Monitoring of Soil Erosion Using Digital Camera Under Simulated Rainfall

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  • デジタルカメラを用いた降雨条件下の土壌侵食測定
  • デジタルカメラ オ モチイタ コウウ ジョウケン カ ノ ドジョウ シンショク ソクテイ

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Abstract

Soil erosion was estimated by photogrammetry using the digital camera. The precision was first assessed by comparing the measured data against photogrammetry under no rainfall condition. The assessment was based on the statistical parameters, the absolute error (AE) and relative error (RE), which are 0.0946 kg/m2 and 8.59%, respectively. In the second step, the precision was assessed for under simulated rainfall on soil surface packed to two different dry bulk densities. At 1.20g/cm3 density, the AE and RE were 6.62 kg/m2 and 1490%, respectively and corresponding values at 1.30 g/cm3 density were 0.675 kg/m2 and 86.0%, respectively. The soil saturated with water and whose bulk density was 1.38 g/cm3, was subjected to rainfall of intensities of 40, 80, 120mm/h continuously for 1 hour. They had AE (RE) of 0.0313 (36.1%), 0.0183 (26.4%), 0.0268 kg/m2 (29.8%), respectively, at each intensity.

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