Browsing NIVA-rapporter by Subject "water"
Now showing items 21-40 of 290
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Bløtbunnsfauna i Frierfjorden etter fem år med stagnant dypvann. Undersøkelser våren 2001
(NIVA-rapport;4522, Research report, 2002)I Frierfjordens dypvann er det registrert lange perioder med oksygenmangel. Det er observert at bunnområdene dypere enn 50-60 m er råtne og uten dyreliv. enn 50-60 m er råtne og uten dyreliv. I mars 2001 ble det gjort ... -
Bruk av silikat som alternativ til kalking - feltforsøk med flytende og fast silikat i 1997
(NIVA-rapport;3896, Research report, 1998)Feltforsøk med dosering av flytende silikat-lut som et alternativ til kalking har tidligere vært utprøvd i Tangedalselva. Med tanke på videre bruk av silikat i naturen var det viktig å få undersøkt hvorvidt dosering av ... -
Brukerbeskrivelse og dokumentasjon av programmet RINGSTAT. Utarbeidet for Ringtestsamarbeid for kjemiske vannanalyser. Kontroll av industriutslipp
(NIVA-rapport;1061, Research report, 1978)RINGSTAT er ett av tre datamaskinprogrammer som benyttes i forbindelse med ringtestsamarbeidet for kjemiske vannanalyser. RINGSTAT behandler de enkeltvise ringtestene og regner statistikk og plotter analyseverdiene i ... -
Bunnfauna i terskelfjorder i Aust-Agder. Undersøkelser etter vannutskiftningene vinteren 1989
(NIVA-rapport;2686, Research report, 1992)I en rekke fjorder på Sørlandet ble råttent dypvann løftet til få meters dyp vinteren 1989 og forårsaket dødelighet av fisk og bunndyr. Prøvetaking av bløtbunnsfauna ble foretatt i Gjevingpollen ved Risør, Høydal i ... -
Bærum vannverk. Befaringsundersøkelse med tanke på å avdekke årsak til lukt- og smaksproblemer
(NIVA-rapport;2648, Research report, 1991)Det er foretatt en befaringsundersøkelse ved Bærum Vannverks anlegg ved Aurevatn, samt innsjøer og elver i nedbørfelt for om mulig å avdekke årsak til lukt- og smaksproblemer som oppsto i juli-august 1990. Ingen klare ... -
Børselvprosjektet. Rapport nr. 2 : Fiskeribiologiske undersøkelser i Børselvvassdraget 1998
(NIVA-rapport;4090, Research report, 1999)I 1998 ble det foretatt prøvefiske i Børselvvassdraget med garn i Djupvika (Børselva), Grunnvann og Åsvann, samt elektrofiske i Børselva, Åselva og noen gytebekker i området. Garnfisket ga gode fangster av ørret i Grunnvann ... -
Børselvprosjektet. Rapport nr. 3: Fiskeribiologiske undersøkelser i Børselvvassdraget. 1999
(NIVA-rapport;4323, Research report, 2000)Det ble i 1999 foretatt et prøvefiske i Børselvvassdraget. Innsjøene Djupvann og Åsvann ble undersøkt med garn mens Børselva, Åselva, Storelva og noen gytebekker til grunnvann ble undersøkt vha elektrofiske. Arbeidet i ... -
Changes in the chemistry of Lake Hovvatn, Norway, following liming and reacidification
(NIVA-rapport;1657, Research report, 1984)Hovvatn, a 1 km², chronically-acidified lake in southernmost Norway, was treated with 200 metric tons of powdered limestone in March 1981. An additional 40 metric tons were spread uniformly on the ice of a 0.045 km² pond ... -
Climex project: Data report for June 1994 - May 1999
(NIVA-rapport;4157, Research report, 1999)CLIMEX project was conducted from May 1994 to June 1998 and involved whole ecosystem manipulation of temperature and CO2 at the catchment scale. Measurements of precipitation and runoff continued for one-year post-treatment ... -
CLIMEX project: Response of runoff chemistry after 2 years of elevated CO2 and temperature
(NIVA-rapport;3542, Research report, 1996)CLIMEX is an integrated, whole-ecosystem research project studying the response of entire forested catchments to increased CO2 and temperature. KIM catchment receives clean rain, elevated CO2 and elevated air temperature. ... -
