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Last modified
1/26/2010 10:11:22 AM
Creation date
10/5/2006 4:47:21 AM
Metadata
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Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Stream Name
All
Basin
Statewide
Title
Mudflow A Two Dimensional Hyperconcentrated Sediment Flow-routing computer Model
Date
3/1/1989
Prepared For
State of Colorado
Prepared By
Simons Li & Associates Inc.
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />2,15 <br /> <br />flow problems (Hromadka and Yen, 1987). Flood depths and Dutflow discharge <br />hydrographs were compared for vari ous channel slopes and i nf1 ow hydrographs, <br />The differences between predicted flood df!pths for the blo models was less than <br />3 percent. <br />Verification of the two,dimensional components of the OHM model was <br />estimated by expanding the K,634 model with one,dimensional node spacing. <br />Fictitious channel bands were established on the flood plain to define a hypo' <br />thet i ca 1 channel. The results showed reasonabl e corre ~I at i on between the two <br />approaches except at two sections which represent anamo14es in the channel that <br />can not be adequately modeled by the one,dimensional IK-634 model. The OHM <br />predicted a more viable flood plain boundary. .,.. , <br />Several other examples of this comparative approach were presented in <br />Hromadka et al. (1985), Hromadka and Durbin (1986), and Guymon and Hromadka <br />(1986). In HrDmadka et a1. (1985), a comparison of the DHM model using uniform <br />rectangu1 ar elements was undertaken with a fi nite difference model us i ng an <br />analog based on irregular triangular elements. The nodal domain integration <br />control volume definition was defined in a matrix system which is identical to <br />the Galerkin conduction matrix. The two approaches produced similar results. <br />The channel-routing component of the MUDFLOW model was tested for water <br />using the Telluride, Colorado Cornet Creek channel Dn a steep alluvial fan. A <br />comparison was made using HEC,2 for the same cha,nnel, Po, direct comparison for <br />all the grid nodes was impossible for highest discharges because the MUDFLOW <br />model was losing discharge at some nodes and gaining at Dthers due to overbank <br />flow and interaction with the flood plain. Further, the HEC-2 model assumed <br />critical flow depth at some cross sections. The velocity and depth results <br />compared reasonably well for a range of discharges. <br />A simulation of mud floods, water floods, and mud flows for various return, <br />peri od ra i nfa 11 events was conducted us i ng the MUOFLOW model for Cornet Creek, <br />Telluride, Colorado. From data consisting of photographs, eyewitness accounts, <br />and newspaper reports of the historical 1969 mud flows, the relative area of <br />inundation and volume of deposits (680,000 ft3) was estimated. These compared <br />well with the computed volume of sediment in the hydrograph (616,000 ft3) for the <br />25, year event.. Comparab1 e areas of i nundat i on and depths were s imu1 ated. Figure <br />2.1 shows the approximate area of inundation for the 1959 event. Figures 2.2 <br />and 2.3 show the maximum depths and velocities simulilted for the event by <br />MUOFLOW. The MUOFLOW model simulation produced a good replication of the 1959 <br />
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