頁籤選單縮合
題名 | 阿公店水庫防淤操作成效分析之研究=Study on the Operation of Sediment Prevention for Agongden Reservoir |
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作者姓名(中文) | 葉建緯; 陳永超; 陳錦嫣; 陳文福; | 書刊名 | 水土保持學報 |
卷期 | 48:1 2016.03[民105.03] |
頁次 | 頁1589-1606 |
分類號 | 443.96 |
關鍵詞 | 空庫排砂; 排渾蓄清; 防淤測量; 泥砂觀測; Empty flushing; Releasing muddy and storing clear; Sedimentation prevention measurement; Sediment monitoring; |
語文 | 中文(Chinese) |
中文摘要 | 阿公店水庫於民國42年完工,由於缺乏有效排砂設施以致淤積嚴重,至民國70年時,水庫淤積率已達73%,水庫防洪能力由250年頻率洪水降為50年頻率洪水。故於民國86年起辦理更新改善計畫,至民國94年完工,更新改善防淤策略並採空庫排砂,然因原來豎管高度高達35.5m,當有異重流發生時濁水不易排出,故將其高度降低8.5m而成27.0m。汛期時保持空庫以利溢洪豎管排砂,枯水期則由旗山溪越域引水入庫,此排渾蓄清的因應措施,甚有利於減少水庫淤砂,依過去空庫防淤較佳操作模式試驗,相當於每年之2/3來砂量可藉由空庫防淤操作排出。 自水庫於民國94年更新完成至今(103年)已9年餘,已辦理10次淤積測量及自98年起每年辦理「阿公店水庫空庫防淤泥砂觀測及成效評估」計畫。本研究依據防淤測量、泥砂觀測成果及過去研究試驗成果進行研究評析獲致兩項結論:(1)水庫主要土砂來自泥岩地質區之濁水溪集水區,更新改善後經過3年之空庫排砂運轉,依據歷年淤積測量結果淤積量67.68萬m3,較水庫興建完成初期3年之淤積量121萬m3,約減少50%,顯見空庫防淤操作之效果 (2)水庫經3年運轉後,水庫淤積顯著減少。此可能與水庫淤高後導致上游河道水力坡降變緩及沖刷力減弱,致其相對入庫土砂減少有關。 |
英文摘要 | Agongden Reservoir was completed and operated in 1953. Sediment deposition and accumulation in reservoir area was a serious problem for lacking of efficient sediment flushing facilities. 73% of reservoir capacity was stored by sedimentation, and capability of flood protection was reduced from 250-year to 50-year flood in 1981. A rehabilitation program was executed for the reservoir from 1997 to 2005. The new sediment countermeasures are “empty flushing sediment” and “storing clear and releasing muddy”. The sediment is flushing out of reservoir in monsoon season, and water diverted from Chishan River is stored in dry season. In order to assess effect of sediment countermeasure, topographic survey has been conducted for 10 times in reservoir area since Agongden Reservoir rehabilitation program completed in 2005. This study is to evaluate the effect of Agongden Reservoir sedimentation prevention operation based on the topographic survey reports and the Effect Assessment of Empty Storage Operation for Sediment Prevention Observation Program of Agongden Reservoir reports. The first conclusion is that new sediment is deposited in all over the reservoir area and sediment at reservoir upstream is scouted for the first 3 years of reservoir re-operation. The second conclusion is that the amount of new sediment is relatively small after the first 3 years of reservoir re-operation though a few large rainfall events happened. This may relate to the river scouring decreasing because of the hydraulic gradient getting gentle to the upstream river. Then the sediment in the reservoir will be decreasing. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。