云南龙川江流域地貌形态特征研究  

A Study on Geomorphic Characteristics of the Longchuan River Basin in Yunnan

作　　者：罗大游 温兴平[1,2] 张皓楠 李进波 郁智 Luo Dayou;Wen Xingping;Zhang Haonan;Li Jinbo;Yu Zhi(Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093;Yunnan Provincial Laboratory of Mineral Resources Prediction and Evaluation Engineering, Kunming 650093)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]云南省矿产资源预测评价工程实验室,昆明650093

出　　处：《上海环境科学》2018年第1期17-20,44,共5页Shanghai Environmental Sciences

基　　金：国家自然科学基金(编号:41101343)资助

摘　　要：以云南省龙川江流域为例,研究了流域内局部与整体的地貌形态特征,并预测了径流发育发展趋势。以ASTER-GDEM数据为基础,ArcGIS水文分析模块为平台,自动提取不同汇流累积量下的水系河网,研究区先划分为若干区块,结合分形理论,运用数盒子法计算水系分形维数划分流域侵蚀阶段。研究发现,在一定无标度区间内,研究区内具有自相似性,分形维数与汇流累积量拟合较好;通过分维数与汇流累积量关系式二阶导数求拐点的方法确定流域的适宜阈值为16667,对应的流域整体水系分维数为1.0203,推断出流域处于地貌侵蚀幼年阶段,并向幼年晚期发展,此时流域内地面起伏较大、将越来越支离破碎;通过计算各区块维数生成的等值线图,预测径流主要以NE-SW向发育,同时呈NW-SE向次级发育。Taking the Longchuan River Basin in Yunnan Province as an example,its localised and entire geomorphic characteristics were studied,and the development trend of runoff was forecasted.On the basis of ASTER-GDEM data and using the ArcGIS hydrological analysis module as a platform,the river network systems under different cumulative volumes of impounded water were automatically extracted.The study area was first divided into several blocks,and combining the fractal theory and using the box counting method,fractal dimensions of the water system were calculated to divide the basin erosion stages.It has been found that within certain scaleless range,there was a self-similarity within the study area whilst the fractal dimensions and runoff impounding accumulation were rather well fitted.Through a method by using second order derivative of the relationship between fractal dimensions and runoff impounding accumulation to seek the inflection point,a suitable threshold value of the watershed was determined as16,667,and the corresponding fractal dimensions of the whole basin was1.020,3.It was inferred that the basin could be at the juvenile phase of geomorphic erosion whilst developing to its late stage.At this moment,it would have rather undulating topography within the basin and was going to become increasingly fragmented.Through a contour map generated by calculating dimensions of individual blocks,the runoff was predicted to be developing mainly along the bearing of NE-SW,meanwhile along the NW-SE secondarily.

关 键 词：地貌形态特征 ARCGIS 汇流累积量 分形维数 流域生态治理 预测 

分 类 号：P931.1[天文地球—自然地理学]