Briefing: Wrapt – software for analysing UKCP09 weather generator output

Tomlinson, James; McSweeney, Robert T.; Darch, Geoff; Kilsby, C. G.

doi:10.1680/wama.13.00044

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…The WG incorporates a stochastic rainfall model, which simulates future rainfall sequences, and then generates other weather variables according first to the rainfall state and then to other intervariable relationships, which are represented as regression relationships. The WG has been well validated against observed data from 1961 to 1990 …”

Section: Modeling Frameworkmentioning

confidence: 88%

A Probabilistic Analysis of Surface Water Flood Risk in London

et al. 2017

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Flooding in urban areas during heavy rainfall, often characterized by short duration and high-intensity events, is known as "surface water flooding." Analyzing surface water flood risk is complex as it requires understanding of biophysical and human factors, such as the localized scale and nature of heavy precipitation events, characteristics of the urban area affected (including detailed topography and drainage networks), and the spatial distribution of economic and social vulnerability. Climate change is recognized as having the potential to enhance the intensity and frequency of heavy rainfall events. This study develops a methodology to link high spatial resolution probabilistic projections of hourly precipitation with detailed surface water flood depth maps and characterization of urban vulnerability to estimate surface water flood risk. It incorporates probabilistic information on the range of uncertainties in future precipitation in a changing climate. The method is applied to a case study of Greater London and highlights that both the frequency and spatial extent of surface water flood events are set to increase under future climate change. The expected annual damage from surface water flooding is estimated to be to be £171 million, £343 million, and £390 million/year under the baseline, 2030 high, and 2050 high climate change scenarios, respectively.

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Section: Modeling Frameworkmentioning

confidence: 88%

A Probabilistic Analysis of Surface Water Flood Risk in London

et al. 2017

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“…The methods were implemented using the software tool Wrapt (WG rainfall analysis processing tool), which is described elsewhere Tomlinson et al, 2013). …”

Section: Methodsmentioning

confidence: 99%

Analysing changes in short-duration extreme rainfall events

Darch¹,

McSweeney²,

Kilsby³

et al. 2016

Proceedings of the Institution of Civil Engineers - Water Manag

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Two approaches are presented for using the UKCP09 weather generator (WG) to assess changes in extreme short-duration rainfall. The first provides change factors for design storms of varying duration and frequency, building on established hydrological techniques and with uncertainty estimation. The second approach characterises and facilitates the selection of WG timeseries for use in impact models. The methods have been tested at ten case study sites around the UK. The results show an increase in the intensity of short-duration (1 h and 12 h) events in winter but a reduction in summer, although the latter is subject to high levels of uncertainty. The number of intense events increases slightly and more significantly for some locations, especially in winter. Generally, it is hard to establish any conclusions geographically, although increases in rainfall intensity and events in the Lake District site stand out. The methods provide practical techniques for utilising the UKCP09 WG to assess the impacts of climate change, in particular for urban drainage and sewer modelling

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“…The two briefing papers in this issue cover gradually varied flow in circular channels (Vatankhah and Easa, 2014) and the weather generator rainfall analysis processing tool Wrapt (Tomlinson et al, 2014). The two briefing papers in this issue cover gradually varied flow in circular channels (Vatankhah and Easa, 2014) and the weather generator rainfall analysis processing tool Wrapt (Tomlinson et al, 2014).…”

mentioning

confidence: 99%

“…In the second briefing paper, Tomlinson et al (2014) describe the software tool Wrapt (weather generator rainfall analysis processing tool), created as part of a UK Water Industry Research project to provide guidance on incorporating the impacts of climate change in sewer network modelling. The tool provides the industry with a means of using outputs of climate change projections for the UK (UKCP09) without the requirement for extensive knowledge of climate modelling.…”

mentioning

confidence: 99%

Editorial

Cuthbertson¹

2014

Proceedings of the Institution of Civil Engineers - Water Manag

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It is my pleasure to welcome you to the June issue of Water Management, which brings together a selection of papers, briefings and discussions on a diverse range of interesting topics. The two briefing papers in this issue cover gradually varied flow in circular channels (Vatankhah and Easa, 2014) and the weather generator rainfall analysis processing tool Wrapt (Tomlinson et al., 2014). The subsequent four papers focus on complex flow dynamics generated in stilling basins by submerged jets (Zhang et al., 2014) and at reservoir intakes by free surface vortices (Sarkardeh et al., 2014); sanitation issues associated with portable sewage systems (Khan et al., 2014b); and water quality modelling in clean water distribution networks (Seyoum and Tanyimboh, 2014).The accurate determination of water surface profiles for gradually varied flow (GVF) is a classic hydraulic problem of significant importance to water engineers interested in determining the upstream and downstream influence of in-stream structures or works. In their briefing paper, Vatankhah and Easa (2014) present an exact analytical solution to the simplified GVF equation for circular open channels. Their proposed method is applied to a simple numerical example to demonstrate its improved accuracy in predicting the overall length of affected backwater water surface profiles compared to existing approximate analytical and numerical methods, which underestimate this length by more than 20%. The authors state that their exact GVF solution eliminates the need for these more approximate methods and should provide a useful and simple tool for water engineering practitioners and researchers.In the second briefing paper, Tomlinson et al. (2014) describe the software tool Wrapt (weather generator rainfall analysis processing tool), created as part of a UK Water Industry Research project to provide guidance on incorporating the impacts of climate change in sewer network modelling. The tool provides the industry with a means of using outputs of climate change projections for the UK (UKCP09) without the requirement for extensive knowledge of climate modelling. The authors discuss how Wrapt can be used to assess changes in extremes of shortduration rainfall events, in relation to sewer network performance and design, as well as its potential application to water quality modelling applications.The paper by Zhang et al. (2014) presents a three-dimensional numerical modelling study of the complex flow fields generated by multi-horizontal submerged jets discharging into a stilling basin. This has been proposed as a new type of energy dissipater for hydropower stations with high water heads and large unit discharges. Numerical results are presented for the three typical operating conditions comprising of crest overflow discharges only, mid-orifice discharges only and combined crest overflow and mid-orifice discharges. Results indicate that stable vortices with horizontal axes are generated for the discharges through either the crest or mid-level orifices, while vertical axes ...

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Briefing: Wrapt – software for analysing UKCP09 weather generator output

Cited by 3 publications

References 1 publication

A Probabilistic Analysis of Surface Water Flood Risk in London

A Probabilistic Analysis of Surface Water Flood Risk in London

Analysing changes in short-duration extreme rainfall events

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