. Developing an integrated hydrograph separation and lumped modelling approach to quantifying hydrological pathways in Irish river catchments. Journal of Hydrology, 486, 259-270. DOI: 10.1016/j.jhydrol.2013 Published in: Journal of Hydrology Document Version: Peer reviewed version Queen's University Belfast -Research Portal: Link to publication record in Queen's University Belfast Research PortalPublisher rights This is the author's version of a work that was accepted for publication in Journal of Hydrology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hydrology, [VOL 486, (2013)] General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. An appreciation of the quantity of streamflow derived from the main hydrological pathways 10 involved in transporting diffuse contaminants is critical when addressing a wide range of 11 water resource management issues. In order to assess hydrological pathway contributions to 12 streams, it is necessary to provide feasible upper and lower bounds for flows in each pathway. 13An important first step in this process is to provide reliable estimates of the slower responding
Quantifying the proportion of the river hydrograph derived from the different hydrological pathways is essential for understanding the behaviour of a catchment. This paper describes a new approach using the output from master recession curve analysis to inform a new algorithm based on the Lyne and Hollick ‘one‐parameter’ signal analysis filtering algorithm. This approach was applied to six catchments (including two subcatchments of these) in Ireland. The conceptual model for each catchment consists of four main flow pathways: overland flow, interflow, shallow groundwater and deep groundwater. The results were compared with those of the master recession curve analysis, a recharge coefficient approach developed in Ireland and the semi‐distributed, lumped and deterministic hydrological model Nedbør‐Afstrømings‐Model. The new algorithm removes the ‘free variable’ aspect that is typically associated with filtering algorithms and provides a means of estimating the contribution of each pathway that is consistent with the results of hydrograph separation in catchments that are dominated by quick response pathways. These types of catchments are underlain by poorly productive aquifers that are not capable of providing large baseflows in the river. Such aquifers underlie over 73% of Ireland, ensuring that this new algorithm is applicable in the majority of catchments in Ireland and potentially in those catchments internationally that are strongly influenced by the quick‐responding hydrological pathways. Copyright © 2013 John Wiley & Sons, Ltd.
Despite considerable investment in recent years, approximately half of all Irish water bodies still do not meet Water Framework Directive (WFD; European Parliament and Council, 2000) objectives.Identifying appropriate measures to address eutrophication linked to agriculture remains a major challenge. Field and modelling studies were integrated in two hydro(geo)logically contrasting Irish catchments at less than Good status, to identify the main pathways delivering flow and nutrients to streams. The transport of phosphorus (P) via overland flow and interflow, and from small point sources, proved the key issues in the catchment underlain by poorly draining soils. Measures in such catchments need to focus on intercepting pathways and mitigating the discharges. In the freely draining karstified catchment, transport of nitrogen (N) and P via subsurface pathways were the key issues. Measures for N in these scenarios need to focus on best management practices of source loads, as interrupting the pathway is much more challenging, whereas measures for P must target managing inputs to groundwater, for example via sinking streams from poorly draining areas. Achieving successful WFD outcomes depends on having a site-specific, three-dimensional understanding of contaminant transfer pathways.
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