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首页> 外文期刊>Journal of Agricultural Engineering >A 2D hydrodynamic-sedimentological model for gravel bed rivers. Part II, Case study: the Brenta River in Italy
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A 2D hydrodynamic-sedimentological model for gravel bed rivers. Part II, Case study: the Brenta River in Italy

机译：砾石床河流的二维水动力-沉积学模型。第二部分，案例研究：意大利的布伦塔河

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摘要

A 2D depth average model has been used to simulate water and sediment flow in the Brenta River so as to interpret channel changes and to assess model predictive capabilities. The Brenta River is a gravel bed river located in Northern Italy. The study reach is 1400 long and has a mean slope of 0.0056. High resolution digital terrain models has been produced combining laser imaging detection and ranging data with colour bathymetry techniques. Extensive field sedimentological surveys have been also carried out for surface and subsurface material. The data were loaded in the model and the passage of a high intense flood (R.I. > 9 years) was simulated. The model was run under the hypothesis of a substantial equilibrium between sediment input and transport capacity. In this way, the model results were considered as a reference condition, and the potential trend of the reach was assessed. Low-frequency floods (R.I. ? 1.5 years) are expected to produce negligible changes in the channel while high floods may focalize erosion on banks instead than on channel bed. Furthermore, the model predicts well the location of erosion and siltation areas and the results promote its application to other reaches of the Brenta River in order to assess their stability and medium-term evolution.
机译：二维深度平均模型已用于模拟布伦塔河中的水和泥沙流量，以解释河道变化并评估模型的预测能力。布伦塔河是位于意大利北部的碎石河床。研究范围为1400长，平均斜率为0.0056。结合了数字测深技术，已经产生了高分辨率的数字地形模型，将激光成像检测和测距数据相结合。还对表层和地下材料进行了广泛的野外沉积学调查。将数据加载到模型中，并模拟了一次高强度洪水（R.I.> 9年）的经过。该模型是在泥沙输入量和输水能力之间达到基本平衡的假设下运行的。这样，将模型结果视为参考条件，并评估了潜在的趋势。低频洪水（R.I.为1.5年）预计将在河道中产生微不足道的变化，而高洪水则可能将侵蚀集中在河岸而不是河床上。此外，该模型可以很好地预测侵蚀和淤积区域的位置，其结果促进了其在布伦塔河其他河段的应用，以评估其稳定性和中期演变。

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