Grant-in-Aid for Young Scientists (B)
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.
Attribution of KAKENHI