Konsekvenser av regulære utslipp til sjø – RKU Norskehavet

Rapporten gir en vurdering av mulige miljøeffekter fra regulære utslipp på regionalt nivå i Norskehavet basert på oppdaterte planer for drift og utbygging av oljevirksomheten. Nye forskningsresultater oppsummeres og konsekvenser av regulære utslipp til sjø er vurdert ut fra underrapporter basert på spredning av utslipp og tilstedeværelse av naturressurser.Statoil på vegne av OL

Konsekvenser av regulære utslipp til sjø – RKU Norskehavet

Rapporten gir en vurdering av mulige miljøeffekter fra regulære utslipp på regionalt nivå i Norskehavet basert på oppdaterte planer for drift og utbygging av oljevirksomheten. Nye forskningsresultater oppsummeres og konsekvenser av regulære utslipp til sjø er vurdert ut fra underrapporter basert på spredning av utslipp og tilstedeværelse av naturressurser

EKOREEF - Report 4: lmpacts and waste management

This project comprises 3 aspects: 1. To assess the positive and negative environmental impacts of the construction, short-term and long-term reuse of Ekofisk structures as artificial reefs. 2. To predict the socio-economic consequences of such a strategy. 3. A plan for the management of material thait cannot be lett on the reef will be proposed. The findings of this report are to be summarised and simplified in a main report for the Ekoreef programme

EKOREEF - Report 4: lmpacts and waste management

This project comprises 3 aspects: 1. To assess the positive and negative environmental impacts of the construction, short-term and long-term reuse of Ekofisk structures as artificial reefs. 2. To predict the socio-economic consequences of such a strategy. 3. A plan for the management of material thait cannot be lett on the reef will be proposed. The findings of this report are to be summarised and simplified in a main report for the Ekoreef programme

Species sensitivity distributions for suspended clays, sediment burial and grain size change in the marine environment

Assessment of the environmental risk of discharges, containing both chemicals and suspended solids (e.g., drilling discharges to the marine environment), requires an evaluation of the effects of both toxic and nontoxic pollutants. To date, a structured evaluation scheme that can be used for prognostic risk assessments for nontoxic stress is lacking. In the present study we challenge this lack of information by the development of marine species sensitivity distributions (SSDs) for three nontoxic stressors: suspended clays, burial by sediment, and change in sediment grain size. Through a literature study, effect levels were obtained for suspended clays, as well as for burial of biota. Information on the species preference range for median grain size was used to assess the sensitivity of marine species to changes in grain size. The 50% hazardous concentrations (HC50) for suspended barite and bentonite based on 50% effect concentrations (EC50s) were 3,010 and 1,830 mg/L, respectively. For burial the 50% hazardous level (HL50) was 5.4 cm. For change in median grain size, two SSDs were constructed; one for reducing and one for increasing the median grain size. The HL50 for reducing the median grain size was 17.8 ¿m. For increasing the median grain size this value was 305 ¿m. The SSDs have been constructed by using information related to offshore oil- and gas-related activities. Nevertheless, the results of the present study may have broader implications. The hypothesis of the present study is that the SSD methodology developed for the evaluation of toxic stress can also be applied to evaluate nontoxic stressors, facilitating the incorporation of nontoxic stressors in prognostic risk assessment tools