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Wind Erosion:
An International Symposium/Workshop

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Wind Erosion Prediction System: Weather Generation Submodel

J. Tatarko, E.L. Skidmore, and L.E. Wagner


The Wind Erosion Prediction System (WEPS) requires wind speed and direction in order to simulate the process of soil erosion by wind. These and other weather variables are also needed to drive temporal changes in hydrology, crop growth, soil erodibility and residue decomposition in WEPS. The weather generator of WEPS consists of the programs WINDGEN and CLIGEN as well as a user interface and is capable of simulating needed weather variables on a daily basis and wind speed on a subdaily (eg. hourly) basis. WINDGEN is the program that simulates wind speed and direction for WEPS for approximately 600 locations in the USA. It was developed specifically for use with WEPS and stochastically simulates wind direction and maximum and minimum wind speed on a daily basis. In addition, WINDGEN provides the hour at which the maximum wind speed occurs for each day based on historical records. Subdaily wind speeds are generated within WEPS. CLIGEN is the weather generator developed for the Water Erosion Prediction Project (WEPP) family of water erosion models. It is used with WEPS to generate an average annual air temperature as well as daily precipitation, maximum and minimum temperature, solar radiation, and dew point temperature. Average daily air temperature and elevation for the site are used to calculate average air density within WEPS. Future improvements in weather generation for WEPS include the incorporation of WINDGEN wind generation routines into CLIGEN, expansion of the data base to ~2500 stations in the USA, and improved database manipulation techniques.