The U.S. Environmental Protection Agency is sponsoring the Complex Terrain Development program, a multi-year integrated program to develop, and validate practical plume dispersion models of known reliability and accuracy for simulating one-hour-average ground-level concentrations downwind of elevated sources during stable atmospheric conditions in complex terrain. The first major component of the Complex Terrain Model Development program was a field study conducted during the fall of 1980 at Cinder Cone Butte, a roughly axisymmetric, isolated 100-meter tall hill located in the broad Snake River Basin near Boise, Idaho. The second field study was performed during 1982 at Hogback Ridge, an 85-meter-tall two-dimensional ridge located west of Farmington, New Mexico. The report documents work performed subsequent to the Third Milestone Report to continue further development of the Complex Terrain Dispersion Model (CTDM). In particular, it provides a detailed mathematical description of CTDM, shows how terrain effects on plume dispersion are handled, and tests the importance of using high resolution, onsite meteorological measurements as input to model calculations. A description of the preliminary Tracy Power Plant study is also included.

"Environmental Research & Technology, Inc." "February 1985." "Contract no. 68-02-3421." "EPA/600/3-84-110." Includes bibliographical references.