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ON-SITE EXPERIMENTS AND HYDRAULIC EVALUATION ON RUNOFF CONTROL BY RAINWATER STORAGE IN PADDY FIELDS

稻田蓄雨控洪现场试验及水力评价

基本信息

批准号：
18560504
负责人：
HARADA Morihiro
金额：
$ 1.57万
依托单位：
Meijo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560504/
关键词：
rainwater storage paddy field on-site observation runoff analysis flood control design rainfall urbanization kinematic theory 雨水貯留浸透施設

项目摘要

In recent years, flood disasters have become to occur frequently by change of runoff characteristics due to urbanization of a river basin. In order to deal with serious disasters by heavy rainfall, in addition to the river improvement works, construction of the rainwater storage facilities has been planed in many urbanized basins of Japan. However, the preparing plan has not been in progress because construction of such facilities costs high and the suitable building sites are limited. Thereupon, a utilization of paddy fields remained in the suburbs of a city gains attention as an alternative measure for the rainwater storage within a basin. But during a summer as a rainy season, paddy fields are filled with water for the rice fanning. In order to control a flood runoff by utilizing paddy fields, I suggested new methods to improve the rainwater storage function of the paddy fields in this retherch.Generally in a paddy field, there is an inlet aperture from an irrigation channel and an … More outlet aperture to a drainage channel. New suggested methods to substitute paddy fields for rainwater storage facility consist following two procedures.1. To set up the automatic sluice gate with wath-level sensor at the inlet aperture. This equipment can shut inflow water from an irrigation channel by detecting rise of wathrlevel during a rainfall2. To replace a wide weir of the outlet aperture by a narrow weir in order to reduce outflow water to a drainage channel. This method is better than the orifice because it can protect the crops from submergence during an excess heavy rainfall.I have carried out the on-site experiments for some actual paddy fields in the Shinkawa basin, Aichi prefecture, Japan, since 2004. From comparison of wate-levels in paddy field with conventional weir and paddy field with a narrow weir it is clear that the rainwater storage function is improved by the suggested method. Next, for a drainage district that consists of 30 paddy fields, a flood control effect by the improvement in each paddy field is evaluated through the runoff simulation analyses. The runoff model is based on the kinematic wave theory, and the model parameters are identified by observed data in the on-site experiment district. According to the simulation results on the runoff processes from the paddy fields district for a probabilistic design rainfall, it is possible to reduce the peak discharge of outflow largely and to delay the peak time for several hours by contracting the weir width at the outlet aperture. Therefore, I can recognize that the paddy fields become useful as alternative of the flood control facilities by the improvement methods suggested in this research. Less

近年来，由于流域城市化的发展，径流特性发生变化，洪水灾害频繁发生。为了应对强降雨造成的严重灾害，除了河流整治工程外，日本许多城市化流域还计划建设雨水储存设施。然而，由于建造这些设施的成本高昂，而合适的建筑场地有限，因此该计划尚未进行。因此，利用城市郊区剩余的稻田作为流域内雨水储存的替代措施而受到关注。但是在雨季的夏天，稻田里充满了水，可以用来种稻子。为了利用稻田控制洪水径流，本文提出了提高稻田蓄水功能的新方法，即在稻田中设置一个灌溉渠道的进水孔， ...更多信息出口孔到排水通道。新建议的以水田代替雨水储存设施的方法包括以下两个步骤。在进水口设置带水位传感器的自动闸门。该设备可以通过检测灌溉期间水位的上升来关闭来自灌溉渠道的流入水2。用窄堰代替出口孔的宽堰，以减少流出到排水通道的水。这种方法比孔口法更好，因为它可以保护作物在过量的暴雨期间免受淹没。我从2004年开始在日本爱知县新川流域的一些实际稻田进行了现场试验。通过对常规堰和窄堰稻田水位的比较，可以看出该方法提高了蓄水功能。其次，以一个由30块水田组成的排水区为例，通过径流模拟分析，对每块水田的改良防洪效果进行了评价。径流模型以运动波理论为基础，利用现场试验区实测资料对模型参数进行了辨识。对概率设计降雨条件下稻田区径流过程的模拟结果表明，通过缩小出水口堰宽，可以大幅度降低出流洪峰流量，并使洪峰时间推迟数小时。因此，我可以认识到，通过本研究中提出的改进方法，稻田成为有用的防洪设施的替代品。少

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Runoff Analysis on Flood Control Effect by Rainwater Storage in Paddy Fields -Based on the On-site Experiments in the Shinkawa Basin-

稻田蓄雨防洪效果径流分析——基于新川流域现场试验——

DOI：
发表时间：
2008
期刊：
J. of Research Institute of Meijo University(under printing)(in Japanese) No.7
影响因子：
0
作者：
Morihiro HARADA;Akihiro NUMAZU;Mikio OHMORI;Tomio MORI
通讯作者：
Tomio MORI

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