Common Procedure for Identification of the Eutrophication Status of Maritime Area of the Oslo and Paris Conventions. Report on the Comprehensive Procedure for the Norwegian Skagerrak Coast
(NIVA-rapport;4654, Research report, 2003)The Comprehensive Procedure has been applied to the inshore waters of the Norwegian Skagerrak coast, which has been divided into 44 areas. A total of 17 areas are classified as Problem Areas and 27 areas as Potential Problem ... -
Common Procedure for Identification of the Eutrophication status of Maritime Area of the Oslo and Paris Conventions. Report on the Screening Procedure for the Norwegian Coast from Lindesnes to Stad
(NIVA-rapport;4653, Research report, 2003)The Norwegian coast from Lindesnes to Stad has been subjected to the Screening Procedure. Out of a total of 106 areas, 46 areas are classified as Non Problem Areas (NPA). The other subareas should be subjected to the ... -
Critical loads and their exceedances for ICP-Waters sites (ICP Waters report 44/1998)
(NIVA-rapport;3821, Research report, 1998-03)The International Co-operative Programme on Assessment and Monitoring of Acidification of Rivers and Lakes (ICP Waters) is designed to assess, on a regional basis, the degree and geographical extent of acidification of ... -
Critical loads for soil in Norway, Nordmoen
(NIVA-rapport;2605, Research report, 1991)We evaluate the critical load for soil and water at Nordmoen using the dynamic model Magic, the static PROFILE model, and the empirical method as suggested by the mapping handbook. Nordmoen is located about 60 km N of Oslo ... -
Critical loads for soils in Norway. Analyses of soils data from eight Norwegian catchments
(NIVA-rapport;2484, Research report, 1990)Assessment of critical loads for soil at the catchment scale requires estimates of soil properties characteristic of the catchment. Soil data collected in routine soil surveys must thus be aggregated both spatially and ... -
Critical loads for soils in Norway. Preliminary assessment based on data from 9 calibrated catchments
(NIVA-rapport;2483, Research report, 1990)Critical load for acid deposition with respect to soils are calculated for 9 calibrated catchments in southern Norway. Two methods recommended by the UN-ECE Handbook on Mapping Critical Loads were used: The stratic empirical ... -
Critical loads of a acidity to surface waters - Svalbard
(NIVA-rapport;2941, Research report, 1993)Water samples from 162 sites from Svalbard and Bjørnøya were analysed. A precipitation map for Svalbard was prepared. Coloured maps of critical loads and exceedance of critical loads were made for inputs of strong acids. ... -
Critical loads of acidity to lakes in the Polish Tatra Mountains. A study of the yearly variations in the precipitation and water chemistry
(NIVA-rapport;2981, Research report, 1994)As part of the Agreement on Environmental Cooperation between Norway and Poland critical loads of acidity and their exceedance to two lakes in the Polish Tatra Mountains have been calculated after an extensive programme ... -
Critical loads of acidity to surface waters: A case study from the Polish Tatra Mountains
(NIVA-rapport;2725, Research report, 1992)As part of the Agreement on Environmental Cooperation between Norway and Poland critical loads of acidity and their exceedance to lakes in the granitic area of the Polish Tatra Mountains have been estimated. Lake samples ... -
Dalsbekken, Finstadbekken og Ellingsrudbekken i Ski 1989-92
(NIVA-rapport;2975, Research report, 1993)De tre undersøkte bekkene består stort sett av lukkede overvannsledninger i boligområder i Ski kommune. Alle tre bekkene var sterkt forurenset av avløpsvann i hele undersøkelsesperioden. Dette skyldes overløp og lekkasjer ...