摘要
根据1984年至1987年阿克苏水平衡站潜水蒸发量及水面蒸发量资料,分析了潜水蒸发的变化规律,并建立了新的潜水蒸发经验公式。研究结果表明:现有的经验公式均认为潜水蒸发强度跟大气蒸力的一次方成正比,公式结构不合理。实际上,潜水蒸发强度先是随着大气蒸发力的增大而增大,当大气蒸发力达到临界值后,潜水蒸发强度趋于一定值;原常用的中公式所需参数多而不易准确得到,其中参数η值随着埋深增加而减小,而不应为一固定的经验常数。该文建立的经验公式结构合理,物理意义明确,计算较简单。
Based on experimental data at the Arkesu water balance experimental station in 1984 to 1987, the variation laws of phreatic evaporation were analysed, the empirical formulae for calculating the phreatic evaporation were presented. The results show that C-H Type Formula suposes that the phreatic evaporation is proportional to the atmosphere evaporation capacity. But in fact, as for a given phreatic depth, when the atmosphere evaporation capacity is small enough, the phreatic evaporation increases with the atmosphere evaporation capacity, after the atmosphere evaporation capacity reaching the critical atmosphere evaporation capacity, the phreatic evaporation is close to a constant, limited phreatic evaporation E_( max ). It is difficult to determine the parameter of present formula given by Tsinghua's scholar, and its parameter η decreases with the phreatic water depth, and it is not a constant. For the new empirical formula, its construction is reasonable, its conception is explicit, and its calculation is easier than the former formula.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2004年第2期49-53,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重大基础性研究973项目(编号G1999043506)
863计划(编号2002AA2Z4201)
国家科技攻关计划(编号2002BA901A36)
中国科学院"西部之光"项目
关键词
塔里木盆地
潜水蒸发
替水蒸发系数
计算方法
Tarim River basin
phreatic evaporation from bare soil
phreatic evaporation coefficient
atmosphere evaporation capacity
calculation method
