关键词: 黄河流域, 夏季旱涝, 陆面蒸发

Abstract: In this paper, an empisical, equation for, estimating the quotient between the monthly sums of sensible anb latent heat fluxes is proposed on the basis of the heat balance data measured during 1958-1960 period at Beijing and Zhenzhow,And the monthly evaporation sums for the months from May to August are estimated with the equation by using an eight-year routine meteorological data in the yellow River Valley. Finally the relationship between the monthly evaporation and precipitiation deviation (%) is discussed.The main results are found as following.1) The errors of the total evaporation rn summer computed with Fq.5 and Eq.7 to those obtained from 《Atlas of water Climatology of China》 are about -10% for most of the stations in Tab.2.2) The monthly evaporation amounts for the drought years (1972,1975,1986) range from 12.6 to 30.1 KJ·cm^-2 and those for the flood year(l988) is from H.2 to 25.1 KJ·cm^-2.3) The summery evaporation amounts in the drought year are greater than that in flood year in area 1, but on the contrary, those for the drought year in area 3 are less.4) The evaporation amounts in summer increase with increasing precipitation sums for the drought year, but do not show consistent trend for the flood year.this is because the effects of precipitation deviation on evaporation in the eastern.part of the studied area are different from; those in the western part for the flood summer.

Key words: Yellow river valley, Drought/flood in summer, Evaporation from land