Publications
444 results found
Lee H, McIntyre N, Wheater H, et al., 2005, Selection of conceptual models for regionalisation of the rainfall-runoff relationship, JOURNAL OF HYDROLOGY, Vol: 312, Pages: 125-147, ISSN: 0022-1694
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- Citations: 60
Mathias SA, Butler AP, McIntyre N, et al., 2005, The significance of flow in the matrix of the Chalk unsaturated zone, JOURNAL OF HYDROLOGY, Vol: 310, Pages: 62-77, ISSN: 0022-1694
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- Citations: 49
Smith RMS, Evans DJ, Wheater HS, 2005, Evaluation of two hybrid metric-conceptual models, for simulating phosphorus transfer from agricultural land in the river enborne, a lowland UK catchment, JOURNAL OF HYDROLOGY, Vol: 304, Pages: 366-380, ISSN: 0022-1694
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- Citations: 13
Yang C, Chandler RE, Isham VS, et al., 2005, Simulation and downscaling models for potential evaporation, JOURNAL OF HYDROLOGY, Vol: 302, Pages: 239-254, ISSN: 0022-1694
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- Citations: 16
Wheater HS, Peach D, 2004, Developing interdisciplinary science for integrated catchment management: The UK LOwland CAtchment Research (LOCAR) Programme, Seminar on Towards Integrated Catchment Management - Increasing the Dialogue between Scientists, Policymakers and Stakeholders held at the Third World Water Forum, Publisher: CARFAX PUBLISHING, Pages: 369-385, ISSN: 0790-0627
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- Citations: 49
Smith RMS, Wheater HS, 2004, Multiple objective evaluation of a simple phosphorus transfer model, HYDROLOGICAL PROCESSES, Vol: 18, Pages: 1703-1720, ISSN: 0885-6087
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- Citations: 12
McIntyre NR, Wheater HS, 2004, Calibration of an in-river phosphorus model: prior evaluation of data needs and model uncertainty, JOURNAL OF HYDROLOGY, Vol: 290, Pages: 100-116, ISSN: 0022-1694
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- Citations: 32
McIntyre N, Jackson B, Wheater H, et al., 2004, Numerical efficiency in Monte Carlo simulations - Case study of a river thermodynamic model, JOURNAL OF ENVIRONMENTAL ENGINEERING, Vol: 130, Pages: 456-464, ISSN: 0733-9372
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- Citations: 1
McIntyre NR, Wheater HS, 2004, A tool for risk-based management of surface water quality, Environmental Modelling & Software, Vol: 19, Pages: 1131-1140, ISSN: 1364-8152
Jackson BM, Wheater HS, McIntyre N, et al., 2004, Calibration and uncertainty issues arising from a process-based integrated nitrogen model (INCA) placed within a subjective probability framework, London, Hydrology: science and practice for the 21st century, July 2004, Publisher: Imperial College London, Pages: 123-129
Howden NJK, Wheater HS, Peach DW, et al., 2004, Hydrogeological controls on surface/groundwater interactions in a lowland permeable chalk catchment, London, Hydrology: science and practice for the 21st century, proceedings of the British Hydrological Society international conference, July 2004, Publisher: Imperial College London, Pages: 113-122
Wagener T, Wheater HS, Gupta HV, 2004, Rainfall-runoff modelling in gauged and ungauged catchments, Imperial College Press, ISBN: 9781860944666
Mathias SA, Butler AP, McIntyre N, et al., 2004, Applicability of box models to dual porosity systems, Hydrology: science and practice for the 21st century, Pages: 315-321
Lee H, McIntyre NR, Wheater HS, et al., 2004, Assessment of rainfall-runoff model structures for regionalisation purposes, Hydrology: science and practice for the 21st century, Pages: 302-308
Mathias SA, Butler AP, McIntyre N, et al., 2004, Applicability of box models to dual porosity systems, Hydrology: science and practice for the 21st century, Pages: 315-321
McIntyre N, Lee H, Wheater HS, et al., 2004, Approaches and tools for evaluating uncertainty in streamflow predictions in ungauged UK catchments, IEMSS Conference, 14 - 17 June 2004, Osnabruck, Germany, Pages: 1171-1176
Hardisty PE, Wheater HS, Birks D, et al., 2003, Characterization of LNAPL in fractured rock, Q J ENG GEOL HYDROGE, Vol: 36, Pages: 343-354, ISSN: 1470-9236
Behaviour of light non-aqueous phase liquids (LNAPLs) within a fractured rock mass is a function of the properties of the immiscible fluid, the fracture network, rock matrix properties, and the groundwater regime. LNAPL behaves differently in rock with open fractures than it does in porous media. Relatively small volumes of LNAPL within vertical or subvertical fractures can produce significant LNAPL pressure heads, resulting in LNAPL penetration into the saturated zone. Penetration can be significantly deeper than predicted by porous medium models. Groundwater surface fluctuations can cause lateral LNAPL migration, even up-gradient to natural gradients. Characterization of LNAPL-contaminated fractured rock masses must take into account these fundamental differences in behaviour. Site investigation should focus on determination of fracture network and rock matrix properties, understanding of groundwater surface fluctuation dynamics, and consideration of spatial LNAPL distribution. A combination of techniques, many not used in porous medium investigations, but can used to develop a detailed conceptual model. These include coring, angled holes, digital borehole imaging, and fracture casting for aperture determination. The data provide information on LNAPL occurrence and behaviour, allow LNAPL spill volume to be estimated, indicate future movement, and ultimately allow for more effective and economic remedial decision making.
