A. A. Mckenzie

A. A. Mckenzie
British Geological Survey · Groundwater Science

About

23
Publications
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580
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Introduction

Publications

Publications (23)
Article
Full-text available
The majority of India’s rural drinking water supply is sourced from groundwater, which also plays a critical role in irrigated agriculture, supporting the livelihoods of millions of users. However, recent high abstractions are threatening the sustainable use of groundwater, and action is needed to ensure continued supply. Increased managed aquifer...
Article
Groundwater resources in the crystalline basement complex of India are crucial for supplying drinking water in both rural and urban settings. Groundwater depletion is recognised as a challenge across parts of India due to over-abstraction, but groundwater quality constraints are perhaps even more widespread and often overlooked at the local scale....
Conference Paper
Full-text available
Deltaic coastal areas face challenges in dry season water availability, with brackish rivers and limited reservoir constructing opportunities. Water supplies and irrigation may depend on groundwater. In aquifers where confined saline layers are present aquifer storage and recovery can be developed to provide extra water resources during drought. Th...
Article
Full-text available
During drought, groundwater is often relied on to provide secure drinking water, particularly in rural Africa where other options are limited. However, the technology chosen to access groundwater significantly affects local water security. Here we examine the performance of springs, hand-dug- wells and boreholes in northern Ethiopia through direct...
Preprint
Title (10/10 words)Feasibility of water storage in saline aquifers for drought resilience Highlights (48/50 words): Deltaic coastal areas face challenges in dry season water availability, with brackish rivers and limited reservoir constructing opportunities. Water supplies and irrigation may depend on groundwater. In aquifers where confined saline...
Article
Full-text available
Here we present the first empirical evidence for changes in groundwater drought associated with anthropogenic warming in the absence of long-term changes in precipitation. Analysing standardised indices of monthly groundwater levels, precipitation and temperature, using two unique groundwater level data sets from the Chalk aquifer, UK, for the peri...
Article
Full-text available
Here we present the first empirical evidence for changes in groundwater droughts associated with anthropogenic warming in the absence of significant long-term trends in precipitation. Analysing standardised indices of monthly groundwater levels, precipitation and temperature, using two unique groundwater level data sets from the Chalk aquifer, UK f...
Article
Full-text available
During prolonged droughts, information is needed about when and how the extreme event is likely to terminate. A drought termination framework based on historical data comprising current rate and historical ensemble approaches is presented here for assessing the prospects of groundwater level recovery. The current rate approach is evaluated across a...
Article
Full-text available
This paper describes the development of the first operational seasonal hydrological forecasting service for the UK, the Hydrological Outlook UK (HOUK). Since June 2013, this service has delivered monthly forecasts of streamflow and groundwater levels, with an emphasis on forecasting hydrological conditions over the next three months, accompanied by...
Article
Controls on the spatiotemporal extent of groundwater flooding are poorly understood, despite the long duration of groundwater flood events and distinct social and economic impacts. We developed a novel approach using statistical analysis of groundwater level hydrographs and impulse response functions (IRFs) and applied it to the 2013/14 Chalk groun...
Conference Paper
Land-use change and related changes in water use are key drivers of changes in the regional water cycle. This is especially the case for large-scale changes from bare and forested land into irrigated agriculture. Over the last decades, the Gangetic plains in northern India have undergone the world's largest and fasted increase in irrigated agricult...
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
In the UK national derived geological datasets are increasingly being produced, many of which are based on NEXTMap digital terrain model (DTM) or digital surface model (DSM) data. These include groundwater level and land stability datasets. Any DTM is a model of the land surface and under different conditions may have differing degrees of accuracy....
Article
Groundwater flooding, which occurs when the groundwater table rises in response to exceptional recharge rates either to the ground surface or to a point where subsurface infrastructure is affected, has been recognized as a significant issue with real economic impacts. A methodology has been developed to produce maps of groundwater flooding suscepti...
Article
A dataset of well and spring locations in NW Anglesey with accompanying geological observations was recently discovered at the British Geological Survey. The data are likely to have been recorded as part of an environmental survey in the late 1960s or early 1970s. The area comprises Palaeozoic and Precambrian rocks partly covered by moderately perm...
Article
A novel approach is taken to the problem of estimating global water scarcity, using a realistic and consistent procedure applied across many countries. Water demands, surface flows and groundwater availability are estimated on a gridded basis, and various water availability indices are derived comparing the resource with the projected demand. Surfa...
Article
An information system for the management of groundwater data was developed for the government of Honduras. The database design concentrated on close attention to the requirements and skills of the users. The database was implemented using commercially available database languages and programming tools. This allowed a bilingual system closely matche...
Article
Full-text available
The data analysed in this report were primarily collated by the National Hydrological Monitoring Programme operated jointly by the Centre for Ecology & Hydrology and the British Geological Survey. The Programme was set up in !988 and relies on the active co-operation of the Environment Agency, Scottish Environment Protection Agency, Rivers Agency (...
Article
Full-text available
An understanding of non-causal relationships between processes in the air, soil and water compartments of the environment is fundamental to sustainable integrated management. This paper provides an overview of the groundwater sub-compartment and asserts that it exhibits many characteristics of a complex system, especially in relation to a wide rang...

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