eprintid: 391
rev_number: 12
eprint_status: archive
userid: 7
dir: disk0/00/00/03/91
datestamp: 2011-11-28 15:27:52
lastmod: 2015-05-29 20:00:49
status_changed: 2011-11-28 15:27:52
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Hewitt, I.
creators_name: Lacey, A.A.
creators_name: Mellgren, N.
creators_name: Vynnycky, M.
creators_name: Robinson, M.
creators_name: Cooker, M.
title: Designing a Green Roof for Ireland
ispublished: pub
subjects: environment
subjects: Fluids
studygroups: esgi70
full_text_status: public
abstract: A model is presented for the gravity-driven flow of rainwater descending through the soil layer of a green roof, treated as a porous medium on a at permeable surface representing an efficient drainage layer. A fully saturated zone is shown to occur. It is typically a thin layer, relative to the total soil thickness, and lies at the bottom of the soil layer. This provides a bottom boundary condition for the partially saturated upper zone. It is shown that after the onset of rainfall, well-defined fronts of water can descend through the soil layer. Also the rainwater flow is relatively quick compared with the moisture uptake by the roots of the plants in the roof. In a separate model the exchanges of water are described between the (smaller-scale) porous granules of soil, the roots and the rainwater in the inter-granule pores.
date: 2009
citation:   Hewitt, I. and Lacey, A.A. and Mellgren, N. and Vynnycky, M. and Robinson, M. and Cooker, M.  (2009) Designing a Green Roof for Ireland.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/391/1/ESGI70_3.pdf