Shogo Sugahara, H. Kamiya, Toshiaki Esumi, Y. Tabayashi, Y. Seike
{"title":"Reduction of nutrient loads to Lake Shinji by flood control channel","authors":"Shogo Sugahara, H. Kamiya, Toshiaki Esumi, Y. Tabayashi, Y. Seike","doi":"10.3739/RIKUSUI.77.315","DOIUrl":null,"url":null,"abstract":"We calculated the changes in the amount of water, total nitrogen ( TN ) , and total phosphorus ( TP ) flowing into Lake Shinji, through a hypothetical flood control channel, using the flow rate data from 1984 to 2013 and L-Q equations developed for the Hii River. Our estimates indicate that in the presence of such a channel, the total water flow into Lake Shinji would be reduced by 1.6%, and TN and TP loads would decrease by 2.8% and 8.9%, respectively. This implies that the concentration of TP has a greater dependence on the flow rate than the concentration of TN. From 2003 to 2014, the ratio of TN to TP at the center of Lake Shinji was 10 to 1. Our results suggest that the operation of a flood control channel would increase this ratio and may cause diatoms to overtake the blue-green algae as the dominant algae in Lake Shinji.","PeriodicalId":35602,"journal":{"name":"Japanese Journal of Limnology","volume":"77 1","pages":"315-320"},"PeriodicalIF":0.0000,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Japanese Journal of Limnology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3739/RIKUSUI.77.315","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Environmental Science","Score":null,"Total":0}
引用次数: 0
Abstract
We calculated the changes in the amount of water, total nitrogen ( TN ) , and total phosphorus ( TP ) flowing into Lake Shinji, through a hypothetical flood control channel, using the flow rate data from 1984 to 2013 and L-Q equations developed for the Hii River. Our estimates indicate that in the presence of such a channel, the total water flow into Lake Shinji would be reduced by 1.6%, and TN and TP loads would decrease by 2.8% and 8.9%, respectively. This implies that the concentration of TP has a greater dependence on the flow rate than the concentration of TN. From 2003 to 2014, the ratio of TN to TP at the center of Lake Shinji was 10 to 1. Our results suggest that the operation of a flood control channel would increase this ratio and may cause diatoms to overtake the blue-green algae as the dominant algae in Lake Shinji.
期刊介绍：
The Japanese Society of Limnology was founded in 1931 for the purpose of promoting and fostering the study of limnology in the broad meaning of the term. It publishes quarterly "The Japanese Journal of Limnology" and holds an annual meeting consisting of lectures, discussions and symposiums on limnological subjects.
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