Research on material, water, and money flow in Lake Suwa-Tenryu River Area

经济分析小组分析了福冈市的报纸回收业务模式和秋田的食用油回收业务模式这两个环境社区业务的开创性项目。前一种模式是构建共存的社区系统的实验，后一种模式是根据风险公司的利益构建地方能源循环的实验，风险公司比公共企业受到的法律限制更少。社会系统组使用统计数据和遥感技术（LANDSAT TM）分析了Suwa-Tenryu地区的地方社区发展。30年前修建的“金星线”收费公路，使旅游业发展，总收入增加，但随着游客的增加，草地遭到破坏，垃圾和粪便增加。除了行政措施外，非营利组织和公民的合作对这些过度使用问题也很重要。自然调查小组继续分析了天龙河分支的物质循环，研究了天龙河主河道沿着地下水硝酸盐污染，并对河口海岸砂的粒度分布进行了调查。建立了一种新的河水中硅酸盐的定量测定方法。光合色素和藻类组成进行了分析，从湖的沉积物芯收集。还分析了整个湖泊表面沉积物的TBT。摇蚊的出现时间受水温的影响很大，近年来其数量呈下降趋势。工程组分析了水铝英石对苯甲醛的吸附特性，改进了木屑对有毒物质的净化系统，并建立了硝酸盐污染地下水的模拟模型。

Economical analysis group analyzed two examples of pioneering projects on environmental community business : business model on newspaper recycling in Fukuoka and business model on recycling of cooking oil in Akita. The former model is an experiment in constructing a community system for coexistence, and the latter one is a trial for constructing energy cycling in a local area in accordance with the benefit of venture companies, which are legally less restricted than public enterprises.Social system group analyzed the development of local communities in Suwa-Tenryu Area by using statistical data and remote sensing techniques (LANDSAT TM). The toll road of "Venus Line", which was constructed 30 years ago, caused development of tourism and increase in gross income, and destruction of grassland and increase in trash and excreta accompanying with the increase of tourists. In addition to the administrative measures, NPO and citizens' cooperation are important for those overuse problems.Natural survey group continued an analysis of material cycling in a branch of the Tenryu River, studied groundwater nitrate pollution along the main channel of the river, and conducted a survey on the size distribution of coastal sands at the mouth of the river. A new quantitative measurement of silicate in river water was established. Photosynthetic pigments and algae composition were analyzed for the sediment cores collected from Lake Suwa. TBT was also analyzed for surface sediment of the entire lake. Emerging time of a chironomid was greatly affected by waterr temperature, and their number showed a decreasing trend in recent years in Lake Suwa.Engineering group analyzed adsorption properties of benzaldehyde on allophane, improved purification systems for toxic substances by using wood chips, and developed a simulation model of groundwater pollution by nitrate.