河流沙丘形成过程的基本特征  

Basic Characteristics in the Process of River Dune Formation

作　　者：张春生[1] 张吉来[2] 朱广社[2] 王德玉[2] 马永宁[2] 袁俊平[2] 李力[3] 

机构地区：[1]江汉石油学院地球科学系,湖北荆州434023 [2]长庆油田分公司第三采油厂,宁夏银川745100 [3]中原石油勘探局钻井三公司,河南兰考475300

出　　处：《江汉石油学院学报》2003年第3期5-7,共3页Journal of Jianghan Petroleum Institute

基　　金：国家自然科学基金(40272057D0206)

摘　　要：实验表明,河流沙丘的发展过程可以分为4个阶段:低矮沙纹的形成、大沙丘的生长、沙丘的延伸及沙丘的变形。前2个阶段属于生长沙丘时期,沙丘的长度和宽度均逐渐增大,水面出现紊乱的猝发现象,悬浮沉积物浓度比较高;后2个阶段属于平衡沙丘时期,沙丘的长度和宽度变化比较小,猝发现象较弱,悬浮沉积物浓度也比较低。It is revealed by experiments that the development of river dune is divided into 4 stages, such as forming of small bed ripples, growth of great dunes, extension of the dunes and their distortion. The first 2 stages are the periods of dune growing, of which the length and width of the dunes increase gradually, disorganized abrupt phenomena appear at water surface, concentration of suspending sediments is relatively high, the other 2 stages belong to the periods of dune balance, of which the length and width of dunes are smaller, abrupt phenomena are less, concentration of the suspending sediments is lower.

关 键 词：沙丘 河流 悬浮沉积物 物理模拟实验 

分 类 号：P343.1[天文地球—水文科学]