Studies on the Hydraulic Structure and Water Qualigy Purification in the Agricultural Channel

农业渠道水工建筑物及水质净化研究

基本信息

批准号：
03660241
负责人：
ITAGAKI Hiroshi
金额：
$ 1.41万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

In the study on the hydraulic structure at the agricultural channel, we measured the turbulent flow velocity by the use of the electro-magnetic current meter of the two components. The measurement were conducted over two cases which an aquatic plants are in existence in the agricultural open channel flow and not. By the use of the time series data we calcutated the spectral density function and the curves of R/S.The spectral density function in the region of the high frequency were decreased in the slope of -2.2 at the flow surface and -1.7--1.9 at the flow bottom in the flow shich the aqatic plants were in existence. On the other hand it was -1.66 in the all measurement points of the flow which an aquatic plants were not in existence. From the analysis of R/S, the calcutaion curve was represented by the two lines. Moreover we calculiated the turbulent diffusion coefficients from the auto-correlation coefficeints and the measure of despersion of turbulent velocity.In the study on the purification of the water quality, we conducted two experiments. The first experiment was concered to the self-purification of the water quality. From this experiment we analyzed a suspened solid, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, total nitrogen and total phosphate over a one week or two weeks period. By the analysis of the water quality, we calculated the removal velocity coefficients of the biochemical oxygen demand and the costants of the reaction speed of the organic nitrogeneous matter from NH_4^+-N to NO_2^--N and from NO_2^--N to NO_3^--N.The second experiment was studied for the artificial purification of the water quality by the use of crushed stone. This apparatus was very effective for the purification of the water quality in the agricultural channel flow.

在农用渠道水工建筑物研究中，我们利用两种构件的电磁流量计测量了湍流流速。对农业明渠水流中存在水生植物和不存在水生植物的两种情况进行了测量。利用时间序列数据计算了谱密度函数和R/S曲线。高频区域的谱密度函数在流面处以-2.2的斜率减小，在-1.7-- 1.9 水流底部存在水生植物。另一方面，在不存在水生植物的所有流量测定点中，结果为-1.66。从R/S分析，计算曲线由两条线表示。并根据自相关系数和湍流速度离散度的度量计算了湍流扩散系数。在水质净化的研究中，我们进行了两个实验。第一个实验涉及水质的自净化。通过该实验，我们分析了一周或两周内的悬浮固体、溶解氧、生化需氧量、化学需氧量、总氮和总磷酸盐。通过对水质的分析，计算了NH_4^+-N到NO_2^--N和NO_2^--N有机含氮物的生化需氧量去除速度系数和反应速度常数。为NO_3^--N。第二个实验研究了利用碎石对水质进行人工净化。该装置对于农田水流水质的净化非常有效。