| 宋策,周孝德,李国栋,刘钊.泥沙异重流影响下的水库垂向水温分布预测模拟[J].水利学报,2009,40(11): |
| 泥沙异重流影响下的水库垂向水温分布预测模拟 |
| Simulation on the vertical distribution of water temperature in reservoir under the influence of sediment density current |
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| DOI： |
| 中文关键词: 泥沙异重流 刘家峡水库 水温预测模型 水库垂向水温分布 |
| 英文关键词: sediment density current Liujiaxia reservoir water temperature model water temperature vertical distribution of reservoir |
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| 中文摘要: |
| 水库水体异重流的变化是影响水库水温分布最为关键的因素之一。本文以黄河上游刘家峡水库为例，建立考虑泥沙异重流影响的三维水库水温模型，利用已有水库水温分布监测数据对模型进行验证。在考虑有无泥沙异重流影响的条件下，对水库汛期库区垂向水温分布进行预测和比较。模拟结果显示，在不考虑来流含沙时，库区垂向水温分布始终为典型分层型，按实际含沙来流计算时，库区垂向水温分布随着水沙量增大而呈现从分层型转化为混合型分布的变化，泥沙异重流是造成夏季水库水温成混合型的主要原因，只有考虑泥沙异重流的影响才能正确预测多沙河流上水库水温的变化规律。 |
| 英文摘要: |
| Change of density current is one of key factors that affect the distribution of water temperature in reservoir. Generally, simulations of water temperature distribution just involve the temperature density current under the clear water condition, but the effect of sediment density current can not be neglected in a turbid water reservoir. In this paper, we took Liujiaxia reservoir on the upstream of Yellow River as an example, and used three_dimensional model to simulate the distribution of water temperature in reservoir with sediment density current effect. Then the model is verified by means of measured temperature data. The vertical temperature distribution in reservoir is predicted and compared with the observation data during the flood season. The result shows that the vertical temperature distribution in a reservoir is always typically stratified type when inflow does not contain sediment, while it presents a change from stratified type translated into mixed type according to a actual calculation of inflow with sediment. In other words, sediment density current is a main reason causing mix of water temperature of reservoir in summer. Only take into account the effect of sediment density current, the change of water temperature of reservoir in sandy river can be predicted correctly. |
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