Showing papers by "Mott MacDonald published in 1992"
TL;DR: In this article, the authors present a qualitative appraisal of three methods, based on the use of portable pumps and packers, frequently combined with flow logging, in four open boreholes penetrating a multi-layered aquifer.
Abstract: An important aspect of any detailed groundwater quality investigation is determining the vertical distribution of pollutants. This may best be achieved by using permanent sampling systems installed in dedicated boreholes. However, the availability of open boreholes in the UK, coupled with the relative expense of installing dedicated systems, has increased the value of methods for obtaining level-determined samples from such boreholes. This paper presents a qualitative appraisal of three such methods, based on the use of portable pumps and packers, frequently combined with flow logging. The methods were tested in four open boreholes penetrating a multi-layered aquifer. In the most successful applications, vertical profiles of chlorinated hydrocarbon solvent concentrations were defined which were thought to be representative of those in the aquifer.
13 citations
TL;DR: In this paper, the authors outline the engineering of the river diversion, which is routed for about 2 km through varied and difficult ground conditions, and give a number of examples of the priority attached to landscape and after-use factors, and their intrinsic importance in design.
Abstract: The Welbeck reclamation and landfill project (near Wakefield) is reclaiming over 1.5 km2 of former aggregate and colliery workings through the creation of a new landform. This is to incorporate millions of tonnes of colliery spoil and controlled (i.e. household, trade) wastes, and to avoid the need for disposal on less suitable sites elsewhere.
The scheme is already under way, but the proposed diversion of the River Calder to one side of the site would more than double its capacity for landfill. In environmental terms, the project has been seen as the creation of a new river corridor, rather than simply the diversion of a river channel.
The paper outlines the engineering of the river diversion, which is routed for about 2 km through varied and difficult ground conditions, and gives a number of examples of the priority attached to landscape and after-use factors, and their intrinsic importance in design.
1 citations
TL;DR: The results from the water sampling programme have been used to build a 3D computer model with a supporting graphic information system to attain qualitative evaluations of management and development options, and short-term predictions of changes in water quality.
Abstract: Regeneration and changes in land use in London's Docklands have resulted in new water quality requirements. Areas previously occupied by docks now form part of redevelopment projects which have made a feature of the water.
The paper describes a project to provide water that is aesthetically pleasing and of a quality suitable for water contact recreational activities.
An extensive programme of water sampling and analysis was carried out to gain an understanding of the processes affecting water quality, including the monitoring of algal growth. The river is the main source of nutrients in the docks, which results in large concentrations of algal biomass and bacterial contamination. The principal strategy is to limit light via artificial mixing systems supplemented by limiting the inflow of nutrients from the river.
The results from the water sampling programme have been used to build a 3D computer model with a supporting graphic information system to attain (a) qualitative evaluations of management and development options, and (b) short-term predictions of changes in water quality.