArcGIS establishes the river system analysis model of the Xihe River basin in the hilly area of central Sichuan.Based on the analogical gauge method,the length of the corresponding river(gully)is obtained by calculating the confluence threshold,and then the relationship between the two is obtained to determine the fractal characteristics of the water system.The experimental results show that the boundary of the Xihe River basin is accurately determined by the extracted water system,the extracted water system is better consistent with the characteristics of the real river network,and the details are more prominent.Based on the multi-threshold experimental analysis of Xihe River system,it is found that there is a significant relationship between water system scale(confluence threshold)and length logarithm,and the analysis feature is obvious,and its fractal dimension value is 1.45.