The Study of the Soil Erosion in the Mining Area of Ban-Ping Shan in Reclamation Period

• Main Authors: WANG CHIEH CHUN, 王杰俊
• Other Authors: Hus Chung Li
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/52761840759524939097

碩士 === 國立屏東科技大學 === 森林系 === 95 === It is extremely complicated to estimate the soil erosion in watersheds. Various models are developed in recent years to predict the soil erosion. The most common model used for soil erosion is USLE (Universal Soil Loss Equation). Also it is the formula used for estimating the amount of soil erosion in soil and water conservation. The study explored the cause of different sediment by comparing the amount of sediment by USLE with it by practical measure. The results revealed that the increasing sediment in sediment basins #1~#4 of the mining area in Ban-ping Shan decreased rapidly in year 1999~2001, yet the decrease mitigated in year 2003~2006. The light increasing percent of sediment of sediment basin #2, #3 and #4 showed the soil erosion in watersheds have been stabilized. Based on the relationships between sediment and time by logistic regression analysis, it presented that the enormous difference was coefficient. The coefficient difference was the indicator of Cover and Management Factor and Support Practice Factor in watersheds. Furthermore, by exploring the relationships between sediment and slope, it was found that slope is an influential cause after the soil has been stabilized. By comparing the average erosion depth, in year 2003~2006, excluding the small avalanche in sediment basin #1, the erosion depth in watersheds of sediment basin #2, #3 and #4 were 0.84 cm, 0.5 cm, and 1.34 cm, which all were lower than the estimation of USLE. The results indicated that higher estimation happens when using USLE in long term mining area recovery. Nevertheless, the consequences of linear regression analysis showed that in year 1999~2001, there was no obvious correlation since it was the initial stage of vegetation recovery; in year 2001~2003, there was positive correlation between the estimation of sediment by USLE and the sediment by practical measure.