赣江入湖三角洲上的网状河流体系研究  

Study of the Anastomosing Fluvial System on the Delta Plain of the Ganjiang River

作　　者：王随继[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101

出　　处：《地理科学》2002年第2期202-207,共6页Scientia Geographica Sinica

基　　金：国家自然科学基金项目 (批准号 :40 10 10 0 3 );中国科学院地理科学与资源研究所知识创新工程领域前沿项目

摘　　要：中国南方的冲积河流有许多属于分汊河流 ,这已被许多研究者进行过比较深入的分析研究 ,但赣江在其入湖三角洲上的多河道体系与分汊河流有着明显的不同 ,它的形成是河流自发调整的结果 ,而不象分汊河流那样由节点控制。它具有网状河流所具有的地貌和沉积物特征 ,属于典型的网状河流体系。虽然是低含沙河流 ,但由于其水动力较弱及汛期基准面的上升 ,洪泛频繁 ,可输入河间地以大量的泥沙并在低能环境中发生沉积 ,使河道及河间地能够协调加积升高 ,并维持多河道体系的稳定性。Many fluvial rivers in southern China are anabranched river pattern and most of them have been studied. But the multiple channel fluvial system on the delta plain of the Ganjiang River differs from the anabranched river pattern. The multiple channel system formed spontaneously. It was not controlled by rocky or man made nodes whereas the anabranched river was. The multiple channel system belongs to anastomosing fluvial pattern because it has the basic characteristics of anastomosing fluvial pattern in geomorphology and sedimentology such as the small channel width/depth ratio, low channel gradient, cohesive fine graind levees, interchannel wetlands and floodplains, etc. Although the Ganjiang River has low concentration of sediment, its flood plains or interchannel lands have similar sedimentary rate to that of the channels due to the import and aggradation of suspended sediment carrying by the frequent overbank flow during flood periods. The fine grain sediment of the levees that has high cohesive intensity maintains the channel stability.

关 键 词：网状河流 地貌特征 沉积环境 沉积相 赣江 分汊河流 

分 类 号：P931.1[天文地球—自然地理学] P512.2