DOCUMENTATION AND APPLICATION OF SCEHM A Model for Soil Chemical Exchange of Heavy Metals

摘要

SCEHM, a computer model simulating the transport of heavy metals through the soil system in a forested watershed, has been developed and linked with the Terrestrial Ecosystem Hydrology Model. SCEHM deals with the deposition, infiltration, exchange, and flow of particulates emitted from a smelter. Particulates are deposited onto the litter layer, dissolved and infiltrated into the soil according to a solubility constant, exchanged with the soil by using a simple Kd relationship, and transported through the soil by moisture movement.nThe model is applied to Crooked Creek Watershed to simulate the six-year build up of lead, cadmium, zinc, and copper around a lead smelter.