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Influence of slope width and length of fields on soil erosion

Research Project

Project/Area Number 08660296
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionYamaguchi University

Principal Investigator

KUSAKA Tatsuro  Yamaguchi University, Faculty of Agriculture, Professor, 農学部, 教授 (50038238)

Co-Investigator(Kenkyū-buntansha) FUKADA Mitsuo  Yamaguchi University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (20116750)
NISHIYAMA Soichi  Yamaguchi University, Faculty of Agriculture, Professor, 農学部, 教授 (80036045)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsExperiment of soil erosion / Soil erosion / Surface flow / Grading / Clay ratio / Rill / リル侵食 / リル形状 / 圃場斜面長 / 圃場斜面幅
Research Abstract

Eroded particles from clay loan and sandy loan soil using two surface flows (25cm^3/s and 50cm^3/s) were investigated. The experimented soils were uniformly packed on a wooden erosion box of 80cm in length, 30cm in width and 5cm in depth to conduct the erosion experiment. Slope of the erosion box was 10゚ and the surface flow was provided for 10゚ minutes. Sediments were collected at every 2 minutes interval after runoff began and hence 5 samples from one experiment were collected for analysis. In particle analysis, sieves were used to separate the sand particles and paper filters were used to separate silt and clay particles. Clay particles were eroded in higher amount in the primary intervals in both soils with both surface flows. Sand was highest with highest erosion whereas silt did not show any remarkable effect. Sand and clay were increased and silt transportation decreased when surface flow increased. Eroded soil particles in every condition differs to those of the original. In clay loam soil, ratio of eroded silt and clay to the original was higher. Eroded sand ratio was only higher to the original in case of sandy loam soil with greater surface flow. Rills were developed over the soil surface when the ratio of the eroded sand to the original was with in the range of 0.64-0.72. Also fine particle, was found higher in the eroded soil than the original. Finally, selective erosion process of the mentioned soils and the unknown condition for nil formation during soil erosion concerned to the eroded particles was being clear from the study.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 日下達朗: "新型孔開フィルター材の排水効果とその持続性-ジオシンセティクの利用に関する実験的研究(1)-" 農業土木学会論文集. 195(66-3). 181-187 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tatsuro KUSAKA,Mitsuo FUKADA,Soichi NISHIYAMA: "Effectiveness of Drainage and Durability of New Filter with Pretty Large Holes" Trans.JSIDRE. 195 (66-3). 181-187 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 日下達朗: "新型孔開フィルター材の排水効果とその持続性-ジオシンセティクの利用に関する実験的研究(1)-" 農業土木学会論文集. 195(66-3). 181-187 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 日下達朗: "新型孔開フィルター材の排水効果とその特性-ジオシンセティクの利用に関する実験的研究(1)-" 農業土木学会論文集. 195(66-3)(掲載予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] ロイ キンシュック: "土壌流亡量に及ぼす斜面幅および斜面長の関係" 日本砂丘学会誌. 43(2). 24-28 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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