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Optimal Land Use Toward a Less Hazardous Region by Agricultural Land Consolidation

通过农地整合优化土地利用，减少危险区域

基本信息

批准号：
63460210
负责人：
YASUTOMI Rokuro
金额：
$ 4.74万
依托单位：
Tokyo University of Agriculture and Technology (1989-1990)Ibaraki University (1988)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

Paddy fields which are located in mountainous district are easily damaged by storms. The damage consists of flood and land slide. The 70% of damaged areas is found in the topographic inclination of 1/10 to 1/20. Paddy fields in alluvial plain are damaged by flood. An investigation was carried on finding the difference of damage between before and after the agricultural land consolidation in the region where the foods are often taken place. The covering speed of flood went slow while the speed of drainage from the inundation area was increased remarkably after land consolidation. These effects suggest that the paddy field inundation prevents the dense populated area of city from flood.The retarding basin is often used as agricultural land which is owned by farmers so that they are suffering man-made flood for preventing the area on down-stream from flood.Small agricultural reservoirs which are located in suburbs for irrigation are being converted to non agricultural land use, residential area and shopping area. The flood often attacks these areas wher have no prevention facilities.It could be evaluated from the surveys that the farm land contributes to the public security against the food if the farm land is well managed and ready for the accommodation of flood water after the consolidation. Optimal land use is important for regional planning to make a less hazardous region.The fundamental researches for the erosion mechanism have been done by the several titles ; Slaking test of compacted volcanic ash soil ; Study on the flocculation and coagulation properties of volcanic ash soil ; Physico-chemical properties of allophane and imogolite ; Study on the thixotropy of montmorillonite ; Decrease of water conductivity by filling of the micro-pores in soil.The optimal land use will be realized using the hybrid knowledge of both topographical land use and erosion prevention technique.

地处山区的稻田易受暴风雨的破坏。灾害包括洪水和滑坡。在1/10 ~ 1/20的地形倾角范围内，有70%的破坏区。冲积平原上的稻田被洪水毁坏了。通过对粮食生产高发区的调查，分析了整理前后粮食作物的危害差异。土地整理后，淹没区的淹没速度变慢，而排水速度明显加快。这些影响表明，稻田淹没使城市人口密集区免受洪水侵袭;滞洪池常被用作农民所有的农业用地，使农民遭受人为洪水，以防止下游地区遭受洪水;位于郊区的小型农业水库用于灌溉，正在转变为非农业用地、居民区和购物区。洪水经常袭击这些没有防洪设施的地区，从调查中可以评估，如果整理后的农田管理良好，并具备容纳洪水的条件，则农田对公共安全和粮食安全的贡献。火山灰土壤侵蚀机理的基础性研究主要有以下几个方面：压实火山灰土壤的湿化试验;火山灰土壤的絮凝和凝聚特性研究;水铝英石和伊毛戈兰石的理化性质研究;蒙脱石的触变性研究;火山灰土壤侵蚀机理的研究。通过填充土壤中的微孔隙来降低水的传导性。利用地形土地利用和侵蚀预防技术的混合知识来实现土地的优化利用。