The response of subaqueous dunes to floods in sand and gravel bed reaches of the Dutch Rhine
The response of subaqueous dunes to floods in sand and gravel bed reaches of the Dutch Rhine
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DOI：
10.1046/j.1365-3091.2003.00585.x
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发表时间：
2003-12
期刊：
影响因子：
3.5
通讯作者：
A. Wilbers;W. ten Brinke
中科院分区：
文献类型：
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作者：
A. Wilbers;W. ten Brinke
荷兰莱茵河支流上游为沙砾河床，下游为沙河床，在洪水期间沙丘迁移尤为明显。在过去的20年中，人们对这些沙丘进行了广泛的研究。在几次洪水期间，用单波束和多波束设备对这些沙丘进行了高分辨率回声测量，并对莱茵河系统的三个不同部分进行了分析。这一分析是为了量化洪水期间沙丘的生长、衰减和迁移速度。此外，在沙丘跟踪的基础上，利用迁移沙丘计算河床输沙率。在不同的洪涝期，不同断面的沙丘生长衰减结果和迁移速率差异很大，这种差异与河床粒度的差异以及主河道和漫滩上流量分布的差异有关。利用这一关系式表明，沙丘的生长和迁移速率以及计算出的洪水上升阶段的河床输沙速率可以用简单的幂函数关系来预测。
Abstract The branches of the River Rhine in the Netherlands, characterized by a sand–gravel bed in the upstream part and a sand bed in the downstream part of the river system, show migrating dunes, especially during floods. In the last 20 years, these dunes have been studied extensively. High‐resolution echo‐sounding measurements of these dunes, made with single and multibeam equipment, were analysed for three different sections of the Rhine river system during several floods. This analysis was done to quantify the growth, decay and migration rates of the dunes during floods. In addition, the migrating dunes were used to calculate bedload transport rates with dune tracking. The results of dune growth and decay and migration rate are shown to be very different for the various sections during the various floods, and these differences are related to differences in grain size of the bed and to differences in the distribution of discharge over the main channel and the floodplain. The relations are used to show that the growth and migration rate of dunes, and the calculated bedload transport rates during the rising stage of a flood wave can be predicted from the mobility of the bed material with simple power relations.