Comparison of measured and calculated loads using quadratic LQ equation for Hii River flows, eastern Shimane Prefecture, Japan

Q4 Environmental Science

Japanese Journal of Limnology Pub Date : 2014-01-01 DOI:10.3739/RIKUSUI.75.151

T. Miyazako, Shogo Sugahara, Y. Tabayashi, H. Ohshiro, Y. Koyama, Y. Nakashima, H. Kamiya, Y. Seike

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引用次数: 8

Abstract

We sampled river water from 1 July 2010 to 30 June 2011 in the Hii River. Suspended solids (SS), chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) showed increasing trends during floods. In contrast, dissolved silica (DSi) had a decreasing trend during floods. By comparing estimated loading amounts from a loading-flow (LQ) equation and actual loading amounts from multiplying a given day s chemical species and discharge, TN, nitrate and D-Si showed quantitative agreement between the two estimations. However, loading amounts of SS, COD, TOC, TP and phosphate from a linear LQ equation had lower values than those of actual loadings. The reason for such underestimation is an increased concentration of certain chemical species during flooding or high discharge. Therefore, we applied quadratic or cubic LQ equations. After applying the quadratic LQ equation to certain chemical species that showed low coefficients of determination, values improved. For more accurate loading amounts from an LQ equation, we require observation data from periods of high discharge.

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日本岛根县东部Hii河流量二次LQ方程实测与计算荷载的比较

我们从2010年7月1日至2011年6月30日对Hii河的河水进行了采样。悬浮物(SS)、化学需氧量(COD)、总有机碳(TOC)、总氮(TN)和总磷(TP)在洪涝灾害中呈增加趋势。洪水期间，溶解二氧化硅(DSi)呈下降趋势。通过比较负荷-流量(LQ)方程估算的负荷量和乘以给定日化学物质和排放量的实际负荷量，TN、硝态氮和D-Si在两种估计之间显示出定量一致。线性LQ方程计算的SS、COD、TOC、TP和磷酸盐的负荷量均低于实际负荷量。造成这种低估的原因是在淹水或高流量期间某些化学物质的浓度增加。因此，我们采用二次或三次LQ方程。将二次LQ方程应用于某些决定系数较低的化学物质后，结果有所改善。为了从LQ方程中获得更准确的载荷量，我们需要高放电时期的观测数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Japanese Journal of Limnology Environmental Science-Ecology

CiteScore

0.20

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0.00%

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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.