各種斜面保護材の土壌流失防止効果に関する実験的研究 : 超大型降雨装置を用いて降雨強度を段階的に変化させた場合

Experimental Study on the Effectiveness of Protective Sheets Designed to Prevent Soil Erosion Caused by Rainfall : A Case Step Change of Rainfall Intensity through the Use of a Large Scale Rainfall Simulator

Creators Kusaka Tatsuro

Creators Fukada Mitsuo

Creators Terashima Haruo

Creators Roy Kingshuk

To investigate the effcctiveness of method to protect soil against erosion caused by rainfall, an experiment was carried out using a large scale rainfall simulator. Selected protection methods were (a) covering with three types of sheets (b) setting with three types of obstacle just below the ground level c burring canal under the ground. Each protection method was set up in a plot having a slope of 18° and a length of 10m, except for a method of a covering sheet which was set up in a three plots having different length of slope I.e. 5, 7 and 10m. Rainfall was simulated on the slope continuously. The intensity of the rainfall varied between 25 mm/hr for 4 hours to 200 mm/hr for 1 hour. The volume of run-off and the mass of sediment from these plots were measured every 10 minutes. From the results obtained, it was found that, in the case of rainfall intensity 50 mm/hr, the protection methods of covering sheets (a) were all more effective than the other protection methods (b) and c.

[ISSN]0513-1715

[NCID]AN00244250