| Item type |
紀要論文01 / Departmental Bulletin Original Article(1) |
| 公開日 |
2019-03-22 |
| タイトル |
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|
タイトル |
四万十川の一流域における流量, および窒素, リン, 無機イオン負荷量の日単位連続評価法 |
| タイトル |
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|
タイトル |
A Method for Evaluating Continuous Daily Discharge, Loads of N, P, and Inorganic ions in a Watershed on the Shimanto River Basin, Shikoku, Japan |
|
言語 |
en |
| 言語 |
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|
言語 |
jpn |
| キーワード |
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主題Scheme |
Other |
|
主題 |
catchment |
| キーワード |
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主題Scheme |
Other |
|
主題 |
concentration |
| キーワード |
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|
主題Scheme |
Other |
|
主題 |
data complementing method |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
forested area extending method |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
river |
| キーワード |
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|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
catchment |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
concentration |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
data complementing method |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
forested area extending method |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
river |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
| ID登録 |
|
|
ID登録 |
10.24514/00001648 |
|
ID登録タイプ |
JaLC |
| 著者 |
吉田, 正則
村上, 敏文
吉川, 省子
藤原, 伸介
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| 抄録 |
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内容記述タイプ |
Abstract |
|
内容記述 |
In the Shimanto River basin, Shikoku, Japan, agricultural activities are suspected to lead pollution in water quality of the Shimanto River. However, causal relationship between the agricultural activities and the water quality is not evident. So, we developed a method for evaluating continuous daily discharge and effluent loads of N, P, and inorganic ions to analyze their effluent characteristics in a watershed (815 ha) located on the Shimanto River basin. The results are as follows. 1) As for discharge and concentration, complement of continuous daily data from discontinuously measured data such as once at two weeks or from automatically measured ones including failed-observation periods was revealed to be practicable by a method we designed in the present paper. "Systematic biases" arising in the complemented values were corrected by modification factors defined in each of discharge classes. 2) Relative errors in the complemented values were ±40% for the discharge, from -13% to +30% for the concentration, and ±40% for the effluent load. Cumulative errors when the complemented values linked with automatically measured ones were practically ±17% for the discharge, and ±18% for the effluent load. 3) The discharge and concentration of the whole forested area (622 ha) in the watershed were able to be estimated from the partial forested catchment A (43 ha), using correlative relationships between mean specific discharge, or mean concentration of five forested catchment samples and the complemented discharge of the forested catchment A (forested area extending method). 4) Annual discharge calculated from the data complementing and forested area extending methods was concluded to be an appropriate value, because evapo-transpiration obtained from a subtraction of the complemented discharge from precipitation coincided with that estimated from the automatically measured discharge. |
| 書誌情報 |
近畿中国四国農業研究センター研究報告
en : BULLETIN of THE NATIONAL AGRICULTURAL RESEARCH CENTER for WESTERN REGION
巻 7,
p. 49-69,
発行日 2008-03-11
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| 出版者 |
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出版者 |
独立行政法人 農業・食品産業技術総合研究機構 近畿中国四国農業研究センター |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1347-1244 |
| DOI |
|
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関連タイプ |
isIdenticalTo |
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|
識別子タイプ |
DOI |
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関連識別子 |
10.24514/00001648 |
| 著者版フラグ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
nwarc_report_No7p49-69p.pdf (1.4 MB)
