Time change of water cycle in Huaihe River Basin

淮河流域水循环时间变化

基本信息

批准号：
07041099
负责人：
KATO Kuranoshin
金额：
$ 4.03万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07041099/
关键词：
Asian monsoon energy and water cycle processes meso-scale cloud and precipitation system Huaihe River Basin in China GAME HUBEX Japan-China scientific collaboration subtropical front

项目摘要

Huaihe River Basin is located where the significant subtropical front, so-called the Meiyu (Baiu) front, stagnates in early summer. Floods and drought occur very often there. HUBEX (Huaihe River Basin Experiment) is one of the sub-project of GAME (GEWEX Asian Monsoon Experiment) and will be carried out from 1996 fiscal year to clarify the water cycle around the basin and its variation toward the establishment of predictability of the floods and the drought there. The present research project was carried out in 1995 fiscal year to clarify and their mechanisms by collaborating between the meteorologists and the hydrologists in Japan and China, as a pilot study of HUBEX.In the HUBEX,we will make intensive field observations in 1998, such as intensive rawinsonde observation for input the regional 4-dimensional data assimilation, three Doppler Radars observation by the Japanese side for producing the Radar-Raingauge Composite Data and for retrieval of thermodynamic fields of meso-beta-scale … More cloud systems, special field observations on interaction processes between land-surface and atmosphere including hydrology, and construction of the coupled meso-scale atmosphere and land-surface model.The present study examined the above mentioned items with use of the data available so far, including the pilot analysis of the case in summer of 1991 when the big flood occurred in the Huaihe River Basin The survey of data and informations was also made with visit of the basin by the Japanese scientists. These results and the future problems were summarized at the HUBEX workshop in Nagoya in March 1996. Main finding are as follows.1) In the flood period in 1991, not only large moisture inflow from the south into the basin persisted, but also effective macro-scale convergence (outflow from the northern boundary was very small) was also remarked. Contribution of local evapotranspiration to the areal precipitation was not so small even in that period.2) Cumulonimbus clusters with remarkable diurnal variation (maximum in the evening) was observed in the several regions adjacent to the Baiu frontal zone in summer of 1979. The role of the surface heating suggested to be rather different among these regions.3) With use of the Doppler Radar observation data together with the conventional ones around the Japan Islands in July 1988, maintenance process of a meso-beta-scale system was clarified by the retrieval of these data. Sensitivity test of the different cumulus parameterization was made for that case.SiBUC (Simple Biosphere Model including Urban Canopy) was contracted and checked by applying for the Biwa Lake basin. The distributed hydrological model, which can predict the river discharge, was also tried to be improved.5) Scheme for evaluating the surface heat and moisture fluxes over land with use of conventional surface meteorological data was contracted. Less

淮河流域位于重要的副热带锋区，即梅雨（白乌）锋区，该地区初夏洪水和干旱频繁发生，HUBEX（淮河流域实验）是GAME的子项目之一。（GEWEX亚洲季风实验）将从1996财政年度开始进行，以澄清流域周围的水循环及其变化，以建立洪水和洪水的可预测性。目前的研究项目是在1995财年进行的，旨在澄清日本和中国的气象学家和水文学家之间的干旱机制，作为HUBEX的试点研究。在HUBEX中，我们将进行深入的实地观测。 1998年，如密集的罗文探空仪观测，输入区域四维资料同化，日方三台多普勒雷达观测，产生雷达-雷轨综合资料，用于反演中观β尺度的热力学场……更多云系统，包括水文在内的地表与大气相互作用过程的特殊野外观测，以及中观尺度大气和地表耦合模型的构建。研究利用目前掌握的数据，包括对1991年夏季淮河流域特大洪水的案例进行了试点分析，并通过流域走访，进行了数据资料的调查。由日本人1996年3月在名古屋举行的HUBEX研讨会上，科学家们总结了这些结果和未来的问题。主要发现如下：1）1991年洪水期间，不仅持续有大量水汽从南方流入流域，而且还指出了有效的宏观尺度收敛（从北部边界流出的流量很小），即使在那个时期，局部蒸散发对区域降水的贡献也不小。2）。 1979 年夏季，在 Baiu 锋带附近的几个区域观察到了具有显着昼夜变化（最大出现在晚上）的积雨云团。表面加热的作用表明这些区域之间的作用相当不同。 3）利用1988年7月，多普勒雷达观测数据与日本列岛周围的常规观测数据一起，通过检索这些数据，阐明了中观β尺度系统的维护过程。针对该情况进行了不同积云参数化的敏感性试验。并尝试将SiBUC（包括城市冠层的简单生物圈模型）应用于琵琶湖流域的分布式水文模型进行验证。 5)利用常规地面气象资料评价陆地表面热湿通量方案有所缩减。