Alterra Wageningen University and Research Centre, Wageningen, The Netherlands.
Ambio. 2011 Jun;40(4):370-6. doi: 10.1007/s13280-010-0120-6.
Here, we show for one of the Dutch Rhine River branches that large-scale riverine ecosystem rehabilitation and related vegetation succession may lead to up to 0.6 m higher river flood levels, because of increased hydraulic roughness. We hydraulically modeled future succession stages of embanked floodplain vegetation, following from present ecosystem rehabilitation plans for the 124-km-long river IJssel, and found flood levels exceeding the safety levels (related to dike heights). Our models take into account river engineering measures that are presently carried out, aimed at enhancing the river discharge capacity in order to meet required safety standards. Our study shows that there is a pressing need for integrated hydraulic-ecological evaluation of river engineering measures and ecosystem rehabilitation plans in the Rhine embanked floodplains. An important conclusion also is that hydraulic evaluation of planned vegetation goals only is inadequate, because flow resistance of preceding succession stages may be higher.
在这里，我们以荷兰莱茵河的一条支流为例，表明大规模的河流生态系统恢复以及相关的植被演替可能会导致高达 0.6 米的河洪水位上升，这是因为水力粗糙度增加了。我们对未来受堤岸保护的洪泛区植被的演替阶段进行了水力模拟，这是根据目前对 124 公里长的 IJssel 河的生态系统恢复计划进行的，结果发现洪水位超过了安全水平（与堤坝高度有关）。我们的模型考虑了目前正在进行的河流工程措施，旨在提高河流的排放能力，以满足所需的安全标准。我们的研究表明，迫切需要对莱茵河受堤保护的洪泛区的河流工程措施和生态系统恢复计划进行综合水力-生态评估。一个重要的结论还表明，仅对计划植被目标进行水力评估是不够的，因为前序演替阶段的水流阻力可能更高。
