Melinda Anne Lewis

Melinda Anne Lewis
British Geological Survey · Groundwater Science

Geology

About

27
Publications
8,500
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863
Citations
Introduction
Skills and Expertise
Additional affiliations
September 1975 - present
British Geological Survey
Position
  • Senior Hydrogeologist

Publications

Publications (27)
Book
The first formal publication on the geology of Singapore was released in 1976 by the Public Works Department, with an updated version published in 2009 by the Defence Science and Technology Agency (DSTA). This memoir presents a comprehensive revision of the geology of Singapore based largely on information obtained from new borehole cores. Work be...
Article
Full-text available
We present the first large-sample catchment hydrology dataset for Great Britain, CAMELS-GB (Catchment Attributes and MEteorology for Large-sample Studies). CAMELS-GB collates river flows, catchment attributes and catchment boundaries from the UK National River Flow Archive together with a suite of new meteorological time series and catchment attrib...
Preprint
Full-text available
Abstract. We present the first large-sample catchment hydrology dataset for Great Britain, CAMELS-GB (Catchment Attributes and MEteorology for Large-sample Studies). CAMELS-GB collates river flows, catchment attributes and catchment boundaries from the UK National River Flow Archive together with a suite of new meteorological timeseries and catchme...
Article
Full-text available
Study region: The study region is Great Britain (GB), a small non-continental island landmass in North West Europe Study focus: Data for Total Dissolved Solids (TDS) from groundwater samples can be used to characterise regional-scale variations in the quality of deep groundwater systems. Combined with information about typical well-depths, TDS data...
Article
This paper describes a new screening method for assessing groundwater vulnerability to pollution from hydrocarbon exploitation in the subsurface. The method can be used for various hydrocarbon energy sources, including conventional oil and gas, shale gas and oil, coal bed methane and underground coal gasification. Intrinsic vulnerability of potenti...
Article
Full-text available
Mitigating agricultural water pollution requires changes in land management practices and the implementation of on-farm measures to tackle the principal reasons for water quality failure. However, a paucity of robust empirical evidence on the hydrological functioning of river catchments can be a major constraint on the design of effective pollution...
Technical Report
Full-text available
This report is the product of a joint British Geological Survey (BGS) – Environment Agency (EA) study to assess the vulnerability of groundwater in relation to deep sub-surface hydrocarbon activity (3D Groundwater Vulnerability) in England. Available from: http://nora.nerc.ac.uk/id/eprint/520550/1/OR18012.pdf
Article
Full-text available
Shale gas is considered by many to have the potential to provide the UK with greater energy security, economic growth and jobs. However, development of a shale gas industry is highly contentious due to environmental concerns including the risk of groundwater pollution. Evidence suggests that the vertical separation between exploited shale units and...
Article
Full-text available
Global-scale nitrogen budgets developed to quantify anthropogenic impacts on the nitrogen cycle do not explicitly consider nitrate stored in the vadose zone. Here we show that the vadose zone is an important store of nitrate that should be considered in future budgets for effective policymaking. Using estimates of groundwater depth and nitrate leac...
Article
Full-text available
Groundwater ecosystems comprising micro-organisms and metazoans provide an important contribution to global biodiversity. Their complexity depends on geology, which determines the physical habitat available, and the chemical conditions within it. Despite this, methods of classifying groundwater habitats using geological data are not well establishe...
Technical Report
Full-text available
This report details the findings of a project jointly funded by the British Geological Survey (BGS)and Defra through the Environment Agency. The overall aim of the work was to investigate the use of new models to inform decision-making on nitrate pollution in groundwater and the potential for incorporating unsaturated zone processes into the model...
Article
Full-text available
Nitrate is necessary for agricultural productivity, but can cause considerable problems if released into aquatic systems. Agricultural land is the major source of nitrates in UK groundwater. Due to the long time-lag in the groundwater system, it could take decades for leached nitrate from the soil to discharge into freshwaters. However, this nitrat...
Chapter
This chapter examines the growth of the UK's hydrometric monitoring networks and data acquisition capabilities, together with the development of hydrological archives and digital catchment characterisations. It reviews the design of increasingly sophisticated databases and quality assurance mechanisms together with the use of hydrological data both...
Article
The development and validation of aquifer productivity and depth-to-source maps for England and Wales are described. Aquifer productivity maps can provide valuable support for the assessment, planning and management of groundwater and renewable heat energy resources. Aquifer productivity is often mapped using geostatistical interpolation techniques...
Article
Full-text available
This paper outlines the hydrological aspects of the 2013/2014 winter flooding in the UK, as well as the impacts. The episode is considered in a long-term historical context and wider issues raised by the flood events are discussed briefly.
Article
Full-text available
The UK Government expects that, by 2020, 12% of the UK's heat demand will come from renewable sources, and is providing incentives to help achieve this. Open-loop ground source heat pumps (GSHP) could make a substantial contribution. A web-based screening tool has been developed that highlights areas where conditions may be suitable for installing...
Conference Paper
Full-text available
Due to climate change and new political reasons to use more sustainable energy forms (turning away from nuclear, coal and other non-renewable resources), alternative energy sources are needed. Therefore, the geothermal energy sector can become one of the important energy resources in the future. Geothermal energy (heat) is CO 2-neutral, quasi-inexh...
Article
A simple process-based approach to predict regional-scale loading of nitrate at the water table was implemented in a GIS for Great Britain. This links a nitrate input function, unsaturated zone thickness, and lithologically dependent rate of nitrate unsaturated zone travel to estimate arrival time of nitrate at the water table. The nitrate input fu...
Article
The performance of an open- or closed-loop ground source heat pump system depends on local geological conditions. It is important that these are determined as accurately as possible when designing a system, to maximize efficiency and minimize installation costs. Factors that need to be considered are surface temperature, subsurface temperatures dow...
Article
The recently published groundwater vulnerability map of Fife is the first in a series of maps for the Scottish Environment Protection Agency (SEPA), which includes the unpublished maps of the areas around Dumfries and Strathmore. Based on the methodology used on the Environment Agency maps of England and Wales, the lithology and permeability of the...
Article
Groundwater represents around 35% of water distributed for potable supply in England and Wales and is also utilized by industry and for private supplies. It is of high quality and requires little treatment before use. It is important, therefore, that a robust policy of groundwater protection is available to protect the resource from pollution, as r...
Article
There were only slight variations in mean yield from boreholes which finished in the regolith and those penetrating the underlying hard rock (55 l/min and 68 l/min respectively). Relative relief subsets of the total borehole data showed clear associations of low relative relief, thicker total and thicker saturated regolith and higher yields, where...

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