Two-dimensional unsteady flow modeling of flood inundation in a leveed basin


Carr K., Tu T., Ercan A., Kavvas M., Nosacka J.

World Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems, Texas, United States Of America, 17 - 21 May 2015, pp.1597-1606 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1061/9780784479162.156
  • City: Texas
  • Country: United States Of America
  • Page Numbers: pp.1597-1606
  • Middle East Technical University Affiliated: No

Abstract

© 2015 ASCE.The Cache Creek Settling Basin (CCSB) is a 14.5 square-kilometer sediment retention basin designed to trap sediment and reduce sediment loads into the Yolo Bypass. The basin, and the 13-kilometer stretch of leveed creek from the United States Geological Survey (USGS) Cache Creek at Yolo gauge (11452500) to the upstream boundary of the basin, were engineered to safely conduct flows up to 850 cubic meters per second with approximately 1-meter of freeboard. The sole purpose of the basin is to retain sediment and protect floodway capacity of the Yolo Bypass. As a retention basin, the CCSB functions by spreading incoming flow from Cache Creek over heterogeneous terrain, consequently decreasing velocity and increasing residence time within the basin. Flows discharge from the CCSB via an uncontrolled overflow weir, and a low-flow culvert, such that large outflows are not managed. Simulating the hydrodynamics of the basin, focusing on water surface elevation and inundation extent, is a vital initial step in evaluating the ability of the basin to protect floodway capacity downstream. Two-dimensional unsteady flow modeling of an extent of Cache Creek from the USGS Yolo gauge through the CCSB is presented with a focus on calibration to confidently model inundation area.