【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。更多还原

【Abstract】 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.更多还原