参数率定方案对水温数值模拟结果的影响

Effects of parameter calibration schemes on numerical simulation results of water temperature

建立了立面二维水动力-水温模型,运用建库前天然河道及邻近区域同类型水库两组不同实测资料对模型进行参数率定。根据这两组计算参数分别模拟了验证时段内D水库水温分布,以及A水库库区水温变化过程。数值模拟结果表明,在其他条件保持一致的情况下,天然河道及邻近区域同类型水库资料均可用于数值模拟参数的率定,将两组验证参数用于实际计算时,所得结果表现出相同的规律,但具体数值存在一定差异。分析认为,邻近区域同类型水库资料验证更符合实际情况,故在此类水库水温的数值模拟中,应尽量选择邻近区域同类型水库资料作为验证资料,若在条件不足的情况下,相关的天然河道资料也可以作为参考。

A vertical two dimensional hydrodynamic-temperature model is established for calculating variation in water temperature in reservoirs. The parameter calibration is carried out by comparing two sets of the observation data from the natural channel and the same types of reservoirs located nearby. According to the two sets of calibrated parameters, the water temperature in Reservoir D during the verification period and the complete process of the water temperature distribution in Reservoir A have been simulated respectively. The numerically simulated results indicate that the data from natural channels and the same types of the reservoirs located nearby can be used in the model parameter calibration when the other conditions remain the same. The numerically simulated results show the same tendency but different values applying those two sets of calibrated parameters. It is confirmed that the parameters obtained from the nearby reservoirs are more reasonable and close to realities. Therefore, it is recommended that in the reservoir water temperature simulation, the data from the same types of reservoirs located nearby are preferred, and the data from the natural channels can be used as a reference for analysis and studies of variation in the reservoir water temperature when the data are insufficient.