Type of Submission
Poster
Keywords
ArcGIS, HEC-RAS, HEC-GeoRAS, hydraulics, flood
Abstract
Massie’s Creek is a small tributary of the Little Miami River, located in southwest Ohio near the village of Cedarville. For approximately 1.5 miles (2.4 km) it flows westward through the Indian Mound Reserve Park, an area which occasionally undergoes flooding. In the first ½ mile (0.8 km) of the park, the stream is confined by a deep gorge, 40 feet (12 m) or more tall, and quickly flattens to a meandering stream through the rest of the park. The present study describes the application of HEC-RAS with the integration of ArcGIS for steady flow analyses and flood inundation mapping, as well as numerical data for stream velocity and shear stress through the area of interest (AOI). A Digital Elevation Model (DEM) of the Indian Mound Reserve Park is used in addition to bathymetric data points for flood inundation mapping. USGS stream gauge discharges equal to the 10%, 2%, 1% and 0.2% chance annual floods are used for investigation of various flood scenarios. Longitudinal profiles describe the energy gradients and critical flow levels through the AOI for respective floods. Color-coded stream velocity and shear stress maps indicate heightened values for the gorged portions of the AOI which settle out downstream. The steady flow simulation results of 10%, 2%, 1%, and 0.2% chance annual floods indicate inundation levels which pose little to no risk for nearby home-owners in Cedarville, OH.
Campus Venue
Stevens Student Center Lobby
Location
Cedarville, OH
Start Date
4-11-2018 11:00 AM
End Date
4-11-2018 2:00 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
A Hydrologic and Hydraulic Analysis of Massie’s Creek Gorge, Greene County, OH, Using HEC-RAS
Cedarville, OH
Massie’s Creek is a small tributary of the Little Miami River, located in southwest Ohio near the village of Cedarville. For approximately 1.5 miles (2.4 km) it flows westward through the Indian Mound Reserve Park, an area which occasionally undergoes flooding. In the first ½ mile (0.8 km) of the park, the stream is confined by a deep gorge, 40 feet (12 m) or more tall, and quickly flattens to a meandering stream through the rest of the park. The present study describes the application of HEC-RAS with the integration of ArcGIS for steady flow analyses and flood inundation mapping, as well as numerical data for stream velocity and shear stress through the area of interest (AOI). A Digital Elevation Model (DEM) of the Indian Mound Reserve Park is used in addition to bathymetric data points for flood inundation mapping. USGS stream gauge discharges equal to the 10%, 2%, 1% and 0.2% chance annual floods are used for investigation of various flood scenarios. Longitudinal profiles describe the energy gradients and critical flow levels through the AOI for respective floods. Color-coded stream velocity and shear stress maps indicate heightened values for the gorged portions of the AOI which settle out downstream. The steady flow simulation results of 10%, 2%, 1%, and 0.2% chance annual floods indicate inundation levels which pose little to no risk for nearby home-owners in Cedarville, OH.
