天山河谷地貌特征及其与河流产砂段关系的分析

天山河谷形态可分横向谷和纵向谷两大类,其河流长度,河谷纵坡,地貌形态各具特征。再加上新构造运动强烈程度,出露的地层岩性,大气降水和植被诸因素的差异,河流的侵蚀搬运能力迥然不同。因而致使它们的产砂地段和输砂量也大不一样。在影响因素大致相似的情况下,河谷输砂模数总的特点是:横向谷大于纵向谷;新构造运动强烈上升地段大于新构造运动较稳定地段,植被度差的地区大于植被度高的地区。

Analysis of the Relationship Between the Valley Geomorphological Features and Sand-Occuring Place in the Tianshan Mountains

The morphology of Tianshan valley may be divided into two categories: vertical valley and transverse valley, whose stream length, valley gradient, and geomorphological patterns are provided with features separatedly. Because of the different intensity of neotectonism, strata behavior exposed, atmospheric precipitation and vegetative cover, ect., the eroding transport action of streams are obviously nat the same. Therefos the sandy place and the sandy quantity caused to produce are quite different. Under the conditions of the approximately similar factors, the featrues of the transport-sand model are as follows: transverse valley is more than vertical vallex, the intensive rising place more than slow stable place of the neote ctonism, place of rare vegetative cover more than densitive place of vegetativecover.