%0 Journal Article
%T Characteristics of Stream Network Structure in Relation to Geomorphologic Features in the Upper Stream Area of Dongjiang River<br>东江上游地貌特征与水系结构关系分析
%A ZHANG Jianfeng
%A WU Yongqiu
%A PAN Meihui
%A JIANG Yuan
%A KANG Muyi
%A <br>张健枫
%A 伍永秋
%A 潘美慧
%A 江源
%A 康慕谊
%J 资源科学
%D 2013
%I 
%X Using GIS tools and combining high resolution DEM data (pixel resolution at 15m) with regional geomorphologic and river system maps (scales 1:100 0000 and 1:25 0000), the relationship between the characteristics of stream network structure and regional geomorphologic features in the upper stream area of the Dongjiang River basin are analyzed. Geomorphic features such as elevation, gradient and relief amplitude were used. By using the Strahler stream order method with our improved approach to extracting river networks, we developed a 10-order stream network structure for the area. Stream network structure variables such as stream length, stream length ratio, drainage density, bifurcation ratio, stream frequency and gradient ratio were used to show characteristics of the stream network structure. We found that geomorphic types of the upper stream area in Dongjiang River basin consist of rolling hills and undulated low mountains, ranging mainly between 200m and 500m in elevation, with maximum gradient below 8°. The divided 10-level stream network structure contains 33.81×104 brooks, rivulets and rivers, stretching a total length of 8.12×104km. The stream network structure in the area has some unique features characterized by a drainage density of 5.29 km/km2, a stream frequency of 22/km2, and an average bifurcation ratio of 3.86. The area-altitude curve integral reaches to 0.23, implying the area phasing into the old age in geomorphic development stage. Soil erosion is light in the area as a whole, with a few exceptions of strong erosion on some steep slopes. The Xinfengjiang reservoir, Lijiang River and Chuantanghe River are subject to heavier human disturbances and unfavorable geomorphic backgrounds and are therefore comparatively more fragile than other sub-watersheds in our focal area.
%K Upper stream area of Dongjiang River Basin
%K Geomorphic feature
%K Stream network structure
%K River ecosystem<br>东江上游
%K 地貌特征
%K 水系结构
%K 水生态
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=9DEEAF23637E6E9539AD99BE6ABAB2B3&aid=D096FE55569F2801388C09A568D7221C&yid=FF7AA908D58E97FA&vid=6209D9E8050195F5&iid=38B194292C032A66&sid=C4490A71BEB872FA&eid=9B1D77939DDB4B89&journal_id=1007-7588&journal_name=资源科学&referenced_num=0&reference_num=28