Comparative Study of River and Water Resources in South-East Asia and the Pacific and Establishment of Data Base

近年来，东南亚和太平洋地区的一些国家发生了严重的洪涝灾害。造成这些特大洪涝灾害的原因除了气象变化外，还与高度城市化导致的土地利用格局变化有关。自然入渗面积的减少和不透水区域的扩大影响了城市地区的水循环，导致峰值流量增加，河流低流量减少。通过数据分析和野外观测，分析了城市化对水循环的影响。在这些研究中，对水资源基础信息和水文资料进行整理是非常重要的。东南和太平洋的河流目录已出版，这对这些地区的比较研究是有用的。亚洲FRIEND可以用于我们的研究工作，然后我们支持AP-FRIEND的活动。本课题组使用River目录中指定的数据集进行比较和过程研究。1)城市水文循环及其改善措施。2)城市化进程与气象变化引起的降水趋势长期分析。3)收集整理日本河流流域数字数据集，建立日本河流数据库网络。(4)国外研究者对《河流目录》第3.5卷进行了河流资料的收集和整理。)对几个国家进行了实地观测，收集了基础资料，并对河流和水文特征进行了比较研究。6)建立数据网络和AP-FRIEND（Flow Regimes International Experimental and network data）。(7)考察中国98年代长江洪涝灾害，并与日本的洪涝灾害进行比较。

In these years , the heavy flood disasters were occurred at several countries in South-east Asia and the Pacific. The reasons of these heavy flood disasters were not only by meteorological change but also by land use pattern change caused by highly urbanization. The loss of natural infiltration areas and expansion of impervious areas affect the water cycle in the urban areas resulting in increased peak discharges and reduced river low flows. Impact of urbanization on hydrological cycle were analyzed through the data analysis and field observation.For these research , it is important to arrange the basic information of water resources and hydrological data. The river catalogues for South-east and the Pacific were published and it is useful for comparative study in these regions. The Asian FRIEND can be used for our research works, then we supports the activity of AP-FRIEND .This research group proceed the comparative and process research using data sets nominated in River catalogue.1)Urban hydrological cycle and its improvement measures.2)Long term analysis of precipitation trend caused by urbanization process and meteorological change.3)Collection and arrangement of river and basin digital data set for establishment of data base network in Japan rivers.4)Foreign investigator proceed the collection and arrangement of river data for River catalog Vol.3.5)Field observation of several countries were performed and collect the basic data and proceed the comparative study of river and hydrological characteristics.6)Flame establishment of data network and AP-FRIEND(Flow Regimes International Experimental and Network Data).7)Investigate the 98s flood disaster of Changjiang River in Chaina and compared to Japan flood disaster.