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DrainMod - NII

Fig4_1

Kilde: Moursi et al, 2022

Forskningsmodellen - DRAINMOD

 

DRAINMOD er en databasert simuleringsmodell utviklet av Dr. Wayne Skaggs ved Institutt for Biologisk og Landbruksteknikk, North Carolina State University, Raleigh, NC i 1980. Modellen simulerer hydrologien i dårlig drenerte jordarter med høy grunnvannstand, time for time og dag for dag, over lange klimatiske tidsserier (f.eks. 50 år). Modellen forutsier effektene av drenering og tilhørende vannforvaltningstiltak på grunnvannsnivåer, jordens vannregime og avlinger.

 

Grunnleggende spesifikasjoner for modellen:

Navn på modellen

DrainMod-NII

Om modellen

 

Formål med modellen

Dreneringssystemdesign

Utviklet av

North Carolina State University, USA, 1980

https://www.bae.ncsu.edu/agricultural-water-management/drainmod/

Skala

 

Romlig

1D/semi 2D profil

Tidsmessig

Daglig (eller timebasert)

Prosessbeskrivelse

 

Modelltype

Prosessbasert

Varme

Ja

Intersepsjon

Nei

Snødynamikk

Ja, basert på temperatur

Infiltrasjon og vannstrøm

Ja, Green-Ampt infiltrasjon

Frossen jord

Ja, både varme og vann påvirkes

Overflateavrenning

Ja, både Hortonisk og metningsoverskudd

Plantevekst

Nei, men relative avlinger kan beregnes. Kan kobles til andre modeller (DRAINMOD-DSSAT, DRAINMOD-GRASS)

Makroporestrøm

Nei

Nitrogentransport

Ja, til luft og vann

Evapotranspirasjon

Ja

Fosfortransport

Nei

Kunstig drenering

Ja

Partikkeltransport

Nei

Perkolasjon

Ja

Plantevernmiddelransport

Nei

Andre

-

 

Publikasjoner

Sammendrag

The Skuterud catchment is a small artificially drained agricultural catchment, located in south eastern Norway. The total area of the catchment is 4.5 km2 of which agriculture covers 2.7 km2, forest 1.3 km2 while the rest is occupied by urban area. The main agricultural crops are wheat, barley and oat. The climate is cold temperate continental or subarctic with a winter season, lasting from November -March and characterized by periods with below-zero temperatures and a varying degree of snow cover, interchanged with thaw periods combined with precipitation and runoff. In Norway, melt water, causing surface runoff, is one of the most serious reasons for erosion, in addition to near-saturated soil moisture conditions after longer periods with rainfall during the autumn. Climate change can potentially lead to an increase in the number of freeze/thaw cycles which in addition to the predicted increase in precipitation during the period after the growing season from September - April, might lead to an increase in both the amount of runoff and its intensity, with subsequent adverse effects on erosion and nutrient loss. Models are indispensable tools in the prediction of climate change effects on runoff generation. In this respect, the Drainmod model has been tested on the Skuterud catchment concerning its ability to predict runoff from an artificially drained agricultural catchment under prevailing winter conditions. The results are presented in this paper. If proven successful, the model can be used to predict the long term hydrologic impacts of climate change for the Norwegian conditions