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首页> 外文期刊>Frontiers of earth science >Numerical simulation of the impacts of water level variation on water age in Dahuofang Reservoir
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Numerical simulation of the impacts of water level variation on water age in Dahuofang Reservoir

机译：大伙房水库水位变化对水龄影响的数值模拟

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The transport timescales were investigated in response to water level variation under different constant flow rates in Dahuofang Reservoir. The concept of water age was applied to quantify the transport timescales. A three-dimensional hydrodynamic model was developed based on the Environmental Fluid Dynamics Code (EFDC). The model was calibrated for water surface elevation and temperature profiles from April 1, 2008 to October 31, 2008. Comparisons of observed and modeled data showed that the model reproduced the water level fluctuation and thermal stratification during warm season and vertical mixing during cold season fairly well. The calibrated model was then applied to investigate the response of water age to water level changes in Dahuofang Reservoir. Model results showed that water age increases from confluence toward dam zone. In the vertical direction, the water age is relatively uniform at upstream and stratifies further downstream, with a larger value at bottom layer than at surface layer. Comparisons demonstrated that water level variation has a significant impact on transport timescales in the reservoir. The impact of water level drawdown on water age is stronger at bottom layer than at surface layer. Under high flow conditions, the water age decreases 0-20 days at surface layer and 15-25 days at bottom layer. Under mean flow conditions, the water age decreases 20-30 days at surface layer and 30-50 days at bottom layer. Furthermore, the impact is minor in the upstream and increases further downstream. The vertical stratification of water age weakens as the water level decreases. This study provides a numerical tool to quantify the transport timescale in Dahuofang Reservoir and supports adaptive management of regional water resources by local authorities.
机译：研究了大伙房水库不同恒定流量下响应水位变化的运输时标。水龄的概念被用于量化运输时间尺度。基于环境流体动力学规范（EFDC）开发了三维流体动力学模型。从2008年4月1日至2008年10月31日，对模型进行了水面高度和温度剖面的校准。对观测数据和模型数据的比较表明，该模型再现了温暖季节的水位波动和热分层以及寒冷季节的垂直混合。好。然后，使用校准后的模型研究大伙房水库水龄对水位变化的响应。模型结果表明，水年龄从汇合处向坝区增加。在垂直方向上，水年龄在上游相对均匀，并在下游进一步分层，底层的水年龄大于表层的水年龄。比较表明，水位变化对储层的运输时间尺度有重大影响。底层水位下降对水龄的影响比表层强。在高流量条件下，水年龄在表层下降0-20天，在底层下降15-25天。在平均流量条件下，表层的水龄减少20-30天，底层的水龄减少30-50天。此外，影响在上游较小，而在下游进一步增加。随着水位的降低，水龄的垂直分层减弱。这项研究提供了一个数值工具来量化大伙房水库的运输时间尺度，并支持地方当局对区域水资源的适应性管理。

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