Author : Jeremiah Lant
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (743 download)
Book Synopsis A Hydraulic Modeling Framework for Producting Urban Flood Maps for Zanesville, Ohio by : Jeremiah Lant
Download or read book A Hydraulic Modeling Framework for Producting Urban Flood Maps for Zanesville, Ohio written by Jeremiah Lant and published by . This book was released on 2011 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This project examines the flooding dynamics of the Muskingum River near the city of Zanesville, Ohio. Simulating various peak flood events using a hydrodynamic model will provide Muskingum County engineers with valuable information regarding inundated areas, extent, and effect on local communities for different flood events. The impact of various Muskingum River flood events, including the 100 year flood, on the urban environment in Zanesville, Ohio is studied. The project provides a useful hydraulic modeling framework that produces urban flooding maps for the city of Zanesville. These flood maps show how water surface elevations and water depths vary spatially and temporally, and provide a more detailed picture of how flood waves move in urban environments. A hydrodynamic model called LISFLOOD-FP is used to simulate river flow and flooding. LISFLOOD-FP is a finite-difference flood inundation model that can accurately model 1D or 2D channel flow along with 2D floodplain flow. Modeling efforts demonstrate that better knowledge of discharge on the Muskingum River provides a valuable insight into how floods travel through the floodplain. The Federal Emergency Management Agency, FEMA, conducts flood insurance studies to identify a community's flood risk. The flood risk study is based upon statistical data for river flow, storm tides, hydrologic and hydraulic analyses, and rainfall and topographic surveys. The FEMA maps only provide a one-time snapshot of a flood, and do not describe the full extent of the flood event including the spatial and temporal variability of various flood events. Questions, such as the changes in flood inundation extent with time for the city of Zanesville, cannot be fully explored using the FEMA maps. It has been shown that accurate mapping of urban flooding events must take hydraulic connectivity and mass conservation into account (Bates, et al., 2005). In other words, extending potential flood elevations along lines of equal elevation given a river elevation, the so-called "Planar GIS method," may be inadequate for characterizing urban flooding. An alternative approach involves the simulation of hydraulic processes, which would control flooding and inundation patterns in downtown Zanesville given the FEMA 100 year Muskingum River main stem water surface elevation. Such an approach provides the framework, not only for producing dynamic maps of different frequency flood events for the city of Zanesville, but also evaluating the impacts of adding and/or removing structures or changing land use on urban flooding. Model simulations of the 100 year flood defined by FEMA have been created as part of this research. In addition, a 1D HEC-RAS model was built to compare 100 year flood profiles with the 2D LISFLOOD-FP model. The LISFLOOD-FP model agrees with the FEMA flooding map in spatial extent, and in river height predictions to within 1 foot. A 1-D HEC-RAS model also agrees with both the FEMA and LISFLOOD-FP model predictions. Sensitivity tests indicate that a flood wave with a flow rate of 100,000 cubic feet per second would be required to inundate downtown Zanesville.
