The Study of Soil Erosion on Road Side Earth Disposal
| Autor: | Liao, Wei-Kuo, 廖偉國 |
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| Rok vydání: | 1998 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 86 The ways that roadside earth disposal give off sediments include rill erosion, inter - rill erosion and slumping. This study is focused on soil erosion on the road dumps of the industrial roads in Pin - Shi village. Erosion pins method was adopted to observe the erosion processes in 8 disposal sites. The age of the stacked disposal can divide into four stages from beginning to 2 years old. One other small observation plot was installed to collect runoff and sediments. Automatic device was installed for continuous rainfall and runoff recordings. Both inter - rill erosion and rill reosion were measured on these observatuons plots which were of 30 - 40 degree slope, since slopes steeper than 40 degree are too dangerous to conduct measurement. This study reveals that the average and single erosion depth of the erosion pin on inter - rill erosion and rill erosion area were over 10 mm and 92 mm respectivelyduring the first 6 month after the road was built. These measurements are 7 times and 73 time much the global averge erosion depth of 2.5 mm/year. The inter - rill erosion in 8 disposal sites reached a stable state 6 month after disposal. Because of the runoff effect, the rill erosion was different from inter - rill erosion. The total precipitation collected pen was 3163.2 mm from Octoer 1996 to June 1997 and the total sediment collected from the 7 m2 observation plot was about 14.529 kg. Since observation started 5 months after the road was built. It is very likely that erosion was even more severe during the fist 5 months after the road construction. Analysis of data reveals that both effective runoff and erosion rate decrease with increasing age of road dumps, which might be attributed to vegetation growth and soil crust. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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