Sediment regimes, i.e., the processes that recruit, transport, and store sediment, create the physical habitats that underpin river‐floodplain ecosystems. Natural and human‐induced disturbances that alter sediment regimes can have cascading effects on river and floodplain morphology, ecosystems, and a river's ability to provide ecosystem services, yet prediction of the response of sediment dynamics to disturbance is challenging. We developed the Sediment Routing and Floodplain Exchange (SeRFE) model, which is a network‐based, spatially explicit framework for modeling sediment recruitment to and subsequent transport through drainage networks. SeRFE additionally tracks the spatially and temporally variable balance between sediment supply and transport capacity. Simulations using SeRFE can account for various types of watershed disturbance and for channel‐floodplain sediment exchange. SeRFE is simple, adaptable, and can be run with widely available geospatial data and limited field data. The model is driven by real or user‐generated hydrographs, allowing the user to assess the combined effects of disturbance, channel‐floodplain interactions and particular flow scenarios on the propagation of disturbances throughout a drainage network, and the resulting impacts to reaches of interest. We tested the model in the Santa Clara River basin, Southern California, in subbasins affected by large dams and wildfire. Model results highlight the importance of hydrologic conditions on postwildfire sediment yield and illustrate the spatial extent of dam‐induced sediment deficit during a flood. SeRFE can provide contextual information on reach‐scale sediment balance conditions, sensitivity to altered sediment regimes, and potential for morphologic change for managers and practitioners working in disturbed watersheds.

中文翻译：

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泥沙路由和洪泛区交换（SeRFE）：通过河网的泥沙平衡和连通性的空间显式模型

沉积状态，即募集，运输和储存沉积物的过程，创造了支撑河漫滩生态系统的物理栖息地。改变沉积物状况的自然和人为干扰会对河流和洪泛区的形态，生态系统以及河流提供生态系统服务的能力产生连锁效应，但是预测沉积物动力学对干扰的响应却具有挑战性。我们开发了沉积物路由和洪泛区交换（SeRFE）模型，该模型是基于网络的，空间明确的框架，用于对沉积物募集和随后通过排水网络的运输进行建模。SeRFE还跟踪沉积物供应和输送能力之间的时空平衡。使用SeRFE进行的模拟可以说明各种类型的流域扰动和河道-滩涂沉积物交换。SeRFE简单，适应性强，可以与广泛使用的地理空间数据和有限的现场数据一起运行。该模型由真实的或由用户生成的水位图驱动，使用户能够评估扰动，渠道-洪泛区相互作用以及特定流量情景对扰动整个排水管网传播的综合影响，以及对感兴趣范围的最终影响。我们在受大型水坝和野火影响的子盆地中的南加州圣塔克拉拉河流域测试了该模型。模型结果突出了水文条件对野火后泥沙产量的重要性，并说明了洪水期间大坝诱发的泥沙缺乏的空间范围。