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Studies on water balance in the northern area of Okinawa Island

冲绳岛北部地区水平衡研究

基本信息

批准号：
10660235
负责人：
YOSHINAGA Yasutoshi
金额：
$ 0.51万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660235/
关键词：
air borne measurement surface covering substances emissivity of earth surface substances air transmissivity heat balance method evapotranspiration rainfall water balance 蒸発散量

项目摘要

Measurements of the surface temperature of the northern area of Okinawa Island was made with the air borne INFRA IMAGER observation in three seasons, the first on 7 Feb.(Winter), on the second 13 July(Summer) and the last on 10 Dec., 1999. The area averaged uncorrected measured values of the earth surface temperature are 18.0, 30.4 and 19.5 and changes in the range of 6.3, 8.3 and 7.6 degree in centigrade, respectively.Correction that should be made to the above uncorrected values due to the effects of the air transmissivity and the emissivity of the earth surface coverint substances underlying the aircraft is found to be an addition of 3 to 4 degree.Water balance for an example case of 1997 showed for the same northern area showed that the averaged annual rainfall and evapotranspiration amount, respectively, to 2220mm and 1070mm, resulting in the discharge of water being about 50% of the rainfall.

用机载INFRA IMAGER观测仪对冲绳北方地区的地面温度进行了三个季节的观测。（冬季），第二个7月13日（夏季）和最后一个12月10日，1999.地表温度的面积平均未校正实测值分别为18.0、30.4和19.5，变化范围为6.3、8.3和7.6 ℃，由于空气透过率和飞机下面的地表覆盖物的发射率的影响，对上述未修正值应作的修正被认为是以1997年为例进行的水量平衡计算表明，同一北方地区的年平均降雨量和蒸散量分别为2220 mm和1070 mm，导致排水量约为降雨量的50%。