Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2018
Forfattere
Kjersti Bakkebø FjellstadSammendrag
Det er ikke registrert sammendrag
Forfattere
Kjersti Bakkebø FjellstadSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Jarle Tommy Bjerkholt Jens Kværner Petter D. Jenssen Tormod BriseidSammendrag
The awareness of sediment and nutrient loss from non-point sources are of increasing environmental concern as measures to reduce point source inputs to surface waters have been introduced. Mitigation efforts to reduce loss of particles and nutrients from agriculture in Norway and other countries have mainly focused on surface runoff, whereas sub-surface drainage has received little attention. However, research has shown that the sub-surface field drains are transporting both sediment and nutrients rapidly to the watercourses. Despite these established facts there has been little development of measures to reduce these losses. This article describes how Lightweight Aggregates (LWA), Leca®, can mitigate some of the environmental challenges connected to sub-surface field drains. A field experimental project was performed to assess the effects on drainage water quality hydrological performance and functionality of drainage systems based on Lightweight Aggregates compared to traditional pipe drains. Registrations of the performance of the systems were done in two separate periods, 1992–1993 and 1999–2000. After 2000 no measurement programme has run. The functionality of the drainage systems was registered in connection to ordinary farming activity. In 1999–2000 LWA drains showed particularly good performance with regard to reducing the content of Phosphorus, 40–90 % reduction in Total-P. The drainage water from the LWA drains contained less than half the amount of suspended solids compared to traditional pipe drains. The results from 1993 showed no significant difference between LWA drains and pipe drains with respect to Nitrogen. The results from 1999/2000 showed higher loss of Nitrogen through pipe drains with no envelope compared to all other systems. LWA drains may be particularly useful in reducing particles and nutrient loads from cultivated flat drained areas adjacent to environmentally sensitive and ecologically important water ecosystems. Further investigations are recommended to optimise the design of LWA drains.