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Innovation & Research

Issue No. 69


Super-insulated buildings Construction Futures

Thermal crack control in concrete Fibre-reinforced concrete


Impacts of offshore dredging Environment

Building roads into the landscape Impacts of offshore dredging

Highways Building roads into the landscape 2

Information Award for Highways Agency 5 IT

Information Award for Highways Agency 5 Materials

Thermal crack control in concrete Fibre-reinforced concrete Super-insulated buildings

Structures Impacts of Part L Research & Innovation

Women ‘CORE’ to construction research 3 Construction research project showcase 2 Promoting innovation in the built environment

Water & Sanitation

Water in low-income countries Wind engineering

Wind turbine aerodynamics 6 3 4 5

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Women ‘CORE’ to construction research 3 Design

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Trend analysis for beach & sea-bed management

Improving our understanding of beach and near-shore sea-bed evolution often involves the collection of very large amounts of data. This inevitably covers large areas, and necessitates frequent and repeated surveys. Responding to the need to present this information in a form that is quickly understandable and can readily inform decision making about possible interventions, TRENDAMaT (Trend Analysis and Management Tool) is GIS-based Trend Analysis software recently developed by HR Wallingford.


IS is commonly used by coastal man- agers to manage, display and analyse coastal, estuarine and riverine data. It is an ideal tool to deal with the spatial vari- ability of the data. However, most landforms within these environments also experience temporal variation, and this makes time trend analysis an important requisite if coastal land- form evolution is to be understood. However, GIS techniques have not tradition- ally been able to calculate the change in values over time and, instead, a simple but perhaps misleading technique has been used (where a Digital Terrain Model (DTM) created for a given survey is subtracted from an earlier one). The net result of this calculation is purely the differ- ence in levels between two "snapshots" of bathymetries or beaches in time. It gives no indication of the variation of the levels between these two snapshots, and yet is often misinter- preted to illustrate the time trend of the data. One way to avoid this problem is to extract the levels for each DTM at each individual cell, plot them in a graph and perform a lin- ear regression analysis on them. Clearly this is very time-consum- ing, particularly since many DTMs consist of over 10,000 data cells, and this method does not indicate the spatial distribution of the time trends.

The new trend tool combines time trend analysis with the GIS spatial distribution and shows the changes in bed-level (or any other

parameter) both spatially and temporally. This provides new information on coastal landform evolution, as shown in the figure below. The TRENDAMaT tool uses colours to map the trends it has calculated for tens of thou- sands of individual data points across the area of interest. Whilst this indicates the areas of high variability, the tool actually calculates the rate at which the levels are changing. Designed for use by for coastal practitioners, it provides a time-saving, analytical means of processing datasets of ever increasing size.

For further information, please contact: Jonathan Kemp, HR Wallingford (01491 822412, fax 01491 832233; E-mail

Trend analysis for a Newhaven shingle beach May 2007 Innovation & Research Focus Issue 69 MAY 2007


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