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Estimation of Sediment Yield Using Digital Aerial Photogrammetry Method-Da-Chia River Course from Mar-An Dam to Tien-Loon Dam-
|關鍵字:||digital aerial photogrammetry|
The technology of the digital aerial photogrammetry was very mature at the current stage. By using this technique, this study surveyed the sedimentation and the deposition behaviors of Da-Chia river from Mar-An dam at downstream to Tien-Loon dam at upstream. A digital terrain model of the river was generated based on aerial river photography. This study estimated the quantity of the stony material resources, explored the long-term variation of erosion and deposition of riverbed due to the flow current. In addition, the quantity of sediment on the riverbed was calculated by USLE soil erosion equation, Da-Di-Shih empirical formula and Takahashi equilibrium concentration formula. According to the collected data of sediment volume from dredge projects performed by Water Resource Agent in the duration of 2005 to 2008, the feasibility for dredging from the riverbed between Mar-An dam and Tien-Loon dam was investigated. In this study, the sediment yield was calculated by using Digital Elevation Model (DEM) transferred from digital aerial photos which were taken in, 1998, November 2005 and January 2009 in sequence. Meanwhile, it can be observed the riverbed between Mar-An dam and Tien-Loon Dam was in the situation of erosion as the DEM of January 2009 was overlapped with that of November 2005. The quantity of eroded sediment approximated 424104 m3 (included man-made dredge). On the contrary, comparing the DEM of January 2009 with that of 1998, it was found the riverbed between Mar-An dam and Tien-Loon Dam was in the situation of deposition. The quantity of deposited sediment was estimated about 545104 m3. Eventually, using USLE soil erosion equation, Da-Di-Shih empirical formula, Takahashi equilibrium concentration formula and Schoklitsch sediment transportation formula to calculate the sediment transportation, it was found that the annual sedimentation in riverbed was about 120.86104 m3.
|Appears in Collections:||水土保持學系|
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