This paper introduces a new high temporal resolution suspended sediment routing model that integrates fine sediment deposition and re-entrainment processes of individual size fractions with suspended sediment transport throughout the river network. This multi-size fraction model provides unique insights into the effects of sediment size classes on key sediment attributes, including suspended sediment size distribution and total concentration, sediment load, and changes in riverbed deposited fine sediment throughout the river network. Data from three high-frequency flow and sediment monitoring sites on the Manawatū River, New Zealand, were used to test the model. After calibrating the model using data from one flood event, it showed good agreement between observed and modelled fine sediment concentration and event load for five subsequent test events. When coupled with catchment erosion predictions, this new sediment routing model should provide valuable information on sediment sources and connectivity within catchments for informing catchment management.

中文翻译：

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用于沿河网路由悬浮沉积物的平流-分散模型


本文介绍了一种新的高时间分辨率悬浮沉积物路由模型，该模型将细小沉积物沉积和单个尺寸部分的再夹带过程与整个河流网络中的悬浮沉积物运输集成在一起。这种多尺寸馏分模型提供了关于沉积物大小类别对关键沉积物属性影响的独特见解，包括悬浮沉积物尺寸分布和总浓度、沉积物负荷以及整个河流网络中河床沉积细沉积物的变化。来自新西兰玛纳瓦图河上三个高频流量和沉积物监测点的数据用于测试该模型。在使用一次洪水事件的数据校准模型后，它表明观测和建模的细沉积物浓度与后续五次测试事件的事件负荷之间具有良好的一致性。当与流域侵蚀预测相结合时，这种新的沉积物路线模型应提供有关流域内沉积物来源和连通性的宝贵信息，以便为流域管理提供信息。