2018 Fiscal Year Final Research Report
Environmental direct payment and insurance using water quality index for catchment area of a domestic water reservoir
| Project/Area Number |
16K15007
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Rural environmental engineering/Planning
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宇波 耕一 京都大学, 農学研究科, 准教授 (10283649)
竹内 潤一郎 京都大学, 農学研究科, 助教 (20362428)
濱 武英 熊本大学, くまもと水循環・減災研究教育センター, 准教授 (30512008)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | リン / 富栄養化 / 水田 / 森林 / 貯水池 / 流出負荷 / 渇水 / インデックス保険 |
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| Outline of Final Research Achievements |
The field observation reveals that types of land use (forest, paddy field, and residential area) and water purification systems (septic tank or rural sewage system) cause phosphate-phosphorus concentration difference among rivers in a catchment area of the reservoir for domestic water supply where water quality does not satisfy the environmental standard. It also reveals that less frequent heavy rainfall events such as typhoon, cause significant intensification of total phosphorus loads both from the paddy field and from the forested watershed. Using a generalized additive model, a drought index consisting of continuous no-rain days and discount cumulative air temperature is proposed, which could be useful for making water quality index insurance and for water management of a reservoir.
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| Free Research Field |
地域環境工学
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| Academic Significance and Societal Importance of the Research Achievements |
富栄養化が進行しつつある上水道水源池への森林及び水田からのリンの流入動態が明らかとなり，富栄養化防止対策の基礎資料として活用できる．提案した渇水インデックスにより，インデックス保険や溜池の水管理に利用できることが期待される．
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