3:30 PM - 4:45 PM
[AHW16-P07] Water reuse and Spatial distributionof Nutrient in drought risk area, Marugame plain
Keywords:Nutrient, Spatial distribution, drought risk
However, it doesn’t reveal how is spatial distribution of nutrient in Surface water-groundwater chain system area. So, We confirmed spatial distribution of nutrient and water stable isotope ratio and revealed the effect of too much water use to water environment in this study area, Marugame plain.
The result indicates Kanakura-river in Marugame plain is affected by depuration
Shallow groundwater results show groundwater in upstream area contaminates with nitrate nitrogen by fertilizer, but groundwater in downstream area decrease nitrate nitrogen concentration by denitrification.
Agriculture ponds water’s oxygen isotope ratio and chloride ion concentration
increase from upstream area to downstream area in Marugame plain. This result indicates that agricultural water eveporate. Nutrient balance considering eveporation in pounds show that supply of nutrient is higher than consumption of that in agriculture pounds in upstream area, but agriculture pounds in downstream area show opposite results. It can be said that purificating function of agriculture pounds is valid and the system which controls nutrient flowing to Seto Inland sea.