應用無人載具調查莫拉克風災後知本溪整治之下游土砂變遷

Using Unmanned Areaial Vehicles to Investigate the Downstream Sediment Transition of Remediation in Zhiben Creek after Typhoon Morakot Disaster

陳鈺同(Chen Yu-Tung)

指導教授 ： 許中立

國立屏東科技大學/工學院/水土保持系所/碩士(2018年)

https://doi.org/10.6346/THE.NPUST.SWC.004.2018.D10

摘要

2009年8月8日莫拉克颱風帶來大量的降雨，造成臺灣南部與東部地區的災害，為能調整莫拉克風災後土砂不斷下移所衍生之相關問題，林務局臺東林區管理處於知本森林遊樂區進出的樂林橋上游800公尺處建立調節式鋼管防砂壩1座，並於下游拆除既有防砂壩。本研究以知本森林遊樂區上游調節式防砂壩至下游一號壩之河道為研究區域，以即時動態定位技術的方式量測控制點，後續則透過前後六期影像資料進行分析。研究結果顯示，四段河道中A區段為土砂攔蓄區域，河道於調節式防砂壩前淤積高度大約5公尺，而該區域淤積面積約佔總面積的87%。B區段為土砂沖蝕段，河道深度下刷大約5~10公尺，而該區域沖蝕面積約佔總面積的71%。C區段為土砂沖蝕段，河道深度下刷大約2~4公尺，而該區域沖蝕面積約佔總面積的78%。D區段為土砂淤積段，上游河道的部份淤積大約2公尺，下游的部份深度下刷大約2~4公尺，而該區域淤積面積約佔總面積的68%。利用建置調節式防砂壩以及拆(降)六號壩，使得B區段河道土砂下移，河道變化符合當初建制調節式防砂壩之規劃構想，緩解樂林橋及知本森林遊樂區之安全疑慮。

關鍵字

調節式防砂壩 ； 無人載具 ； 數值地表模型 ； 地形比較

並列摘要

On August 8, 2009, Typhoon Morakot brought a large amount of rainfall, causing disasters in southern and eastern Taiwan, and related problems arising from the continuous downward movement of sediments in the wake of the Morakot wind disaster. The Taitung Forest District Office is located at the 800 meters upstream of Le Lin Bridge in and out of the Zhiben Forest Recreation area to set up a adjustable steel pipe check dam, and to remove the existing sediments control dam downstream. In this study, the river channel from the upstream adjustable check dam to the downstream No. 1 dam in the forest recreation area was used as the study area, the control points were measured by VBS-RTK, and the subsequent data were analyzed through the image data of the previous and the following six periods. The results show that section A of the four sections of the channel is an area of sediments silting, and the silting height of the channel is about 5 meters in front of the adjustable check dam, and the area of deposition in this area accounts for about 87%.B section of the total area, which is the erosion section of the sediments. The depth of the channel is about 5 ~ 10 meters, and the erosion area of this area is about 71%.C of the total area. The section of section C is a section of sediments erosion, and the depth of the river is about 2 or 4 meters, and the area of erosion is about 78%.D section of the total area, which is a silt section of sediments. Part of the upstream channel is deposited about 2 meters, and the downstream part of the channel is brushed at a depth of about 2 or 4 meters, and the area accounts for about 68% of the total area. By using the construction of the regulating sediments control dam and the demolition no. 6 dam, the sediments in section B is moved down, and the river channel changes conform to the original planning concept of the adjustable check dam, thus easing the safety concerns of Lelin Bridge and Zhiben Forest Recreation area.

並列關鍵字

Adjustable check dam ； UAV ； DSM ； Terrain compared

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