Hydrological Environment in Southeast Asia

到目前为止，对1998年眼压的初步研究和准备工作如下：1)在清迈TMD站上安装了雨滴分布和雨强测量装置，该站位于BRAA的Om Koi雷达范围内。2)1996年5-6月和1997.3-9月在班合角、清迈和乌邦-拉查塔尼TMD站分别进行了为期4周、每天4次的初步增强测风观测，对湄南河流域典型的土地覆盖类型之一的旱田建立了一个配有10m PBL塔和探空点的观测基地。苏可泰。在该观测基地进行了AWS/GAME-PAM业务试验、波文比、涡旋相关法和带通协方差法估算地表通量的比较、每天4-8次频率的增强探空仪观测等初步研究。4)在清迈附近的库格马森林水文实验分水岭建造了一座50m的PBL塔，并于2月中旬开始初步观测。1997.5)在Sukhothai地区周围开展了各种类型土地覆盖的流动观测，计划对固定通量观测进行补充。6)已开始为湄南河流域开发中尺度大气模式和分布式水文模式。

Preliminary studies and preparatory works done so far towards IOP in 1998 are as follows ;1) A disdromater which measures rain drop distribution as well as rainfall intensity was installed at Chiang Mai TMD station located in the range of Om Koi rader of BRRAA.2) Preliminary enhanced rawinsonde observations with a frequency of 4 times a day were carried out at Banhkok, Chiang Mai and Ubon Ratchathani TMD stations for 4 weeks from May to June and from August to September respectively in both 1996 and 1997.3) For non-irrigated paddy fields which are one of typical land cover types in the Chao Phraya river basin, an observational base equipped with a 10m PBL tower and a sonde releasing site was established at west Sukhothai. Sukhothai. Some preliminary studies such as operational test of AWS/GAME-PAM,comparison in durface flux estimation among Bowen Ratio, Eddy Correlation and Band-Pass Covariance methods, enhanced rawinsonde observations with a frequency of 4-8 times a day, etc.were carried out at this observational base.4) A 50m PBL tower was constructed at Kog Ma forest hydrologic experimental watershed of KU near Chiang Mai, and preliminary observations were started from the middle of February, 1997.5) Mobile observations for various types of land cover which are planned to complement the fixed flux observations were carried out around Sukhothai area.6) Development of meso-scale atmospheric model and distributed hydrologic model for the Chao Phraya river basin has been initiated.