花蓮地區集水區河川侵蝕速率之研究

The Study of Watershed Denudation Rates in the Hua Lien Area

沈少文(Shaw-Wen Sheen)

《農業工程學報》 57卷4期 (2011/12) Pp. 14-25

https://doi.org/10.29974/JTAE.201112.0002

摘要

花蓮位於臺灣東部地區，時常發生颱風水患，因此探討當地水文變遷有助於花蓮地區永續經營與管理，本研究主要目的是分析花蓮溪與秀姑巒溪河川輸砂量與河川侵蝕速率。本研究使用1970年至2008年花蓮溪與秀姑巒溪河川流量－河川含砂量資料，建立迴歸模式以推測花蓮溪花蓮大橋測站、花蓮溪仁壽橋測站、秀姑巒溪瑞穗大橋測站與秀姑巒溪立山測站日平均含砂量。本研究計算河川輸砂量與河川侵蝕速率，花蓮溪花蓮大橋測站年輸砂量為1,803萬公噸，花蓮溪仁壽橋測站年輸砂量為366萬公噸，秀姑巒溪瑞穗大橋測站年輸砂量為1,004萬公噸，秀姑巒溪立山測站年輸砂量為159萬公噸。花蓮溪花蓮大橋測站侵蝕速率為443 mm／年，花蓮溪仁壽橋測站侵蝕速率為319 mm／年，秀姑巒溪瑞穗大橋測站侵蝕速率為242 mm／年，秀姑巒溪立山測站侵蝕速率為236 mm／年，花蓮溪花蓮大橋測站、花蓮溪仁壽橋測站、秀姑巒溪瑞穗大橋測站與秀姑巒溪立山測站四站平均侵蝕速率為310 mm／年，研究結果可供相關水土保持單位參考，有助於花蓮地區水文環境永續經營與管理。

關鍵字

河川輸砂量 ； 河川侵蝕速率 ； 花蓮

並列摘要

Hua Lien is located in the eastern area of Taiwan. Typhoons and floods often occur in the Hua lien area. Therefore, to examine hydrological changes of this area is helpful to the sustainable development and management of the Hua Lien area. The aim of this study is to analyze temporal changes in suspended load and denudation rates of Hua Lien Creek and Hsiu Ku Luan Creek. This study uses the rating equations to estimate daily average sediment content from daily mean discharge of the Hua Lien Creek and Hsiu Ku Luan Creek in the period of 1970 to 2008. Results show that the annual suspended load is 18.03 million tons at the Hua Lien Bridge station. The annual suspended load is 3.66 million tons at the Jen Shou Bridge station. The annual suspended load is 10.04 million tons at the Jui Sui Bridge station. The annual suspended load is 1.59 million tons at the Li Shan station. The annual denudation rate is 443 mm at the Hua Lien Bridge station. The annual denudation rate is 319 mm at the Jen Shou Bridge station. The annual denudation rate is 242 mm at the Jui Sui Bridge station. The annual denudation rate is 236 mm at the Li Shan station. The annual denudation rate is 310 mm at these 4 stations. The results are helpful to the sustainable development and management of the Hua Lien area.

並列關鍵字

Suspended Load ； Denudalion Rale ； Hua Lien