Laserfiche WebLink
<br />OfJ098;l <br /> <br />1989, Vries, el a\., 1980), This material has been used in many projects at UNL and <br />simulates sand movement and streambed geometry very well. A small quantity of <br />lightweight plastic spheres will be purchased and used to determine where flow velocities <br />are the slowest in the model and will indicate where sediment is likely to settle out. Water <br />and sediment will be pumped to the upstream end of the model and will then flow through <br />the modeled reach and recirculate upstream. <br /> <br />Exoected Results <br /> <br />Participating agencies are invited to propose ideas for testing and simulation. Thus <br />far, the following issues have been identified for investigation: <br /> <br />1. Can the model reproduce historically observed water surface elevations during <br />floods? <br /> <br />2. Will river flows affect artificial islands created for habitat improvement? <br /> <br />3. How would the construction of an artificial island within the channel affect <br />a. flow near the banks (erosion) <br />b. flood frequency and depth (fill effects) <br />c, channel properties downstream from the island <br /> <br />4. How would bank stabilization measures affect the channel? Would the flow cut <br />a deeper channel and erode downstream reaches? <br /> <br />5. If discharge were kept to prescribed levels during the year, <br />a. would the stable width of the channel change? <br />b. would more sand bars or braided islands appear? <br /> <br />6. If surplus sediment from upstream dredging were introduced into the channel, <br />a would a more braided (more favorable) habitat result? <br />b. how would flood elevation and frequency be affected? <br />c. how would downstream reaches be affected? <br /> <br />7. Can a scaled physical model be used to test and verify previous computer <br />modeling efforts? <br /> <br />Additional Benefits <br /> <br />The proposed project will demonstrate the feasibility of using a scaled physical <br />model to simulate the Platte River. It is expected that interested managers and researchers <br />who visit the model during operation will develop new ideas and proposals to be tested. <br />The model is expected to stimulate additional interdisciplinary discussion on what might be <br />attempted in the laboratory and field to fmd an appropriate balance between water supply <br />and demand. Finally, because the model can be changed easily to test river management <br />alternatives, it is expected that new field work will result from the model investigation. <br /> <br />Particioation <br /> <br />Support is sought on an appropriate cost share basis from <br /> <br />I. Central Platte Natural Resources District <br />2. U.S. Army Corps of Engineers Omaha District <br />3. Nebraska Public Power District <br />