Development of an on-site prediction model for forest roads and timber harvest areas

Robichaud, P.R.; Foltz, R.B; Luce, C.H. 1993. Development of an on-site prediction model for forest roads and timber harvest areas. In: Hadley, R.F.; Mizuyama, T. (eds.). Sediment problems: Strategies for monitoring, prediction and control. Proceedings of the Yokohama Symposium, July 1993. IAHS Publ. No. 217. 135-140.

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Abstract: The paper describes the development of a process-based model which is based on the Water Erosion Prediction Project (WEPP) model developed for agricultural and range land. The model is intended primarily for forest roads and disturbed harvest areas. Parameter estimation techniques from field and laboratory methods are described.

USDA.s Water Erosion Prediction Project (WEPP) was initiated to predict sheet and rill erosion and to calculate annual sediment production on crop and rangelands. WEPP has been developed to replace the Universal Soil Loss Equation. Efforts are under way to extrapolate the WEPP cropland and rangeland model to forest areas. The development of a weather simulator is described, which will be capable of estimating weather parameters without nearby weather records. Model parameterization is described for road construction and timber harvest, based on field experiments. Parameters being addressed include: runoff flow in wheel ruts and drainage ditches; the effects of gravel surfaces, mulches on fillslopes, rock blankets in drainage ditches, and tire pressure; and the effects of site preparation on the residual root mass.

Moscow FSL publication no. 1993c