The University of Southampton
University of Southampton Institutional Repository

The use of numerical groundwater model to improve effectiveness of subsurface drainage system in irrigated field

Ampofo, Edward Akwasi (2009) The use of numerical groundwater model to improve effectiveness of subsurface drainage system in irrigated field University of Southampton, School of Civil Education and the Environment, Doctoral Thesis , 157pp.

Record type: Thesis (Doctoral)

Abstract

The research demonstrates that Three-Dimensional Variable-Density Groundwater Flow
models such as the SEAWAT model can be effectively used for design of subsurface
drainage systems for controlling salt concentration in the root zone on salt affected
irrigated land. The SEAWAT model was used to optimize subsurface drainage design to
ensure that the salt concentration of the groundwater at the base of the root zone does not
exceed pre determined levels instead of the conventional approach of maintaining the
groundwater at a predetermined water table level. The study was carried out on a
conceptual uniform homogenous block of irrigated flat field of shallow water table depth
of 0.5 m and salt concentration of 7200 mg/l with impermeable layer at 20 m deep and
impermeable field boundaries. Using the model, spacings were designed to be used as
design criteria for subsurface drainage system to maintain salt concentrations of 6000,
5000 and 4000 mg/l at the base of the root zone and water table depth of 0.8 m from the
soil surface. The results showed that over a wide range of irrigation water quality and
aquifer hydraulic conductivity the optimum drain spacing using SEAWAT was,
depending on irrigation water quality and aquifer hydraulic conductivity, wider by
between 3 and 50 % and the amount of drain discharge reduced by 1 and 27 % than
would be recommended using conventional design equations.

It was concluded that Three-Dimensional Variable-Density Groundwater Flow
models are better for designing effective drainage systems than Conventional drain
spacing design equations such as Hooghoudt.

PDF Ampophothesis.pdf - Other
Download (1MB)

More information

Published date: October 2009
Organisations: University of Southampton

Identifiers

Local EPrints ID: 146869
URI: http://eprints.soton.ac.uk/id/eprint/146869
PURE UUID: 3f8e4c2a-6c00-473b-b289-68de09c8d24c

Catalogue record

Date deposited: 24 Jan 2011 16:04
Last modified: 18 Jul 2017 23:03

Export record

Contributors

Author: Edward Akwasi Ampofo
Thesis advisor: Trevor Tanton
Thesis advisor: David Rycroft

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×