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Uncertainty estimation of end-member mixing using generalized likelihood uncertainty estimation (GLUE), applied in a lowland catchment
In this paper, we outline a procedure, based on the generalized likelihood uncertainty estimation (GLUE) framework, to more inclusively evaluate uncertainty in mixing models than existing approaches. We apply this procedure, referred to as G-EMMA, to a yearlong chemical data set from the heavily impacted agricultural Lissertocht catchment, Netherlands, and compare its results to the ‘‘traditional’’ end-member mixing analysis (EMMA). The results suggest that the concentration distribution of ‘‘effective’’ end-members, that is, the flux-weighted input of an end-member to the stream, can differ markedly from that inferred from sampling of water stored in the catchment. Results also show that the uncertainty arising from identifying the correct end-members may alter calculated endmember contributions by up to 30%, stressing the importance of including the identification of end-members in the uncertainty assessment.
Strength of sediment mixtures as a function of sand content and clay mineralogy
Golfoverslag en sterkte grasbekleding, fase 3D : evaluatie Afsluitdijk
Modelling the 1775 storm surge deposits at the Heemskerk dunes
After a storm surge hit the Dutch coast at November 9, 2007, old deposits were discovered in the eroded dunes near Heemskerk, the Netherlands. The deposits have been recognized as evidence of one or two historical storm surges. From historical records, it is known that major storm surges occurred in 1775 and 1776 ; most likely one or both of these events are responsible for the deposition of the layers. The aim of this thesis is to model the 1775 storm surge and its capability to reach the maximum height at which the deposits have been discovered. The modelling has been done with the numerical program XBeach, using a probabilistic approach and historical data as input. Secondary objectives are (a) to give an estimation of the probability of exceedance of the 1775 storm surge and (b) to compare the effects of this storm surge on a open dune front (historical situation) and a closed dune front (present situation).
Veldonderzoek betreffende onderlagen van steenzettingen in Zeeland : methodiek en meetgegevens en analyse
Railway transition zones and switches : factual report fieldtest monitoring
Analyse stortvak W13
SBW Piping : HP9. Technisch rapport zandmeevoerende wellen (herziene versie 2011)
SBW wave overtopping and grass cover strength : model development
The strength of grass covers on dikes under wave overtopping conditions is being investigated within the framework of SBW (Strength and Loads on Water defences). In the period 2012-2016 the attention is focused on aspects like erosion around objects, transitions in a grass cover and erosion in the wave run-up zone. This report represents the model development phase in a research cycle, and is followed by a prediction, field testing and evaluation phase.
Mobile services for flood early warning in Bangladesh : business models for exploitation and maintenance of the improved Early Warning System (Task C)