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Numerical simulation of the influence of a Red River flood on circulation and contaminant dispersion in Lake Winnipeg

机译：红河洪水对温尼伯湖环流和污染物扩散影响的数值模拟

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摘要

The Red River valley experienced one of the worst floods in 1997 because of above average snow accumulation, a blizzard during the snowmelt period and high soil moisture conditions. A three-dimensional hydrodynamic modeling system is used to study the impact of the flood on the circulation and contaminant dispersion in Lake Winnipeg. To assess the model performance, we first simulate the circulation and temperature distribution of the lake in 2007 and compare the model results with the observations made in the lake during this period. The model showed considerable skill in reproducing the thermal structure, currents and water levels. The accuracy of these simulations suggests that the model is capable of describing flow and transport of material required for detailed water quality simulations during the flood. During the flood event, Red River plume movement is primarily controlled by the wind-driven currents. The winds from the north confined the plume to a small area near the river mouth.
机译：由于积雪高于平均水平，融雪期间出现暴风雪和土壤湿度高，红河谷地区是1997年最严重的洪灾之一。使用三维水动力建模系统来研究洪水对温尼伯湖的环流和污染物扩散的影响。为了评估模型的性能，我们首先模拟了2007年湖泊的环流和温度分布，并将模型结果与该时期在湖泊中的观测结果进行了比较。该模型在再现热结构，电流和水位方面显示出相当大的技能。这些模拟的准确性表明，该模型能够描述洪水期间详细水质模拟所需的材料的流动和运输。在洪水事件中，红河的羽流运动主要受风力驱动。北方的风将烟羽限制在河口附近的一小部分。

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