Changes between Version 2 and Version 3 of elbeEDA
- Timestamp:
- Jan 19, 2011 3:10:03 PM (14 years ago)
Legend:
- Unmodified
- Added
- Removed
- Modified
-
TabularUnified elbeEDA
v2 v3 6 6 peer.doering-arjes@ifb-postdam.de 7 7 Within the Elbe system, mostly restocking takes places with a mean value of 0.196 kg/ha for restocking and only 0.029 kg/ha for natural migration. For this reason, building the EDA model on distance to the sea and expected migration, and the effect of barriers on eel repartition does not really make sense. Data are available for restocking. They separate eel into three categories. Glass eel, young yellow eels, and older yellow eels. These data are available per bundeslanders per year. We need to connect them to the riversegments and years. 8 A restocked eel will be estimated to possibly influence the eel density or biomass from say from year 2 to 12 if it is a glass eel, year 0 to 1àif it is a young yellow eel... For each year the sum of recruitment possibly influencing will be calculated. A link between riversegments and counties will be established. When two counties border a riversegment, or when the riversegment is within some distance from a county, the sum of corresponding stocking will be done (this is sum to be made in sql). The density for a given year will thus respond to three different variables corresponding to the different stocking size.8 A restocked eel will be estimated to possibly influence the eel density or biomass from let's say year 2 to 12 if it is a glass eel, year 0 to 10 if it is a young yellow eel... For each year the sum of recruitment possibly influencing will be calculated. A link between riversegments and counties will be established. When two counties border a riversegment, or when the riversegment is within some distance from a county, the sum of corresponding stocking will be done (this is sum to be made in sql). The density for a given year will thus respond to three different variables corresponding to the different stocking size. 9 9 * Task(peer & Erick) 10 10 * Send table prepared for Daniele which contains information on growth... necessary for the computation.
