地下水渗流补给-内源释放耦合作用下河流水质不确定模拟

Uncertainty modeling and analysis of river water quality including coupling of groundwater recharge and sediment release

针对河流-地下水环境系统的模糊性、不精确性及随机不确定性,采用梯形模糊数描述和表征河流水文、水质及水文地质参数,构建了集成地下水渗流补给与内源释放耦合影响的一维河流水质模糊模拟模型.在此基础上,就地下水渗流补给与内源释放的可能组合,设置5种情景,分别进行水质模拟,并对计算结果进行分析、对比.实例研究表明,对地下水渗流补给与内源释放耦合作用下的河流水质衰减变化规律,梯形模糊数有较好的模拟效果.

Based on the fuzziness,imprecision and randomness of the stream-groundwater environment system,a trapezoidal fuzzy number was adopted to describe and denote parameters of hydrology,water quality and hydrogeology.On this basis,a novel one-dimensional fuzzy water quality model which takes into account the coupling effects of groundwater recharge and sediment release was proposed by fuzzifying the input parameters in a deterministic water quality model.To further reflect the impact degrees of the two main factors above on the decay of river water quality,five possible scenarios,taking into consideration the impact of lateral groundwater recharge or sediment release,were explored intensively.Water quality modeling for each scenario was conducted,and simulation results were analyzed and compared with each other.The study results indicate that the newly established water quality model with trapezoidal fuzzy parameters proved to be effective in water quality modeling with coupling of groundwater recharge and sediment release for groundwater-dominated or seriously polluted rivers.