Modeling the Effects on the River Morphology of Lowering Groins in the Netherlands
The Room for the River (RvdR) program in the Netherlands states that the conveyance capacity for the Rhine River should be enlarged and that dike reinforcements should be kept to a minimum in the future. Many measures have been set forth to create more space in the riverbed. One of those measures is lowering the groins of the Midden-Waal River, one of the branches of the Rhine River in the Netherlands. This will result in a reduction of the water level during floods conditions. Groins are used for fixation of the main channel and to improve nautical depths. As a result of lowering the groins, discharges through the main channel will be reduced, which in turn results in sediment being deposited in the main channel. In order to evaluate the morphological effect of lowering the groins and subsequent dredging activities, the advanced morphological model Delft3D is applied. The pseudo-3D morphological model of the Rhine system in the Netherlands was developed as part of the Duurzame Vaardiepte Rijndelta (DVR) ( Sustainable Navigation Depth for the Rhine Delta)program. This DVR model contains all kinds of innovative, recently developed aspects, including domain decomposition, sediment transport over non-erodible layers and a functionality for sediment management to assess dredging and dumping strategies. The model can be used to assess the long-term large-scale evolution of the Rhine branches as well as time-dependent cross-sectional evolution by alternate bars and curvature-induced bar-pool patterns in bends. The results show the ability of the model to predict future dredge and dump activities in the Waal River, offering answers to river managers. Furthermore, the model is a useful tool in optimizing groin heights to reduce both water levels during extreme floods and morphological negative side effects.
River morphology groins numerical modeling sediment management
M. M. Busnelli C. J. Sloff A. Sieben
DHV Inc. , the Netherlands Deltares, the Netherlands Ministry of Transport, Public Works and Water Management, the Netherlands
国际会议
郑州
英文
1336-1343
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）