冻结期与融解期潜水蒸发系数模拟研究

Simulative Study on Groundwater Evaporation Coefficient in Freezing and Thawing Period

根据河套灌区的长期观测资料,确定非冻融期参数后,由稍作修改的水量均衡方程及优化求解方法计算地下水埋深,对冻融期潜水蒸发系数公式逐步进行分析改善,最后在冻结期和融解期采用增加常数项的指数形式的潜水蒸发计算公式,模拟计算的地下水埋深与实际观测结果拟合最好。根据模拟结果,冻融期的潜水蒸发系数仅用地下水埋深来表示,其它影响因素反映在参数中,模型简单,方便实用。

With collected data of the irrigation district in Inner Mogolia, groundwater depth is calculated through slightly amended water balance equation and optimization method after the parameters in the nonfreezing-thawing period is ascertained. Groundwater evaporation coefficient in the freezing and thawing period is analyzed and improved gradually. It is shown that the calculated groundwater depth is much more dependable with the exponential type formula in the freezing and thawing period. According to the determined model, groundwater evaporation coefficient in the freezing and thawing period is only expressed by groundwater depth, and the other influencing factors are reflected in the parameters. The model is simple and convenient for the practical applications.