建議

1. 由大安溪迴歸結果，水平岩層河段的倒退量一致性的低估，當地 層為水平時的倒退速度相對於順向岩層河段較快，未來可考慮將 遷急點陡坡潛在破壞機制視為獨立因子納入考慮。

2. 本研究所採用之資料，主要為九二一地震後河道隆起，造成遷急 點倒退之案例，未來可考慮增加其他成因產生遷急點之案例。

3. 本研究模型將流量列為因子之一，然而部份地區流量資料取得不 易，未來可考慮建立僅採用雨量之簡化型倒退模式。

4. 由於在本研究中採用之河川流量差異甚大，對流量之正規化應依 照河川分級進行分類，以避免對於小流量之河川過度低估其沖蝕 能量。

5. 對於和弦搜尋演算法部份，由於 PSF-HS 修改一版在收斂失敗容易 造成嚴重誤差，推測為調音比率之問題，則可考慮用參考目前最 佳解的方式修正調音方向，或是決定是否調音。

8 參考文獻

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Theory and Applications, Springer Publishing Company, Incorporated.

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3881-3889.

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16. Hayakawa, Y., et al. (2009). "Rapid Recession of Fault-scarp Waterfalls Six-year Changes Following the 921 Chi-Chi Earthquake in Taiwan." Transactions, Japanese Geomorphological Union 30-1: 1-13.

17. Huang, M. W., et al. (2012). Knickpoint evolution across anticline structure: A case of uplifted reach in the Taan River, Taiwan ICSE6 Paris: 503-510.

18. Lee, K. S. and Z. W. Geem (2005). "A new meta-heuristic algorithm for continuous engineering optimization: harmony search theory and practice." Computer Methods in Applied Mechanics and Engineering 194(36-38): 3902-3933.

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for solving optimization problems." Applied Mathematics and Computation 188(2): 1567-1579.

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Music-Inspired Harmony Search Algorithm. GeemZ.W.: 1–14.

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論文，民國一零一年。

37. 盧泓佑，「1999 集集地震引致的河道遷急點倒退速率與倒退機制」，國 立交通大學，碩士論文，民國一零一年。

9 附錄一

抗沖蝕能力指數(Kh)估算依據

1、材料強度參數(mass strength number, Ms)

岩體材料評估強度的代表參數是無圍壓縮強度(UCS)，Ms值計算方式如

附表 1- 1 岩石材料強度評分表(Annandale, 1995,2006) 材料強度數值(M_s)

2、顆粒或塊體尺寸參數(K_b)

附表 1- 2 節理組數參數評分表(Annandale, 1995,2006) 節理組數值(J_n)

3、弱面抗剪強度參數(K_d)

Kd值由岩體的節理面粗糙參數(joint roughness number, J_r)與節理改變參 數(joint alteration number, J_a)來定義：

K_d = ^J_J^r

附表 1- 3 節理面粗糙參數評分表(Annandale, 1995,2006)

節理分離程度 節理面狀態 Jr

附表 1- 4 節理面狀態參數評分表(Annandale, 1995,2006)

岩塊的形狀因素採用節理間距比(ratio of joint spacing, r)來代表，可由水 流與岩層之縱剖面，如附圖 1- 1，看兩個方向的岩塊長度比值 y/x 來作 r 的 計算，其中 y/x 值最大取到 8。r 參數能反應出岩石河床材料受到侵蝕時，

瘦長的塊體較等邊的塊體抗侵蝕能力高的行為。

附表 1- 5 地盤構造條件參數評分表(Annandale, 1995,2006)

附圖 1- 1 岩塊長度比值 y/x 示意圖(Annandale, 1995,2006)

上述的流功以及 K_h計算出來後，當水流流功的能量大於由 K_h轉換得來 的流功時即表示會沖刷，相反的，當水流流功的能量小於或等於 K_h所轉換 得到的流功時則不會沖刷。

由此以上觀念可計算出沖刷深度；由於尾水的關係，當下游沖刷坑深度 越來越深時，尾水深度也會越來越深，當尾水深度增加的同時，尾水可消 耗的能量也同時增加，因此當水流經過尾水的消能後所剩餘的流功小於或 等於 K_h即表示水流的能量不足以產生沖刷行為。