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Modeling Sediment Transport in the Lower American River, Sacramento, California

机译：在美国加利福尼亚萨克拉曼多的下美洲河流中模拟泥沙输送

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This study quantified sediment transport processes and geomorphic trends along the lower American River, California for evaluating impacts of the Folsom Dam Modification Project on channel morphology. The analysis used a HEC-6T sediment transport model of the 22-mile reach of the American River below Nimbus Dam and the adjoining 32-mile reach of the Sacramento River. Model geometry was based on 1997 and 2006 bathymetric surveys. Bed material characteristics in the model were specified from a surface and sub-surface sampling program and geotechnical investigations of erosion-resistant stratigraphy. The model was calibrated to measured sediment loads and bed profiles. The calibrated model was then used to simulate long-term morphological changes in the lower American River under existing and project hydrologic conditions. The model results obtained for existing conditions indicated active degradation of the American River below Nimbus Dam and predominant aggradation in the downstream reach, which is consistent with field measurements. The project condition results, which include higher flow releases through the new auxiliary spillway, indicated increased channel degradation immediately below Nimbus Dam and showed no significant changes in bed profile in reaches further downstream to the confluence with the Sacramento River.
机译：这项研究量化了加利福尼亚下游美国河沿岸的泥沙输运过程和地貌趋势，以评估Folsom大坝改造项目对河道形态的影响。该分析使用了HEC-6T泥沙输送模型，该模型采用的是Nimbus大坝以下22英里的美国河段以及萨克拉曼多河32英里的邻接段。模型几何基于1997年和2006年的测深调查。该模型中的床层材料特征是通过地面和地下采样程序以及抗腐蚀地层的岩土研究确定的。对该模型进行了校准，以测量沉积物负荷和床剖面。然后，在现有和项目水文条件下，使用校准后的模型来模拟下游美洲河流的长期形态变化。在现有条件下获得的模型结果表明，美国河流在雨云水坝以下正在积极退化，并且在下游河段主要呈团块状分布，这与现场测量结果是一致的。该项目的状况结果包括通过新的辅助溢洪道的较高流量释放，表明直接在Nimbus大坝下方的河道退化加剧，并且在与萨克拉曼多河汇合处更下游的河段中，河床剖面无明显变化。

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