Rainfall Infiltration Characteristics for a Semi-Arid Watershed Soil.

摘要

Rainfall infiltration characteristics for a semi-arid watershed soil were studied. The soil examined was obtained from Page Ranch, 25miles north of Tucson,AZ. Laboratory infiltration tests were conducted on reconstructed soil profiles similar to those on the watershed. A mathematical model of infiltration was used to simulate the infiltration process. Results from infiltration tests conducted on site at the watershed during a previous research study were also simulated using the infiltration model. Laboratory and field infiltration tests were conducted using a realistic rotating disk rainfall simulator. Single-and dual-source gamma ray attenuation techniques were used to obtain soil moisture measurements within the laboratory soil profiles. By changing the saturated conductivity of the upper soil layer,it was also possible to simulate the infiltration process on a grass-covered field plot.