Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/13083
標題: 台灣地區逕流係數分佈之探討
The Study on Runoff Coefficient Distribution in Taiwan Area
作者: 陳立人
Chen, Li-Ren
關鍵字: runoff coefficient;逕流係數;rational formula;multi-regression method;合理化公式;複迴歸方法
出版社: 土木工程學系
摘要: 
集水區之水文規劃與管理經營中,逕流係數的應用常扮演著一個重要的角
色,因此,全面且有系統地決定集水區的逕流係數值就相當的重要。本研
究乃結合地理資訊系統技術與合理化公式,以建立台灣地區逕流係數分佈
圖,其架構係先依據台灣本島之地理與水文特性,將其劃分成三個地區,
再以地理資訊系統軟體ARC/INFO與ArcView求取集水區面積、坡度及河川
長度等相關參考地文因子值。在集水區設計尖峰流量值的求取上,則是採
用上述求得之具獨立代表性的地文因子,以複迴歸方法去求得100年頻率
年之設計尖峰流量。由複迴歸分析所得結果顯示,所劃定之地區內的集水
區具有相當的水文均一性與區域分佈特性。另一方面,各集水區之降雨強
度與集流時間可藉由運動波控制方程式推導之集流時間計算式與降雨強度
計算式聯立求得。最後,將求得之參數代入合理化公式中,即可反求出台
灣地區集水區100年頻率年之逕流係數值與繪製逕流係數等值線分佈圖。
整體而言,台灣地區集水區逕流係數的分佈是由東西兩沿海地區向中央山
脈呈現逐漸遞減趨勢。在中央山脈地區,逕流係數曲線呈現封閉環狀分佈
,其值介於0.55至0.7間;而在河川中下游平原地區之外圍曲線逕流係數
值為0.8,其值即可視為台灣地區河川中下游平原的逕流係數上限值。同
時,本研究之作業流程皆架構於地理資訊系統軟體ArcView中,並以其所
支援之Avenue物件導向程式語言,建構使用者介面以自動化與人性化地求
取集水區之尖峰流量、集流時間、降雨強度及逕流係數值。

In general, runoff coefficient plays an important role in
watershed hydrologic designs and managements.
Therefore, to systematically determine individual watershed
runoff coefficient is quite necessary. This study is thus to
combine GIS and rational formula to establish a runoff
coefficient distribution map over Taiwan area. Firstly, the
entire Taiwan island is divided into three major areas
according their geomorphologic and hydrologic properties, the
related physiographic factors such as watershed area, slope,
stream length ---, etc., can all be generated through GIS
software ARC/INFO and ArcView analyses. As for the estimation
of watershed design peak flow rates, multi-regression method
is used to obtain the 100-year frequency design peak flow
rate from the above physiographic independent variables. The
results shows the hydrogeneity for the watersheds selected in
each area and proves the zonal distributed properties in
Taiwan area. On the other hand, rainfall intensity and time
of concentration for individual watershed can be solved
simultaneously through kinematic-wave governing equations and
rainfall-duration formula. These parameters are then fitted into
rational formula, runoff coefficients can be obtained and
the associated distribution map can then be produced. In
summary, the runoff coefficients distribution over the island
declines from both east and west coast toward inland mountain
areas. In central mountainous area, the values are in closed
ring forms with the range 0.55-0.7.The outer value of runoff
coefficients in the plain area is 0.8 and it can be considered
as an upper value of watershed mountain zones.Also, the general
framework of this study is constructed on ArcView GIS
software. Since ArcView software employs AVENUE object-oriented
programming, the proposed method also contains a group of user
interfaces to automatically, user-friendly calculate the
outcomes of watersheddesign peak flow rate, time of
concentration, rainfall intensity as well as runoff
coefficients.
URI: http://hdl.handle.net/11455/13083
Appears in Collections:土木工程學系所

Show full item record
 

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.