Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/13571
標題: 平地水筒模式於低平區域排水模擬之研究
Simulation of Drainage in the Low-lying Basin by Diffusive Tank Model
作者: 許日杰
Hsu, Ryh-Jier
出版社: 土木工程學系
摘要: 
長期以來,利用單位歷線法對流域進行逕流分析,並不能
充分反應出具貯留效果之流域(特別是流域內具有大面積之水
田)的逕流特性;另外以變量流方程式為主幹之淹水模擬模式,
因處理之水文與地文資料數量龐大且較為繁雜,再加上變量流
方程式本身複雜之水理計算,使得模擬時間大幅增加。雖變量
流模式計算精度較高,但其面對大流域之水理計算時過於繁
複,易造成計算時間過長、計算機記憶體容量不足之窘境,勢
必要增加計算機容量及等級方能應付整個流域模擬的需要,因
此在設計水工結構物或建立、評估淹水預報模式等時,常令現
場工程師、決策者不敢輕易嘗試。故發展一快速、簡便、易操
作之淹水模擬模式,為一值得討論研究的課題。
本文以簡化變量流運動方程式來進行低平水田地區排水渠
道水流之數值模擬,主要是利用水田區域的集塊概念(Lumping
notion)將大區域流域面積及二次河道排水路(幹、支線)各自
劃分成數個水筒,在依其特有之水理特性,以適用之水理公式
加以計算,而構成平地水筒模式。根據先趨研究結果顯示,平
地水筒模式其精度雖略遜於變量流模式(1),但在面對低平流域
之水理計算時,其精度幾乎與變量流模式相似,並可大幅提昇
計算速度,且所需之計算機記憶體容量亦較少,適合移植至PC
上執行。
本文之最終目的為建立一精確且能迅速得到計算結果之排
水系統淹水模擬模式,以利於現場實作推廣,並可提供下游防
災排水設施規劃之設計參考。

Articles of report , the major methods make use of Implicit
Newton- Raphson scheme, from the momentum equation of
unsteady flow to process the numerical analysis of
the low level paddy then simplify the momentum equation of
unsteady flow to the momentum equation of
nonuniform flow(Diffusive Tank Model) .
The results of simulation will show the precision of the model
of unsteady flow is better than nonuniform flow, when
used on the big basin we have some problems , for example ,
complex hydraulic computation , cause computer time too
long 、the memory of computer is not enough
.but the model of nonuniform flow is used on the same situation
, we find it can speed up the computer time , decrease the
computation that needs memory capacity , the precision is
good , and we can be qualified to divert to PC (personal
computer). The
purpose of our research establishes a drainage system that is
exact and gain results quickly , else we can operate in
field easily. The nonuniform flow model satisfies our
needs , therefore , we suggest to use nonuniform flow model
which can provide the reference of assessment and design
of drainage network , when build the drainage network of low
level paddy in Taiwan .
URI: http://hdl.handle.net/11455/13571
Appears in Collections:土木工程學系所

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