Posts by author: DaveMilledge
Dave Milledge (1,2), Stuart Lane (1,2), Louise Heathwaite (3), Sim Reaney (1,2) The hydrological and biogeochemical processes that operate in catchments influence the ecological quality of freshwater systems through delivery of fine sediment, solutes and organic matter. Most models that seek to characterise the delivery of diffuse pollutants from land to water are reductionist. The [...]
Dave Milledge (1,2), Stuart Lane (1,2), Sim Reaney (1,2), and Louise Heathwaite (3) The concept of connectivity is increasingly being applied in hydrology as researchers attempt to move beyond the traditional partial or variable source area models for runoff generation and consequent material transport to recognize that the flux of water and the materials it [...]
H51D-0936 Poster Inverse modelling of diffuse pollution risks in agricultural catchments Milledge, D, Lane, S N, Heathwaite, L and Reaney, S Watershed scale processes can influence instream aquatic ecosystems, through delivery of fine sediment, solutes and organic matter. Certain areas in a watershed are critical sources, where the ability both to entrain material and to [...]
Questioner: How can I get hold of the rainfall grid that you refer to in the SCIMAP manual? Help: The data is freely available from the Met Office it is UKCP09 data but you can’t transfer the data from person to person, you have to apply for it. You can either: 1) register to use [...]
Questioner: What landcover data do we need to run SCIMAP? Where can we get it from and how much does it cost Help: The CEH LCM 2000 data is more detailed you can buy it from CEH, details below: http://www.ceh.ac.uk/sci_programmes/BioGeoChem/LandCoverMap2000.html
Question: I don’t know how to make sense of the SCIMAP outputs, how can I relate the dots on the map to real locations in my catchment? Answer: We use OS Strategi data to give some spatial context so that you can orientate yourself in your catchment. This data has recently become publicly available through [...]
Questioner: Have you got any info on the landcover map and the weightings given to each landcover type and how these have been calculated? Help: For the land cover data we tend to use the CEH LCM2000 but an alternative would be the CORINE data. In both cases we reclassify the data into the following [...]
Questioner: I have used spatial analyst to cut the DEM, landcover map and annual average rainfall layers and save all of these as ascii files. They all load into SAGA and you can do all the operations you like on them individually but they are slightly different grid systems and different spatial units so I [...]
Question: What are the required specifications for a computer to run SCIMAP (speed / memory etc)? Answer: I would definitely go for a desktop rather than a laptop but aside from that it doesn’t need to be too powerful really. The computer that I use at the moment is: a Dell Precision PWS390 with an [...]
There have been a number of training courses on SCIMAP that have been given to the Environment Agency and the Associsation of River Trusts. These course have taken two approachs, one focused on using ArcGIS in combination with SAGA-GIS and the other focused on just using the open source SAGA-GIS. You can download the course [...]
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