关键词: 折算系数, 小型蒸发器, 20m²水面蒸发池, 水面蒸发, 塔里木河流域

Abstract: The paper evaluated the evaporation conversion coefficient from 20 cm pan to 20 m² pool based on the climate data synchronously observed in Shangyou reservoir from 1982 to 1987 and in Tamen town from 2000 to 2002; analyzed the coefficient s changing characteristics. The evaporation conversion coefficients of the above two regions are compared with that of Hadipo in north Xinjiang and that in Xinjiang-Mongolia region. The results showed that the water surface evaporation intensity is small during the freezing period, but can't be neglected. The conversion coefficient increases month by month during the freezing period, yearly change is small, but has a trend of decreasing year to year. The study results can provide references for water balance research, water resources evaluation, and ecological water demand calculation in Tarim river basin.

Key words: conversion coefficient, 20 cm evaporation pan, 20 m² evaporation pool, water surface evaporation, Tarim river basin