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Water 2016, 8(12), 604; doi:10.3390/w8120604

Riverbed Clogging and Sustainability of Riverbank Filtration

Division of Water Sciences, Faculty of Civil Engineering & Architecture, University of Applied Sciences Dresden, 01069 Dresden, Germany
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Academic Editor: Pieter J. Stuyfzand
Received: 25 October 2016 / Revised: 28 November 2016 / Accepted: 15 December 2016 / Published: 20 December 2016
(This article belongs to the Special Issue Water Quality Considerations for Managed Aquifer Recharge Systems)
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Abstract

Clogging refers to a reduction of riverbed hydraulic conductivity. Due to difficulties in determining the thickness of the clogging layer, the leakage coefficient (L) is introduced and used to quantify the recoverable portion of bank filtrate. L was determined at several riverbank filtration (RBF) sites in field tests and using an analytical solution. Results were compared with data from similar experiments in the early 1970s and 1991–1993. In the 1980s, severe river water pollution in conjunction with high water abstraction led to partly unsaturated conditions beneath the riverbed. A leakage coefficient L of 5 × 10−7 s−1 was determined. After water quality improvement, L increased to 1–1.5 × 10−6 s−1. An alternative, cost and time efficient method is presented to estimate accurate leakage coefficients. The analytical solution is based on groundwater level monitoring data from observation wells next to the river, which can later feed into numerical models. The analytical approach was able to reflect long-term changes as well as seasonal variations. Recommendations for its application are given based on experience. View Full-Text
Keywords: clogging; leakage factor; infiltration resistance; riverbank filtration clogging; leakage factor; infiltration resistance; riverbank filtration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Grischek, T.; Bartak, R. Riverbed Clogging and Sustainability of Riverbank Filtration. Water 2016, 8, 604.

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