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首页> 外文期刊>Proceedings of the International Association of Hydrological Sciences >Framework for quantifying flow and sediment yield to diagnose and solve the aggradation problem of an ungauged catchment
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Framework for quantifying flow and sediment yield to diagnose and solve the aggradation problem of an ungauged catchment

机译：用于定量分析流沙量的框架，以诊断和解决无流域集水问题

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Estimating sediment deposition in a stream, a standard procedure for dealing with aggradation problem is complicated in an ungauged catchment due to the absence of necessary flow data. A serious aggradation problem within an ungauged catchment in Alabama, USA, blocked the conveyance of a bridge, reducing the clearance under the bridge from several feet to a couple of inches. A study of historical aerial imageries showed deforestation in the catchment by a significant amount over a period consistent with the first identification of the problem. To further diagnose the aggradation problem, due to the lack of any gauging stations, local rainfall, flow, and sediment measurements were attempted. However, due to the difficulty of installing an area-velocity sensor in an actively aggrading stream, the parameter transfer process for a hydrologic model was adopted to understand/estimate streamflow. Simulated discharge combined with erosion parameters of MUSLE (modified universal soil loss equation) helped in the estimation of sediment yield of the catchment. Sediment yield for the catchment showed a significant increase in recent years. A two-dimensional hydraulic model was developed at the bridge site to examine potential engineering strategies to wash sediments off and mitigate further aggradation. This study is to quantify the increase of sediment yield in an ungauged catchment due to land cover changes and other contributing factors and develop strategies and recommendations for preventing future aggradation in the vicinity of the bridge.
机译：估计河流中的沉积物，由于缺乏必要的流量数据，在未集水的集水区中，处理集水问题的标准程序非常复杂。在美国阿拉巴马州一个未开封的集水区中，严重的积水问题阻碍了桥梁的运输，使桥梁下方的间隙从几英尺减小到几英寸。一项对历史航空影像的研究表明，在与该问题的首次发现相一致的一段时间内，流域的森林砍伐量很大。为了进一步诊断凝结问题，由于缺乏任何测量站，尝试了局部降雨，流量和沉积物测量。但是，由于难以在主动积聚的河流中安装区域速度传感器，因此采用了水文模型的参数传递过程来理解/估计河流流量。模拟排放结合MUSLE（修正的通用土壤流失方程）的侵蚀参数有助于估算集水区的泥沙产量。近年来，该流域的泥沙产量显着增加。在桥梁现场开发了二维水力模型，以研究潜在的工程策略，以清除沉积物并减轻进一步的凝结。这项研究的目的是量化由于土地覆盖变化和其他影响因素而导致的流域未沉积流域的泥沙产量增加，并制定策略和建议以防止将来桥附近的沉积。

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