Cho Kyung Hwa, Lee Seungwon, Ham Young Sik, Hwang Jin Hwan, Cha Sung Min, Park Yongeun, Kim Joon Ha
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 500-712, South Korea.
Water Sci Technol. 2009;59(11):2197-203. doi: 10.2166/wst.2009.259.
The present study proposes a methodology for determining the effective dispersion coefficient based on the field measurements performed in Gwangju (GJ) Creek in South Korea which is environmentally degraded by the artificial interferences such as weirs and culverts. Many previous works determining the dispersion coefficient were limited in application due to the complexity and artificial interferences in natural stream. Therefore, the sequential combination of N-Tank-In-Series (NTIS) model and Advection-Dispersion-Reaction (ADR) model was proposed for evaluating dispersion process in complex stream channel in this study. The series of water quality data were intensively monitored in the field to determine the effective dispersion coefficient of E. coli in rainy day. As a result, the suggested methodology reasonably estimates the dispersion coefficient for GJ Creek with 1.25 m(2)/s. Also, the sequential combined method provided Number of tank-Velocity-Dispersion coefficient (NVD) curves for convenient evaluation of dispersion coefficient of other rivers or streams. Comparing the previous studies, the present methodology is quite general and simple for determining the effective dispersion coefficients which are applicable for other rivers and streams.
本研究提出了一种基于在韩国光州（GJ）溪进行的现场测量来确定有效弥散系数的方法，该溪流因堰和涵洞等人工干扰而环境退化。由于天然溪流的复杂性和人工干扰，许多先前确定弥散系数的工作在应用上受到限制。因此，本研究提出了串联水箱（NTIS）模型和平流-弥散-反应（ADR）模型的顺序组合，以评估复杂河道中的弥散过程。在现场密集监测了一系列水质数据，以确定雨天大肠杆菌中的有效弥散系数。结果，所建议的方法合理地估计了光州溪的弥散系数为1.25平方米/秒。此外，顺序组合方法提供了水箱数量-流速-弥散系数（NVD）曲线，以便于评估其他河流或溪流的弥散系数。与先前的研究相比，本方法在确定适用于其他河流和溪流的有效弥散系数方面相当通用和简单。
