基于水环境数学模型的竹桥河流域综合整治成效模拟分析

A Simulation Analysis of Comprehensive Remediation Effect of the Zhuqiao River Based on Mathematical Modeling of Water Environment

以竹桥河水质达标为目的,综合考虑整治范围内水体污染来源及水文条件等因素,采用水环境模拟技术建立竹桥河流域的水动力与水质动态二维模型,采用现场实测、监测数据等有效资料对模型参数进行率定.并利用率定后的模型对综合整治方案进行水质模拟.结果表明:根据现有整治方案,当竹桥河流域整治后截污率达到60%的情况下,干流COD、NH4^+-N可在入河口稳定达到地表水Ⅲ类水质要求,但TP在河口处不能稳定达到地表水Ⅲ类水质要求.为保证水质稳定达标,还需对畜禽养殖污染进行控制,即减少生猪养殖约3 000头/年.

With comprehensive consideration of water pollution sources and hydrological conditions in the Zhuqiao River Basin,where water environment remediation practices are in place,a 2-dimensional(2D)hydrodynamic and water quality model that describes the transport of water pollutants was used to assess if the remediation practices could help the Zhuqiao River Basin achieve the Surface Water Quality Standards(SWQS).The model parameters were calibrated using both field data and monitoring data.The calibrated model was then used for water quality modelling of the Zhuqiao River Basin.The results show that if the sewage interception percentage reaches 60%as contributed by the remediation practices,the mainstream levels of COD and NH+4-N will stably achieve the ClassⅢSWQS at the mouth of the river while TP will fail it.In order to ensure that the overall water quality stably achieve the ClassⅢSWQS,the number of pigs should be reduced by approximately 3 000 per year to control the animal waste.