Laserfiche WebLink
<br />EM 1110-2-1416 <br />15 Oct 93 <br /> <br /> SL WATER SURFACE e <br /> /'-~ ____ ISlAND ~f""\.- <br /> SECTION 4 <br />f;l (NO SCALE) <br />'" <br />SEe J NOTES: <br /> 1. FlOW VELOCITIES ARE ASSUMED CONSTANT <br /> ACROSS THE CROSS-SECTION EQUAl TO THE <br /> DISCHARGE DMCED BY THE TOTAL AREA. <br /> 2. LOCATION OF SECTIONS MAY PREDETERMINE <br /> FlOW DIRECTIONS AND now CONOmONS. <br /> J. NOTE ASSUMED DIRECTION Of' now AT , <br /> . <br /> SECTIONS 5 AND 6 APPROACHING 7. <br /> NO CONVERGENCE IS SIMULATED. <br /> 4. SEC'OON 4 SHOWS SPlIT FlOW AND is . <br /> WIDE YET WATER SURFACE IS ASSUMED . . <br /> LEVEL FOR 1-0 ANALYSIS. <br /> <br /> <br /> <br />~ '" <br /> <br />f;l <br />'" <br /> <br />u <br />w <br />~ <br /> <br />Figure ....2. One-dimenslonalllow limitation In eache creek setlllng basin <br /> <br />computational effort than steady state simulations (Gee et <br />al. 1990). Furthermore, the analysis and presentation of <br />results from a dynamic simulation is much more complex <br />than that of a steady flow simulation. Therefore, in <br />designing a multidimensional flow study it is important <br />to decide whether a dynamic analysis is necessary. In <br />most riverine stUdies, steady flow is adequate; in tidal <br />systems it never is. The alternative design configurations <br />and/or flows to be studied must be carefully selected to <br />maximize study efficiency and ensure that all relevant <br />situations are analyzed. Refer to Appendix C for more <br />detailed information regarding the contents of a work <br />plan for the application of a multidimensional Ilow <br />model. <br /> <br />4-7. Available Computer Programs <br /> <br />a. Use. Use of two-dimensional numerical modeling <br />techniques is becoming a routine and accepted engineer- <br />ing practice. Inexperienced analysts should seek guid- <br />ance and advice from experienced engineers, particularly <br /> <br />4-4 <br /> <br />early in the study, to define data and resources needed <br />for complex model applications. Application of such a <br />sophisticated numerical flow model for a one-time study <br />may best be accomplished with the assistance of a Corps <br />laboratory or outside conlraclor. Development of <br />in-house expertise for such applications, while requiring <br />significant initial investment of resources in training, may <br />result in future savings if several similar studies are <br />planned. Consideration must be given 10 model avail- <br />ability (public versus proprietary), applications experi- <br />ence, training and documentation, features, applicability, <br />and required computer resources. Good graphics capabil- <br />ities, both screen and color hardcopy, are essential 10 <br />perform efficient and successful applications of multi- <br />dimensional flow models. Multidimensional flow model <br />applications should be integrated with CADD and/or GIS <br />as appropriate for study needs. <br /> <br />b. RMA-2. Computer programs are readily available <br />for conducting two-dimensional river hydraulics analyses <br />in the horizontal plane (Thomas & McAnally 1985, <br /> <br />e <br /> <br />. <br />~ <br /> <br />e <br />