涟江源区河流地貌特征及其与构造的响应

Geomorphic Features and It's Response to Structure of the River in the Lianjiang Water Source Area

通过对涟江源区河流地貌及地质构造的调查发现,区内河谷地貌平面展布形式有纵谷、横谷及斜向谷,纵断面形态主要为"V"型、次之为"U"型。支流与干流交汇处发育三处盆地,各盆地中均发育三级阶地,分别形成于距今56.7±3.6 Ka,24.2±2.4 Ka,0.8±0.250 Ka。区内河谷地貌、阶地特征与新构造运动地壳间歇性抬升关系密切,水系发育严格受到活动性断层、大型节理、岩层产状的控制。由于新构造运动使得东南面高坡场地区的地势迅速抬升,致使小马场河的溯源侵蚀加强,为涟江河主干供应了大量的物质来源,从而成为涟江河的主要物源区。

By investigating the geomorphic and geologic features of the rivers in the Lianjiang water source area,it＇s known that the valley landform planar distribution in this area are longitudinal valley,latitudinal valley and oblique valley,the longitudinal section mainly are V shape and U shape.There are three basins in the joint of tributary and the master river,each basin developed three classes of terrace,have formed since 56.7±3.6Ka,24.2±2.4Ka and 0.8±0.250Ka.The valley landform,terrace feature has deep relation with crust intermittent lift of neotectonic movement,the water system is controlled by active fault,big joint and stratum occurrence strictly.Because the neotectonic movement makes the land of Gaopochang area lifted quickly,causes the source erosion of Xiaomachang river stronger,affords abundant material source for the Lianjiang master river,so it becomes the main material source area.