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Revising river water quality monitoring networks using discrete entropy theory: the Jajrood River experience

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Abstract

This paper aims at evaluating and revising the spatial and temporal sampling frequencies of the water quality monitoring system of the Jajrood River in the Northern part of Tehran, Iran. This important river system supplies 23% of domestic water demand of the Tehran metropolitan area with population of more than 10 million people. In the proposed methodology, by developing a model for calculating a discrete version of pair-wise spatial information transfer indices (SITIs) for each pair of potential monitoring stations, the pair-wise SITI matrices for all water quality variables are formed. Also, using a similar model, the discrete temporal information transfer indices (TITIs) using the data of the existing monitoring stations are calculated. Then, the curves of the pair-wise SITI versus distance between monitoring stations and TITI versus time lags for all water quality variables are derived. Then, using a group pair-wise comparison matrix, the relative weights of the water quality variables are calculated. In this paper, a micro-genetic-algorithm-based optimization model with the objective of minimizing a weighted average spatial and temporal ITI is developed and for a pre-defined total number of stations, the best combination of monitoring stations is selected. The results show that the existing monitoring system of the Jajrood River should be partially strengthened and in some cases the sampling frequencies should be increased. Based on the results, the proposed approach can be used as an effective tool for evaluating, revising, or redesigning the existing river water quality monitoring systems.

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Authors and Affiliations

  1. Department of Environmental Engineering, University of Tehran, Tehran, Iran

    Najmeh Mahjouri

  2. Center of Excellence for Engineering and Management of Infrastructures, School of Civil Engineering, University of Tehran, Tehran, Iran

    Reza Kerachian

Authors
  1. Najmeh Mahjouri
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  2. Reza Kerachian
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Correspondence to Reza Kerachian.

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Mahjouri, N., Kerachian, R. Revising river water quality monitoring networks using discrete entropy theory: the Jajrood River experience. Environ Monit Assess 175, 291–302 (2011). https://doi.org/10.1007/s10661-010-1512-6

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  • DOI: https://doi.org/10.1007/s10661-010-1512-6

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