| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2011: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Research Abstract |
To evaluate various countermeasures for diffuse pollution from irrigation fields, some procedures were developed for making topology dataset from existing elevation data and geographical data in GIS. The procedures could identify the topological spatial relationships between geographical objects including rivers, drainage canals, agricultural irrigation fields, water intake and effluent facilities and observation stations for flow rate and water quality using the coordinate and elevation of the objects, and make topology dataset to use pollution runoff models. Evaluation of influences on runoff volume and pollutant amount were conducted based on the procedures using several type of existing geographical dataset having different spatial accuracy. From the analysis using specific pollutant coefficients made from field runoff observations with different time intervals, estimation of pollutant amount during irrigation season were several times higher according to the observation intervals.
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