Koutsoyiannis D, Onof C, Wheater HS, 2003, Multivariate rainfall disaggregation at a fine timescale, WATER RESOUR RES, Vol: 39, Pages: 1173-1190, ISSN: 0043-1397
[1] A methodology for spatial-temporal disaggregation of rainfall is proposed. The methodology involves the combination of several univariate and multivariate rainfall models operating at different timescales, in a disaggregation framework that can appropriately modify outputs of finer timescale models so as to become consistent with given coarser timescale series. Potential hydrologic applications include enhancement of historical data series and generation of simulated data series. Specifically, the methodology can be applied to derive spatially consistent hourly rainfall series in rain gages where only daily data are available. In addition, in a simulation framework the methodology provides a way to take simulations of multivariate daily rainfall ( incorporating spatial and temporal nonstationarity) and generate multivariate fields at fine temporal resolution. The methodology is tested via a case study dealing with the disaggregation of daily historical data of five rain gages into hourly series. Comparisons show that the methodology results in good preservation of important properties of the hourly rainfall process such as marginal moments, temporal and spatial correlations, and proportions and lengths of dry intervals as well as a good reproduction of the actual hyetographs.
Sincock AM, Wheater HS, Whitehead PG, 2003, Calibration and sensitivity analysis of a river water quality model under unsteady flow conditions, JOURNAL OF HYDROLOGY, Vol: 277, Pages: 214-229, ISSN: 0022-1694
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- Citations: 42
McIntyre NR, Wagener T, Wheater HS, et al., 2003, Risk-based modelling of surface water quality: a case study of the Charles River, Massachusetts, JOURNAL OF HYDROLOGY, Vol: 274, Pages: 225-247, ISSN: 0022-1694
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- Citations: 36
McIntyre N, Lees M, Wheater H, et al., 2003, Evaluation and visualisation of risk to water resources, PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-WATER AND MARITIME ENGINEERING, Vol: 156, Pages: 1-11, ISSN: 1472-4561
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- Citations: 6
Wagener T, McIntyre N, Lees MJ, et al., 2003, Towards reduced uncertainty in conceptual rainfall-runoff modelling: Dynamic identifiability analysis, Workshop on Runoff Generation and Implications for River Basin Modelling, Publisher: WILEY, Pages: 455-476, ISSN: 0885-6087
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- Citations: 409
McIntyre N, Lees M, Wheater H, et al., 2003, Evaulation and visualisation of risk to water resources, Proceedings of the Institution of Civil Engineers: Water and Maritime Engineering, Vol: 156, Pages: 1-11, ISSN: 1472-4561
A traditional difficulty encountered in water resource planning is the inherent uncertainty in demand and supply capability. Over recent years this uncertainty has increased for the UK water industry, owing for example to forecasts of climate change and impending directives from Europe, and in the face of such uncertainty it is no longer justifiable to design water resource systems in a deterministic fashion. Design objectives should be risk-based, and it is likely that both investors and regulators will soon request formal risk evaluation prior to major investment or strategic decisions. Consequently, there is a need for probabilistic, or risk-based, approaches to water resource assessment. A methodology for evaluation and visualisation of risk to security of water resources is presented, based on hydrological frequency of occurrence and uncertainty-based analysis of headroom (that is, the difference between supply capability and demand). The methodology makes it possible to calculate and visualise the probability of system failure for particular hydrological conditions or the probability of system failure in an arbitrary year, and to make preventive planning or operational decisions. The proposed approach is illustrated with a case study.
Yang C, Chandler RE, Isham VS, et al., 2003, Simulation and downscaling models for potential evaporation, London, Publisher: Department of Statistical Science, University College London, 236
Daldorph PWG, Wheater HS, 2003, Impact of EU legislation on a UK catchment (The Wash), BHS Occasional Paper No 14. Managing our aquatic environment in the 21st century: contemporary issues of water quality
Wheater HS, Daldorph PWG, 2003, Decision support modelling for water quality management: a pre-pilot case study for the EU water framework directive, Proceedings of 8th international conference on environmental science and technology, Lemnos Island, Greece, 8 - 10 September, Pages: 965-972
Wagener T, Wheater HS, Gupta HV, 2003, Identification and evaluation of watershed models, Calibration of watershed models, Editors: Duan, Gupta, Turcotte, Sorooshian, Rousseau, Washington, D.C., Publisher: American Geophysical Union, ISBN: 9780875903552
McIntyre NR, Wagener T, Wheater HS, et al., 2003, Uncertainty and risk in water quality modelling and management, Journal of Hydroinformatics, Vol: 5, Pages: 259-274, ISSN: 1464-7141
Maxey RT, Lekkas DF, Wheater HS, 2003, Intercomparison of forecasting methods for flood warning in the River Cam catchment, 8th International Conference on Environmental Science and Technology, Publisher: UNIV AEGEAN, Pages: 582-592, ISSN: 1106-5516
Chandler RE, Wheater HS, 2002, Analysis of rainfall variability using generalized linear models: A case study from the west of Ireland, Water Resources Research, Vol: 38, ISSN: 0043-1397
In the early 1990s a cluster of extreme flood events occurred in the south Galway region of western Ireland, and this led to speculation of changing rainfall patterns in the area. In this paper we illustrate the use of generalized linear models (GLMs) to test for such changes and quantify their structure. GLMs, long established in the statistical literature, provide a flexible and rigorous formal framework within which to distinguish between possible climate change scenarios and are able to deal with high levels of variability, such as those typically associated with daily rainfall sequences. The study indicates that the GLM approach provides a powerful tool for interpreting historical rainfall records.
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