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The upstream Dam has affected the physical, biological and cultural resources of the river downstream. One of the impacts to downstream physical environment for the aquatic ecosystem is the transformation of water temperature, owing to releases from the upstream reservoir. Temperature is one of the most influential environmental factors affecting irrigation, the growth of fishes and other Species. Adaptive Management Program has considered modifications to release flow and release temperature to increase downstream temperatures. Here, considered the aim river, Zaoshi River, is a wide-Shallow one, we applied one-dimensional combined model of Hydrodynamic (HD) and Advection-Dispersion (AD) to simulate monthly average temperature from the Zaoshi Dam to 17 km downstream. The HD model is based on one-dimensional equation of Saint-venant, the AD model on heat-exchange equation, and the parameters in the combined model need to be determined. In this research, firstly studied many papers, we obtain the main ones from many factors, which is the release volumes and temperature, air temperature, light duration, and relative humidity. Secondly, input the data of the above five items and measured temperature from April 2008 to March 2009 to calibrate the model parameters, and then used the data from April 2009 to March 2010 to check the model built. Compared to measured temperature value, the average relative errors is less than 10%, so the combined model could simulate the water temperature of Zaoshi River very well. In the last, we used the combined model to simulate the water temperature from Apr 2010 to Mar 2011. For Zaoshi the surface water level was affected by the upstream releases and downstream reservoir water level boundary, the temperature of the river was affected by the release mostly. The cause of this result may be the small capacity of the stream for heat storage. So we could change the management of Zaoshi Station to let the temperature satisfy all need of kinds. The modeling approach used here may also prove useful for other systems, particularly the wide-Shallow river below large dams where the capacity of the downstream is not large.

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Simulation of the River Water Temperature by Using One-Dimensional Combined Model of Hydrodynamic and Advection-Dispersion

  • 会议论文

  • 发表日期：

    2025年

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  • Rongxiang Hu

摘要

The upstream Dam has affected the physical, biological and cultural resources of the river downstream. One of the impacts to downstream physical environment for the aquatic ecosystem is the transformation of water temperature, owing to releases from the upstream reservoir. Temperature is one of the most influential environmental factors affecting irrigation, the growth of fishes and other Species. Adaptive Management Program has considered modifications to release flow and release temperature to increase downstream temperatures. Here, considered the aim river, Zaoshi River, is a wide-Shallow one, we applied one-dimensional combined model of Hydrodynamic (HD) and Advection-Dispersion (AD) to simulate monthly average temperature from the Zaoshi Dam to 17 km downstream. The HD model is based on one-dimensional equation of Saint-venant, the AD model on heat-exchange equation, and the parameters in the combined model need to be determined. In this research, firstly studied many papers, we obtain the main ones from many factors, which is the release volumes and temperature, air temperature, light duration, and relative humidity. Secondly, input the data of the above five items and measured temperature from April 2008 to March 2009 to calibrate the model parameters, and then used the data from April 2009 to March 2010 to check the model built. Compared to measured temperature value, the average relative errors is less than 10%, so the combined model could simulate the water temperature of Zaoshi River very well. In the last, we used the combined model to simulate the water temperature from Apr 2010 to Mar 2011. For Zaoshi the surface water level was affected by the upstream releases and downstream reservoir water level boundary, the temperature of the river was affected by the release mostly. The cause of this result may be the small capacity of the stream for heat storage. So we could change the management of Zaoshi Station to let the temperature satisfy all need of kinds. The modeling approach used here may also prove useful for other systems, particularly the wide-Shallow river below large dams where the capacity of the downstream is not large.