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Technical Note: Assessing a 24/7 solution for monitoring water quality loads in small river catchments

Jordan, Philip and Cassidy, R. (2011) Technical Note: Assessing a 24/7 solution for monitoring water quality loads in small river catchments. HYDROLOGY AND EARTH SYSTEM SCIENCES, 15 (10). pp. 3093-3100. [Journal article]

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DOI: 10.5194/hess-15-3093-2011


Quantifying nutrient and sediment loads in catchments is difficult owing to diffuse controls related to storm hydrology. Coarse sampling and interpolation methods are prone to very high uncertainties due to under-representation of high discharge, short duration events. Additionally, important low-flow processes such as diurnal signals linked to point source impacts are missed. Here we demonstrate a solution based on a time-integrated approach to sampling with a standard 24 bottle autosampler configured to take a sample every 7 h over a week according to a Plynlimon design. This is evaluated with a number of other sampling strategies using a two-year dataset of sub-hourly discharge and phosphorus concentration data. The 24/7 solution is shown to be among the least uncertain in estimating load ( inter-quartile range: 96% to 110% of actual load in year 1 and 97% to 104% in year 2) due to the increased frequency raising the probability of sampling storm events and point source signals. The 24/7 solution would appear to be most parsimonious in terms of data coverage and certainty, process signal representation, potential laboratory commitment, technology requirements and the ability to be widely deployed in complex catchments.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Freshwater Sciences
ID Code:20871
Deposited By: Professor Phil Jordan
Deposited On:13 Feb 2012 15:50
Last Modified:13 Feb 2012 15:50

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