Comparison of One-dimensional and Two-dimensional Computer Models of Water Flow Over Flood Plains Using the 1986 and 1994 Floods on the Waihao River Flood Plain PDF Download
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Author: R. J. Connell
Publisher:
ISBN:
Category : Floodplain management
Languages : en
Pages : 608
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Book Description
Author: R. J. Connell
Publisher:
ISBN:
Category : Floodplain management
Languages : en
Pages : 608
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Book Description
Author: D. Michael Gee
Publisher:
ISBN:
Category : Floodplain management
Languages : en
Pages : 14
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Book Description
A two-dimensional horizontal finite element numerical model (RMA-2) was applied to a 15 mile (24 km) river channel-floodplain reach in West Germany. Previous applications of such models have been restricted to much smaller scales. The results indicate that finite element schemes may successfully estimate river stage in large scale floodplain applications. Computed stage hydrographs compared well with observed data using loss coefficients within expected ranges. Two-dimensional flow models have been applied to certain classes of river channel problems. Applications have included detailed analyses of flow patterns near structures such as bridges and floodplains. In all these problems the scale of interest has been small, e.g. reaches of river a few river widths long. Many estuary studies have been done that were of large scale; some of these utilized a hybrid (numerical plus physical) modeling technique. In a review of the application of finite element methods to river channels, Samuels reported that the river channel was resolved separately from the floodplain in only two studies. Missing in previous work is attention to large scale floodplain modeling. The work reported in this paper focuses on the feasibility and accuracy of applying a two-dimensional flow model to a large floodplain. Traditional floodplain studies have used semi-empirical flow routing with steady, one-dimensional computation of water surface elevations to define inundated areas. Keywords: Army Corps of Engines. (kr).
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 522
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Book Description
Volumes for June 1964- include separately numbered but consecutively paged section: IHD bulletin (official publication of the New Zealand National Committee for the International Hydrological Decade).
Author: Paolo Molinaro
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 392
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Book Description
This collection contains 26 papers on mathematical modelling of flood propagation over initially dry areas presented at a specialty conference, held in Milan, Italy, June 29-July 1, 1994.
Author: Devinder Singh Dhillon
Publisher:
ISBN: 9781321015577
Category :
Languages : en
Pages :
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Book Description
Numerical modeling is the standard tool in determining floodplain areas for engineering and insurance purposes. For many years one-dimensional (1-D) models have been primarily used for these purposes, with HEC-RAS arguably the most widely used 1-D model. Relatively robust guidelines and specifications, as well as an industry standard of practice, currently exists for 1-D models. While 1-D models are relatively simple to apply and rather inexpensive to develop, they are based on several assumptions that do not always hold true in overbank flooded conditions. These shortcoming are particularly significant for models intended to simulate flow over levees or in very flat areas, such as the Central Valley of California.In recent years, 2-D models have been used as an additional tool in floodplain mapping to allow for more detailed analyses. Unfortunately, the assumptions behind these 2-D models are not fully understood by all users. 2-D models are even less understood by decision and policy makers. The Federal Emergency Agency (FEMA) has recognized the need for greater understanding and improved guidelines for applying 2-D models in flood studies and intends to widely disseminate the advantages and limitations of 2-D models examined. This work develops a) a literature review of 2-D modeling use for floodplain mapping; b) presents the Blue Ribbon Panel's (BRP's) results of the 46 issues; c) develop a question form for 2-D software vendors; and d) produce written guidelines that address limitations and capabilities of 2-D models to help practitioners, decision and policy makers use 2-D models more effectively.The decision on model complexity and dimensionality for a given case, can be based on two main ideas: a) the goal of the analysis, and b) the modeler. Thus, the steps to consider when facing a modeling task should be: a) define the goal of the study; b) select the adequate modeler for the task; c) chose the right tool for the goal of the study and the modeler; and d) perform the study considering all conditions.
Author: D.A. Kraijenhoff
Publisher: Springer Science & Business Media
ISBN: 9400945361
Category : Science
Languages : en
Pages : 375
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Book Description
Advances in computer technology, in the technology of communication and in mathematical modelling of processes in the hydrological cycle have recently improved our potential to protect ourselves against damage through floods and droughts and to control quantities and qualities in our water systems. This development was demonstrated in a 1983 post-experience course at Wageningen University where an international group of experts reviewed successful modelling techniques and described the design and operation of a number of forecasting and control systems in drainage basins and river reaches of various sizes and under various geographical and climat ological conditions. A special effort was made to bridge the gap between theory and practice; case studies showed that each forecasting system was designed to meet a set of specific requirements and they illustrated that the forecasting system can only be expected to operate reliably if, on the one hand, it is based on sound theoretical concepts and methods and if, on the other hand, it is robust so that, also under adverse conditions, it will continue to collect and process the necessary input data and produce correct and timely signals. We were pleased to meet with encouragement for preserving the course material and making it available to a wider public. This was effected by the team of authorf who elaborated, updated and harmonized the materia in two stages; first into an issue of our university department and finally into the manuscript of this book.
Author: Charles Noble
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
The desirability of accurately predicting the extent and duration of flooding resulting from the partial or total breach of a dam has been emphasized recently. The most practical way to meet this need is the development and use of good computer-based models. In order to predict the routing of floods, several hydrograph routing and one-dimensional models have recently been developed. Among the better known models are those employed in the code DAMBRK, Fread (1980) and in HEC-1 (1973). These models have proved to be quite good in predicting the flooding in those cases which have been amenable to a one-dimensional treatment. The accuracy of these models in situations which are clearly two-dimensional in nature is suspect, however. It is thus desirable to develop two-dimensional flood routing models to properly handle those situations in which the one-dimensional models are inadequate. Energy Incorporated (EI) has developed a computer code, FLOOD, that describes the two-dimensional motion of a flood. An analysis of the hypothetical Mackay Dam failure was performed using FLOOD. In this paper are given the equations used by EI, the numerical algorithm used for their solution, and the results of the Mackay Dam analysis.
Author: Kathryn Green Lee
Publisher:
ISBN:
Category : Floods
Languages : en
Pages : 129
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Book Description
Author: Gareth Pender
Publisher:
ISBN:
Category : Flood control
Languages : en
Pages : 780
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The aim of this project is to undertake a feasibility study into the potential utility of integrating high resolution two dimensional finite element flow models and Geographical Information Systems technology. The initial phase of this research concerns the construction of an operational high resolution flow model for a 60km reach of the Missouri River between Gavins Point Dam and Maskell gauging station. Specifically, the contract seeks to produce a CRREL report and to assess data needs for 2D FE models for river flow inundation. This report contains a brief review of progress on this work unit during months 3-6 of the research contact.
