Performance of equations for the longitudinal dispersion coefficient: a case study in the Orashi River

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-10-26 DOI:10.2166/wpt.2023.177
Chinedu Ukpaka, Jonah Chukwuemeka Agunwamba
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Abstract

Abstract Investigation of the water quality of rivers is a key point in Water Resources Engineering. The longitudinal dispersion coefficient is one of the foremost significant parameter in river water quality monitoring. Several parameters such as hydraulic, morphology, total dissolved solids, and total suspended solids are effective parameters in the determination of the longitudinal dispersion coefficient as revealed by this study. The assessment of the river shows mean hydraulic and geometric properties such as flow, depth, velocity, longitudinal slope, and width to be 354.17 m3/s, 9.61 m, 0.69m/s, 0.0079,101.63 m and the range of the longitudinal dispersion coefficient as (72-104.4) m2/s. Results obtained by employing the established equations revealed standard error indices and RMSE of the developed equation, and Kashefipour and Falconer (2002) gives correlation coefficient of about 0.819 and 4.182 and 0.421 and 12.186, respectively, as coefficient of determination and RMSE, and they are more accurate among the empirical equations. However, the newly derived equation for the longitudinal dispersion coefficient performed better when compared with others indicating the fitness of the developed equation to estimate Dl.
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纵向色散系数方程的性能:以Orashi河为例
摘要河流水质调查是水利工程中的一个关键问题。纵向弥散系数是河流水质监测中最重要的参数之一。水力、形貌、总溶解固形物、总悬浮物等参数是确定纵向分散系数的有效参数。结果表明,河流的流量、深度、流速、纵向坡度和宽度等水力和几何特性的平均值分别为354.17 m3/s、9.61 m、0.69m/s、0.0079、101.63 m,纵向弥散系数的变化范围为(72 ~ 104.4)m2/s。利用所建立的方程得到的结果揭示了所建立方程的标准误差指标和RMSE, Kashefipour和Falconer(2002)给出的相关系数分别为0.819和4.182,决定系数和RMSE分别为0.421和12.186,在经验方程中更为准确。然而,与其他公式相比,新导出的纵向离散系数方程表现得更好,这表明所开发的方程适合估计Dl。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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