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The effectiveness of artificial recharge in combating seawater intrusion on the Salalah Coastal Aquifer, Oman
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2008 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 55, no 1, 191-204 p.Article in journal (Refereed) Published
Abstract [en]

The Salalah central sewage treatment plant has been designed to treat 20,000 m(3)/day at the first stage and two further stages to double the initial capacity. The plant currently (2005) treats more than 15,000 m(3)/day effluents to a tertiary level, and after chlorination phase, the effluents are recharged into tube wells in a line parallel to the coast. The process aims to help stabilize the seawater interface and a part to be recovered from hand-dug wells/boreholes further inland and downstream. A three-dimensional flow and solute advection transport model was developed to assess the effectiveness of the proposed recharge scheme and to track the solute transport with respect to the design system. The advection transport model predicted that in 2020 the maximum pathlines of the injection fluids would reach the abstraction wells that are located 600 m, southward of the injection bores in about 1-year travel time in the case of the no-management interference and more than that southward under management interference. The developed flow predicted the wedge of the saline intrusion in 2019 is tracked up to 2.7 and 3.4 km from the shoreline with the injection and without the injection, respectively under constant underflow. The injection scheme is effective in pushing back the saline zone front by 700 m. This study argues that the treated wastewater would help to increase the water levels at the vicinity of the injection line and to reduce the influence of saline inflows from the coast. The reclaimed sewage recharge scheme is examined in the case of the Salalah coastal aquifer using groundwater simulation, which can also be applied to other regions with similar conditions.

Place, publisher, year, edition, pages
2008. Vol. 55, no 1, 191-204 p.
Keyword [en]
Artificial recharge; Injection bores; Salalah coastal aquifer; Treated municipal sewage and salinity; Chemical modification; Groundwater geochemistry; Sewage; Sewage treatment plants; Coastal aquifers; sea water intrusion; artificial recharge; borehole; chlorination; coastal aquifer; effluent; hydrological modeling; recharge; saline intrusion; shoreline; solute transport; waste treatment
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7150DOI: 10.1007/s00254-007-0975-4ISI: 000256473900019Scopus ID: 2-s2.0-44949253978OAI: oai:DiVA.org:kth-7150DiVA: diva2:12071
Note
QC 20100818. Uppdaterad från Accepted till Published 20100818.Available from: 2007-05-20 Created: 2007-05-20 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Sustainable management of the Salalah coastal aquifer in Oman using an integrated approach
Open this publication in new window or tab >>Sustainable management of the Salalah coastal aquifer in Oman using an integrated approach
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Most of the coastal areas around the globe depend on coastal aquifers vulnerable to salt water intrusion. The Salalah plain in southern Oman is underlain by a shallow limestone aquifer extending north up to the foot of the Jabal AlQara which reach a height of about 1000 m. A major part of the recharge to the aquifer is through fog condensation on the forest on the upper slopes of the mountain. Increasing population and water use for agriculture has caused limited salt-water intrusion. There is an urgent need for management of the aquifer to avoid further intrusion. A numerical flow model was developed for the Salalah coastal aquifer using both the MODFLOW and the MT3DMS computer codes to study the present water flow and future water turnover, the latter under different scenarios. The fog collecting forest is under threat due to the browsing of herds of camels. Recharge of treated wastewater is a management measure already in operation. Other management options considered, are restrictions on the use of water in irrigation and improvements in irrigation practices. Still another measure is reforestation of Jabal AlQara.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xii, 22 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 2007:1031
Keyword
groundwater, cosatal aquifer, salt water instrusion, fog, modelling
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-4384 (URN)978-91-7178-645-6 (ISBN)
Public defence
2007-05-29, V1, KTH, Teknikringen 76, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20100817Available from: 2007-05-20 Created: 2007-05-20 Last updated: 2010-08-18Bibliographically approved

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