Study on quantitative evaluation and modeling of water quality conservation function of irrigation pond

本研究的目的是为增强灌水池的水质涵养功能提出建议。这项研究是在日本大阪岸和田的河内山灌溉池塘及其集水区进行的。本研究的主要研究结果如下：1)荷基科可以减少作为其水源的河流下游的营养盐负荷。2)现有的专属水域水生态系统水质估算模型，通过利用池水测定的浮游植物行为相关参数，可以在一定程度上估算和预测池塘中的氮、磷。因此，在促进池塘水质保护功能增强的同时，也应考虑池塘水质的保护。4)似乎可以推动更积极的水质保护策略，例如利益相关者为减少流域内的污染物负荷而采取的具体行动，以及引入经济的净水系统。

The purpose of this study is to propose for enhancement of water quality conservation function of irrigation pond. This study was conducted in Hojiike, which is an irrigation pond, and its catchment area located in Konoyama, Kishiwada, Osaka, Japan. The results of this study can be summarized as follows :1) Hojiike could contribute to reduction of nutrient load flowing down along the river which is its water resource.2) The existing water quality estimation model regarding aquatic ecosystems in exclusive water area could to some extent estimate and also predict nitrogen and phosphorus in the pond by applying parameters related with phytoplankton behavior determined using the pond water.3) Stakeholders of the pond were very anxious for degradation of water quality of the pond. So conservation of water quality of the pond should be also considered when the enhancement of water quality conservation function of the pond is promoted.4) It seems possible to promote more positive strategy for water quality conservation such as some concrete activity for reduction of pollutant load put into the catchment by the stakeholders and introduction of an economical water purification system.