Development of the system model of Water Cycle in the Urban Area using Spatial Information

基于GIS的人工水循环模型在东京都区开发。该模型由栅格形式的建筑物和土地利用数据以及矢量形式的排水系统和河流数字数据组成。该模型大致再现了下水管道的流量，并利用该模型对东京都各地区的雨水和再生水回用系统对城市水循环的影响进行了评价。从模型中可以得到许多信息，这些系统的规划和管理，如17%的总用水需求的情况下，这些系统可以取代东京的经济方面的合适的系统在每个地区.另一方面，在甲府市的用水和河流水质的趋势进行了分析，以获得区域水和污染物平衡的基本信息.人均用水量随气温变化而变化。随着污水收集网络的扩展，河溪水质亦有所改善。

The GIS based artificial water cycle model was developed in the Tokyo Metropolitan Area. The model consists of building and land use data with grid form, and digital data of sewerage system and river with vector form. Flow rate of sewer pipes are roughly reproduced in this model.Using this model, the influences of rainwater and reclaimed wastewater reuse systems on urban water cycle were evaluated in each area of Tokyo. From the model, many information for planning and management of these systems were obtained, Such as, 17% of the total water demand in Tokyo can be replaced in the case that the systems intstall the suitable system on economic aspects in each area.On the other hand, the trends of water use and river water quality in the Kofu City are analyzed for getting the basic information on regional water and pollutants balances. The volume of water use per capita changed depending on the temperature change. River water quality was improved as the sewerage network expanded.