Accession Number:

ADA224265

Title:

Two-Dimensional Floodplain Modeling

Descriptive Note:

Technical paper

Corporate Author:

HYDROLOGIC ENGINEERING CENTER DAVIS CA

Report Date:

1990-06-01

Pagination or Media Count:

11.0

Abstract:

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.

Subject Categories:

  • Hydrology, Limnology and Potamology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE