| OCR Text |
Show The model identifies the proper flow condition and adjusts Qu and upper layer thickness at the north end, a1N, iteratively until boundary conditions are satisfied. In the following illustration, " H" refers to the depth of the north or south arm, " u" is velocity and " a" is the depth of the upper or lower layers for either the north or south, and " p" is the fluid density of either upper or lower layers. Entrance losses are distributed evenly along side walls and the bi- directional flow interface from upstream critical section to the downstream critical section. It was also assumed also that p2 is greater than px and that HN is less than Hs. Holley, et. al. ( 1976) assumed a free upper water surface and did not consider submergence in his derivations Two Layer Regime Figure 4. Flow regimes modeled with Holley, et al. ( 1976) revisions. Wold, et. al. ( 1996), used the model modified by Holly and added a very wide and shallow culvert to simulate the 1984 causeway breach. The model was calibrated to simulate water movements during the period from 1980 to 1986. It was discovered that the fill flow for the period of calibration was about 40 percent with equivalent head and density difference in the previous calibration. To accommodate this difference calculated fill flows were multiplied by a constant to reduce them to equivalent present condition flows. As lake 364 |
