Department of Commerce, Mountain Administrative Support Center, Procurement Division, MC3, 325 Broadway, Boulder, CO 80303-3328

A -- WAVE TANK STUDIES AND LABORATORY MODELLING AND THEORETICAL STUDIES OF WAVES IN THE UPPER OCEAN SOL NRMGL000500729 DUE 073195 POC Fran Starck, (303) 497-5326 A -- Provide expertise in the field of wave tank studies and laboratory modelling and theoretical studies of waves in the upper ocean. The series of experimental and theoretical works intended are to study the interaction between waves, currents, and turbulence and their manifestations on the surface. Specifically (1) Transformation of the surface wave on a 2-D nonuniform current. The time evolution of surface anomalies in the dipole field will be analyzed for various frequencies of surface wave; (2) Investigation of internal wave generation by stratified shear flows around bodies with critical layers (C) where the phase velocity of waves coincide with the shear flow velocity. Effect of the C on the wave drag force will be calculated; (3) Modulation of the growth rate of short capillary gravity surface waves by long waves in the presence of turbulent wind. The influence of this effect on the modulation of the short surface wave spectrum will be estimated; (4) Scattering of surface waves at a body moving with constant velocity under the fluid surface. Resonance effects connected with the coincidence of the group velocity of the scattered wave with the velocity of the body will be analyzed; (5) The propagation of short trains of intense surface waves in deep water will be studied experimentally in the large thermostratified tank. The evolution of abrupt changes of the surface wave intensity for various wave amplitudes will be analyzed. The experimental data will be compared with the results of the theoretical calculations; (6) Investigation of surface gravity wave interactions. The values of no linear additions to the wave phase velocity occurring due to the self-action and interaction of wave pairs propagating in the opposite direction will be measured. The experimental data will be compared to the calculation results; (7) Investigation of surface wave transformation on a 2-D non-uniform current in the tank; (8) Investigation of finite-amplitude gravity-capillary wave curvature in the wind-wave oval tank. The distribution functions of crest and trough curvatures of short, small- amplitude gravity waves will be obtained. The transformation of the curvature distribution functions on the profile of steep gravity wave will be studied; and (9) Surface wave (SW) damping on turbulence. The amplitude changes of the SW generated by a wavemaker after passing a turbulent layer produced by an oscillating grid located under the surface will be measured. The Institute of Applied Physics (IAP), Nizhni Novgorod Russia is considered to be the only known qualified source to supply the studies. In the absence of other qualified sources, it is the intent of the Government to award a sole source contract under the authority of 41 U.S.C.253(c)(1) for this service. This is not a formal solicitation. Interested firms and/or individuals may request to receive a copy of the solicitation when/if it becomes available. This notice may represent the only official notice of such a solicitation. (0199)

Loren Data Corp. http://www.ld.com (SYN# 0012 19950719\A-0012.SOL)