Local river interventions, such as channel narrowing or side channels, are often necessary to maintain safety, ecology, or navigation. Such interventions have different effects on the river's bed morphology during periods of high‐ and low‐discharge events. Mapping the bed‐level variations for different discharge levels and understanding these effects can provide new opportunities for the design of interventions in multifunctional rivers. At any moment, the local bed level in a river is composed of bed‐level changes that occur at various spatial and temporal scales. These changes consist of bed aggradation/degradation trends on a large scale, on an intermediate scale bed‐level variations as a result of discharge fluctuations, and on small‐scale moving river bed forms like dunes. Using the river Waal in the Netherlands as a case study, we analyze the intermediate‐term bed‐level changes resulting from discharge fluctuations (dynamic component) and propose adaptations to the design of floodplain interventions such that possible negative impact on the local bed‐level changes is minimized. Time series of bed levels along two 10 km stretches of the case study are considered for a period of 16 years (2005–2020). Using a wavelet transform, we isolate bed‐level variations resulting from discharge events. These bed‐level variations are presented based on the magnitude of the discharge event and are compiled in an interactive atlas of river morphodynamics, allowing us to mitigate the impact of interventions. This will help river managers in the design of interventions and lead to improved management, operation, and maintenance of multifunctional rivers.

中文翻译：

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分析自然床位动态以减轻河流干预的形态影响

当地的河流干预措施，例如河道变窄或侧河道，通常是维持安全、生态或航行所必需的。在高流量和低流量事件期间，此类干预措施对河床形态有不同的影响。绘制不同流量水平的床位变化图并了解这些影响可以为多功能河流干预措施的设计提供新的机会。在任何时刻，河流中的局部床位都是由在不同空间和时间尺度上发生的床位变化组成的。这些变化包括大范围的河床加积/退化趋势、流量波动导致的中等规模的河床水位变化以及沙丘等小规模的移动河床形态。以荷兰瓦尔河为案例研究，我们分析了流量波动（动态成分）引起的中期床位变化，并提出了对洪泛区干预措施设计的调整，以便可能对当地床位产生负面影响变化被最小化。案例研究中两条 10 公里延伸段的床位时间序列考虑了 16 年（2005 年至 2020 年）的时间序列。使用小波变换，我们隔离了放电事件引起的床位变化。这些床位变化是根据排放事件的强度来呈现的，并被汇编在河流形态动力学的交互式地图集中，使我们能够减轻干预措施的影响。这将有助于河流管理者设计干预措施，并改善多功能河流的管理、运营和维护。