Analysis of Sensible Heat Flux over Hilly Land in Sichuan Basin

The sensible heat fluxes are analyzed by using LAS (Large Aperture Scintillometer) over hilly land in Sichuan Basin and meteorological observations from 2000 to 2007.The results show that the average sensible heat fluxes change regularly in daytime, increasing gradually after sunrise and reaching the maximums around 13:00, then decreasing gradually.The fluxes for the rainy days are influenced greatly by precipitation.The fluxes are smaller for the rainy days than the days with no precipitation.For the days without rain the highest peak value of the monthly average sensible heat fluxes occurs in August, the lower peak value occurs in May and the lowest value occurs in January.For the rainy days the highest value occurs in April, the lower occurs in July and the lowest occurs in December.The maximal difference between the rainy days and the days without rain occurs in September.Both the minimum for the drought days and normal days occur in January.The peak value is in August for the drought days or in April for the normal days.The obvious difference between drought days and normal days occurs in Jun to October.The more serious the drought is, the more the difference between drought and normal is.The average sensible heat for the drought days is bigger than the normal days at the same time.