水田蓄留對易淹水地區排洪能力之研究

The Effects of Paddy Fields Storage on Flood Discharge Capability in Inundation Areas

賴其均(Gi Jun Lai)

指導教授 ： 王裕民

國立屏東科技大學/工學院/土木工程系所/碩士(2008年)

https://doi.org/10.6346/NPUST.2008.00257

摘要

台灣省屏東縣，水田實際耕種面積佔可耕種面積22 %，旱田實際耕種面積可耕種面積25 %，而其餘53 %為長年作物。就水的角度而言，水田與旱田之間最大的差異為作物需水量。
本文重點係將田埂提高至可容納40公分之水深幫助調蓄洪水，故此，研究中以土庫地區排水系統為例，分別就現況、旱田轉作水田及水田蓄留等方案，利用SOBEK二維淹水模式就2年、5年、10年、25年、50年、100年之降雨強度下所發生之淹水潛勢狀況，探討水田蓄留對研究區域排洪能力之影響。
研究結果以就全區域在，以水文條件100年重現期水文條件下，在旱田轉作水田方案時全區域之減洪量為17.85 cms，減洪百分比為8 %。於水田蓄留方案時，減洪量由17.85 cms提升至28.80 cms，減洪百分比可由8 %提升至12 %。旱田轉作水田方案與現況方案比較之淹水面積差為44.48公頃、平均淹水深度差為0.06公尺、淹水量差為56,800立方公尺，其淹水面積消減百分比為8.4 %，淹水量消減百分比為1.3 %；水田蓄留方案與現況方案比較之淹水面積差由44.48公頃再減少了22.88公頃、平均淹水深度差維持0.06公尺、淹水量差由56,800立方公尺再減少了212,200立方公尺，其淹水面積消減百分比為8.4 %提升為12.7 %，淹水量消減百分比為1.3 %提升為6.3 %。

關鍵字

洪氾 ； 水田蓄留 ； 排洪能力 ； SOBEK模式

並列摘要

At PingTong County of the Taiwan Province, the paddy field actual cultivation area occupy 22% of cultivation area, the upland crop field actual culivation area occupies 25% for the real cultivation area, and other 53% for the perennial crop. From the view point of water consumption, the major difference between paddy field upland field is the crop water demand the paddy field and the dry farmland field the biggest difference is the crops demand for water, and influence drainage characteristic of the field.
This research focus on heighten of the rode between fields that may hold 40 centimeter depth of water to reduce the flood. Tuku area drainage system as the example, the investigation used SOBEK 2D inundation model to simulate flood probability status of precipitation in 2 years, 5 years, 10 years, 25 years, 50 years and 100 years return period. Therefore, discussing how paddy field storage system could possibly affect the discharge capability respectively by existing case, the upland crop farm change into the paddy field case and the paddy field storage case.
For hydrology condition is under 100 years return period，the flood reduction measure is 17.85cms, and the flood reduction percentage is 8% for the whole study area when the upland crop farm change into paddy field case is studied. The flood reduction measure increased from 17.85cms to 28.80cms, and the flood reduction percentage increased from 8% to 12% when the paddy field storage case is applied.
The difference in flooding area is 44.48ha, the average inundation depth is 0.06m, and the volume measure is 56,800m3 while the comparison is done between the upland crop farm change into paddy field case and the existing case. Also, and the inundation area of flood reduction percentage is 8.4%, the inundation measures of flood reduction percentage is 1.3%. For the case of paddy field storage, the flooding area reduced form 44.48ha to 22.88ha, the average inundation depth remain 0.06m and the flooding volume reduced form 56,800m3 to 269,000m3. Also, one can say that the inundation area of flood reduction percentage increased from 8.4% to 12.7%, the inundation measures of flood reduction percentage increased from 1.3% to 6.3%.

並列關鍵字

Inundation ； Paddy Fields Storage ； Flood Discharge Capability ； SOBEK Model

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