Distributed Hydrological Model (Case Study: Harrach River, Algeria)

摘要

This study aims to simulate multi-heavy metals transport behavior and to improve numerical model accuracy using combination of multi-metals as transportable objects, in order to enhance the strategies for countermeasure to contamination of rivers with heavy metals. In this context, Harrach River contamination with Pb, Hg, Cr, and Zn was quantitatively assessed using Hydrological model with object-oriented design. Transport of dissolved metals were modeled as instances transportable objects. Accumulated metals in sediment were estimated by partition model in assumption of equilibrium state. The model predicted the distribution of metals concentration that originated from industrial wastewater along Harrach River, and presented concentrations values of both metals dissolved in water and accumulated in sediment with acceptable accuracy, i.e. 0.35>R>0.99 and 0.23>R>0.78, respectively, according to correlation with measured data. The observation data with certain reliability in multi-heavy metals could be utilized by combination as apparent calibration data in order to adjust unknown parameters and calculation condition which improves and increases model effectiveness even with few observed datasets. Besides, metal concentration reaction at equilibrium state was suited for predicting metals transport because its chemical interaction between water and sediment is sufficiently faster than metal transport in rivers under observed conditions.