Please use this identifier to cite or link to this item:
Evaluating Changes in Flood Hydrographs with the Curve Number Method
|作者:||王成ㄎㄨㄣ||關鍵字:||stormflow hydrographs;暴雨逕流歷線;Pi-Lu-chi;runoff curve number method;non-unit hydrographs;畢祿溪;逕流曲線指數法;無因次單位歷線||出版社:||水土保持學系||摘要:||
Proper analysis of runoff characteristic is one of the primary works for watershed planning management. Runoff curve number method was originally developed by the U.S. Soil Conservation Service(SCS). It can be used to estimate stormflow hydrographs by calculating rainfall excess with triangular unit hydrograph or non-unit hydrograph method. This study evaluated changes in flood hydrographs of forested watersheds by calculating rainfall excess with SCS curve number method for hydrologic assessment, planning and designing. The applicability of SCS curve number method for headwaters forested watersheds in Taiwan was evaluated by comparing simulated and observed stormflow hydrographs of Pi-Lu-chi experimental watersheds No.11 and No.12.
The results indicate good agreements between simulated and observed hydrographs for the two study watersheds. The estimated and observed hydrographs show similar trends. However the hydrographs simulated with the SCS curve number method have sharper peaks. The observed hydrographs were smoother and flatter, exhibiting long recession limbs. This was due to the slow and gradual withdrawal of water from storage, e.g., movement of water from subsurface storage and drainage systems. However, hydrologic functions by subsurface flows were not considered in the development of SCS curve number method. Therefore, SCS curve number method requires some modification based on streamflow generation mechanisms for application to forested watersheds.
|Appears in Collections:||水土保持學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.