SIMULATION AND CONTROL OF URBAN SHALLOW LAKES WATER ECOSYSTEM WITH AQUATOX
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摘要: 城市浅水景观湖泊因其在水循环系统中的特殊性和其景观功能容易产生富营养化污染。针对位于成都市的某小型景观水体,混合了点源污染和非点源污染多种污染源,可持续生态维护难度较大,探索了利用水生态系统模型AQUATOX来模拟和预测该景观水体的水环境状态。根据为期1年的水质参数监测数据,分析不同来源污染负荷对水体营养物质含量的影响。利用实测数据拟合模型结果,分析模型运行的敏感参数,对相关参数进行率定,以增加模型对该水体水生态演变预测的准确性。使用高度拟合模型对水体富营养化关键决定参数TP、TN以及NH3-N对该浅水景观湖泊水质的影响,利用SWMM模型模拟LID措施对入湖雨水污染负荷的削减效果,LID措施后TP和TN的雨水径流污染负荷分别减少59.34%和58.39%,NH3-N的负荷降低21.94%,对降低面源污染效果负荷良好。水体中TP、TN和NH3-N含量的平均削减效果分别为38.57%、42.2%和58.31%,可为景观水体富营养化生态修复提供理论指导。Abstract: Urban shallow landscape lakes suffered high eutrophication risk because of their special characters and functions in the water circulation system. Using a landscape lake located in Chengdu in Southern China, with a mixture of point source pollution and non-point source pollution, to which sustainable ecological maintenance was more difficult, we explored the methodology of AQUATOX to simulate and predict the state of this lake. According to the one-year monitoring data of water quality parameters, and trophic index was used to assess the eutrophication state to characterizing water pollution status. Using the measured data to fit the model results, we analyzed the sensitive parameters of the model operation, and determined the relevant parameters to increase the accuracy of the model in predicting the water ecological evolution of the water body. Using the height-fitting model to determine the effect of TP, TN and NH3-N on the water quality of shallow water landscapes, and SWMM model to simulate the effect of LID measures on the reduction of rainwater pollution load in the lake. After LID measures, the stormwater runoff pollution load of total phosphorus and total nitrogen decreased by 59.34% and 58.39%, respectively, and the ammonia nitrogen load decreased by 21.94%. and the average reduction rates of TP, TN and NH3-N in water were 38.57%,42.2% and 58.31%, respectively, which provided theoretical guidance for eutrophication and ecological restoration of landscape waters.
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Key words:
- landscape lakes /
- eutrophication /
- multiple pollution sources /
- AQUATOX /
- ecoremediation
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