Channel Morphological Evolution in Mud Rock Area of River Erhjen Upstream
Date Issued
2006
Date
2006
Author(s)
Lin, Hui-Yi
DOI
zh-TW
Abstract
This study focuses on the understating of morphological characteristics and evolutionary model in the mud rock area, southern Taiwan. According to the archive map analysis, comparison of channel evolution is mapped. Rill erosion and deposition is also observed during field experiments. The channel evolution and development of rill of mud rock are studied. The main research area is at the upstream area of River Erhjen.
The results show that it is useful to identify channel evolution by using historical map. According to the photo maps of 1976, 1988 and 2002, there are several types of morphological changing, including neck cutoffs, chute cutoffs, migration and rotation. The biggest neck cutoff is about 335 m in length. However there are several neck cutoffs in the study area are caused by land use change by human activities.
From the field survey, field rainfall simulations and monitoring of erosion pins, this study demonstrates the way of channel erosion. The biggest of slope retreatment is about 30 m within 26 years studying periods.
Subjects
二仁溪
河道變遷
河道演育
曲流
曲流切斷
River Erhjen
Channel Changes
Channel evolution
meander river
meander cutoffs
SDGs
Type
thesis
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