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No.26 (1979/12) >

 
Title :降雨インテーク・レートの 2・3 の特性について (1) (農業工学科)
Title alternative :Some characteristics of intake rate of rainfall (Department of Agricultural Engineering)
Authors :吉永, 安俊
Authors alternative :Yoshinaga, Anshun
Issue Date :11-Dec-1979
Abstract :1.この研究は降雨インテーク・レートの2・3の特性を明らかにする目的で行ったものである。2.供試土壌は石灰岩土壌(島尻マーヂ)の2mmフルイ通過試料を用いた。3.降雨は人工降雨装置で発生させた。4.降雨強度が大きくなるにつれて, タン水開始時間は短くなる。降雨強度とタン水開始時間の関係はt=a(R-α)^<-b>+βで近似できる。ここで, tはタン水開始時間(min), Rは降雨強度(mm/hr)a, b, α, β, は定数。5.雨滴は土壌表面の団粒構造を破壊して, 士粒子の移動による目詰まりを起させ, 土壌表面を緊密化する。それに伴って, 降雨インテーク・レートは低下する。6.降雨インテーク・レートは降雨強度の増加と共に大きくなる。
1. The purpose of this study is to make clear some characteristics of intake rate of rainfall by means of rainfall simulator. 2. Ryukyu limeston (Sample Nakaza, Gushikami-Son), passed through 2mm mesh size Sieve, was used as the testing soil. 3. It has been observed that the flood biginning-time (T) decreases as raifall intensity (R) increases. The relationship between (T) and (R) can be expressed by an empirical farmula : T=a(R-α)^<-b>+β In this formula, T is flood biginning-time (min), R is rainfall intensisty (mm/hr), a, b, α and β are empircal constants. 4. It has been observed that the falling raindrop breaks down aggregate of the soil, displaces, thansports soil particles, percolate with fine particles, which seal up the pores of the soil espacilly into the immediate surface, and compacts the soil surface, Consequently, the compact surface is responsible for low intake rate. 5. The Intake rate of rainfall increases in accordance with rainfall intensity.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4161
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.26 p.297 -305
Appears in Collections:No.26 (1979/12)

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