Suspended sediment flow in paddy field irrigation systems and paddy field soil conservation

• Project/Area Number: 22780217
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Irrigation, drainage and rural engineering/Rural planning
• Research Institution: Utsunomiya University
• Principal Investigator: MATSUI Hiroyuki 宇都宮大学, 農学部, 准教授 (30292577)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 水田 / 土壌流亡 / 浮遊土砂 / 水管理 / 流砂系 / 土壌保全 / 粒径分布 / 灌漑システム

Research Abstract

I observed the suspended sediment flow in paddy field irrigation system on Utsunomiya and Ishigaki Island and examined measures of paddy field soil conservation. The following facts were noted.(1) Amount of suspended sediment runoff was more than 5.0 t ha^<-1> y^<-1> at paddy fields of Ishigaki.(2) The suspended sediment in paddy fields was assumed to be balanced on natural sediment transport system.(3) Resuspension on paddy field soil was assumed to occur around outlet.