書誌事項
- タイトル別名
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- Influence of the Number of Data on the Calculation of Outflow Load by the <I>LQ</I> equation
- LQシキ ニ ヨル リュウシュツ フカリョウ サンシュツ ニ アタエル ソクテ
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Outflow loads were measured using three kinds of watersheds: a forest area (F), an agricultural area without a pig (A) and an agricultural area with many pig farms (P) by an automatic water sampler at intervals of 6 hr for 6 months. Each number of data is 720. From these data, some data (n=6, 12, 18, -----) were picked up using 4 methods: same interval, random, corresponding to discharge and notincluding any storms. Then, the mean of outflow loads were calculated using 4 methods: average by equation (4) (La), revise by flow rate by Eq.(5) (Lw), LQ method by L=aQ+b (straight type) Eq.(3) (Lq1) and LQ method by L=aQb (curved type) (Lq2).<BR>Next, the values of mean X, standard deviation δ and mean squared error e2 were calculated, and squared error ratio E and range ratio R were obtained by Eq.(1) and (2).<BR>Results: 1) LQ method is better than the method of average and revise by flow rate.<BR>2) In the case of NO3-N load by the LQ method, the squared error ratio E is smaller than 10% for the agricultural area when the number of picked up data (n) is larger than 18. In the forest area, it is smaller than 5% when n equals 6 as shown in Fig. 3.<BR>3) A small difference exists between the results calculated by the LQ equation of the straight type and that of the curved type. In the case of a small number of data (n=6), the value of E calculated by the curved type in an agricultural area (A) became large as shown in Fig. 3.<BR>4) In the case of SS, the value of E were so large that it would be impossible to use LQ equation for calculating the outflow load as shown in Fig. 5.
収録刊行物
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- 農業土木学会論文集
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農業土木学会論文集 1993 (164), 1-9,a1, 1993
社団法人 農業農村工学会
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詳細情報 詳細情報について
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- CRID
- 1390282679518650624
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- NII論文ID
- 130004118648
- 10017617741
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- NII書誌ID
- AN00201203
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- ISSN
- 18847234
- 03872335
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- NDL書誌ID
- 3828945
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- JaLC
- NDL
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