Show simple item record

dc.contributor.authorBerge, D.nb_NO
dc.contributor.authorKnutzen, J.nb_NO
dc.contributor.otherBerge, D. - Project managernb_NO
dc.coverage.spatialVietnamnb_NO
dc.date.accessioned2014-08-01T10:40:38Z
dc.date.available2014-08-01T10:40:38Z
dc.date.issued1997nb_NO
dc.identifier3621nb_NO
dc.identifier.isbn82-577-3177-3nb_NO
dc.identifier.issn1894-7948nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/209277
dc.description.abstractThe three rivers Rao Quan, Khe Nghi, and Quang Tri contain relatively soft water with a calcium content from 3 - 17 mg/l. The pH value varies from 7-9. The alkalinity varies from 0.4-1.4 mMol/l which indicates good buffer capacity against acidification. The sulphate concentration is also low. The water will not be aggressive against concrete material. The turbidity of the water varies from 1,8 FTU in the dry season to 16 FTU in the wet season. This indicates a maximum particulate content of 17 mg/l in the wet season, which is rather low. The nutrient content of the rivers is relatively low. The phosphorus content (8-35 µgP/1)correlated well with the turbidity, which indicates that the phosphorus is bound to particles. Khe Nghi has significantly higher nitrogen content (380 µgN/l) than the other rivers, which may indicate some slight impact from animal husbandry. However, no sign of eutrophication is noticed. The content of heavy metals is low and indicates no pollution from the military activity in the area. The water has good quality for irrigation purposes. There was no indications from the analysed fish, river sediments or rice field top soil samples from the Rao Quan area of dioxin contamination of any practical significance. The content was similar to back ground levels that can be found everywhere due to diffuse atmospheric fallout. In relation to spreading of Agent Orange in 1962-1975 duriing the war, contamination in Quang Tri Province is hardly to be expected, as the application of this herbicide mainly took place in the southernmost part of the country.nb_NO
dc.description.sponsorshipStatkraft Engineering A/Snb_NO
dc.publisherNorsk institutt for vannforskningnb_NO
dc.relation.ispartofseriesNIVA-rapport;3621nb_NO
dc.rightsNavngivelse-IkkeKommersiell-DelPåSammeVilkår 3.0 Norgenb_NO
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/no/nb_NO
dc.subjectinternasjonale aktiviteternb_NO
dc.titleRao Quan Feasibility study - Phase 1: Toxic substances and contamination (Final report)nb_NO
dc.typeResearch reportnb_NO
dc.rights.holderNorsk institutt for vannforskning/Norwegian institute for water researchnb_NO
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400nb_NO
dc.source.pagenumber35nb_NO
dc.subject.keywordvannkraftnb_NO
dc.subject.keywordoppdemmingnb_NO
dc.subject.keywordkrigsforurensningnb_NO
dc.subject.keyworddioxinnb_NO
dc.subject.keywordtungmetallnb_NO
dc.subject.keywordhydropowernb_NO
dc.subject.keyworddammingnb_NO
dc.subject.keywordwarnb_NO
dc.subject.keywordtimenb_NO
dc.subject.keywordcontaminantsnb_NO
dc.subject.keyworddioxinnb_NO
dc.subject.keywordheavymetalnb_NO
dc.relation.projectO-96190nb_NO


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Navngivelse-IkkeKommersiell-DelPåSammeVilkår 3.0 Norge
Except where otherwise noted, this item's license is described as Navngivelse-IkkeKommersiell-DelPåSammeVilkår 3.0 Norge