Defense Special Weapons Agency, 6801 Telegraph Rd., Alexandria, VA 22310-3398

A -- FREE FILLED CRATERING AND GROUND SHOCK CALCULATIONS AND DATA ANALYSIS POC Brian Wilt, Negotiator, (703) 325-6960, Scott G. Morton, Contracting Officer, (703) 325-1200. The Defense Special Weapons Agency (DSWA) is seeking technical support to continue its development of two- and three-dimensional cratering and ground shock estimates and prediction tools. In order to make those tools available to DOD forces, Agencies, and Services, we also need to provide for the demonstration and distribution of those prediction tools. Finally, in order to validate those estimates, we need to provide for the automated archival, retrieval, and analysis of existing data. We also as needed to achive and analyze data from additional simulation experiments to validate advanced target attack concepts. DSWA predecessors have expended considerable effort, over the past 50 years, in determining the cratering and ground shock from near-surface nuclear explosions. They have developed data bases, numerical techniques, and material models for cratering and ground shock environments. Burst configurations range from the near surface heights of burst (HOB) to depths of burst (DOB) detonations. They demonstrated that the same techniques are applicable to detonations of high explosive charges and high velocity penetrators. As a result, DSWA now directs world-class efforts in numerical modeling, data analysis, and effects estimation for cratering and ground shock. Recent two-dimensional ground shock calculations have once again highlighted the unique capability of nuclear weapons to hold hard and deeply buried targets at risk. In addition, these calculations have emphasized the need to use multiple burst tactics to hold at risk the hardest, most deeply buried targets. Such targets are frequently in area of substantial terrain relief, which results in violations of some of the assumptions used in the two-dimensional models. For example, the gravity vector in such areas does not align with the perpendicular to the free surface. As a result, the ejecta from the crater will not necessarily fall back into the crater and the up slope and down slope crater radii will be substantially different. In addition, the terrain roughness will inhibit the ideal deployment of a multiple burst array, which could disturb the required coherence of the threatening ground shock pulse. All contractor personnel will require a DOD security clearance of SECRET. Offerors must provide address information to the contract negotiator in order to be included on the mailing list for the solicitation. Address information must be in writing. Faxes are acceptable to the attention of Brian Wilt/AMB at fax number (703) 325-9295. Information on DSWA solicitations, already released, can be obtained by calling the DSWA Hotline at (703) 325-1173. As of 31 May 96, Acquisition Management has added ''Procurement Opportunities'' to the DSWA Home Page available on the World Wide Web. Information will include this synopsis and more. Please check us out at www.dswa.mil. Reference Synopsis No. 97-14 (0319)

Loren Data Corp. http://www.ld.com (SYN# 0002 19961115\A-0002.SOL)