Coastal environments and oil spill residues in Chedabucto Bay, Nova Scotia

1976 ◽  
Vol 13 (7) ◽  
pp. 908-928 ◽  
Author(s):  
E. H. Owens ◽  
M. A. Rashid
Keyword(s):  
Nova Scotia ◽  
Oil Spill ◽  
Littoral Zone ◽  
Wave Activity ◽  
Sediment Supply ◽  
Chemical Degradation ◽  
Coastal Environments ◽  
Sediment Removal ◽  
Natural Processes ◽  
Physical And Chemical

Investigations following the oil spill from the tanker ARROW in Chedabucto Bay, Nova Scotia, in 1970 have focussed on the physical and chemical degradation of the Bunker C oil in different littoral environments and on the effects of sediment removal to restore polluted beaches. Natural processes have restored the beaches effectively on coasts exposed to wave activity. In sheltered, low-energy areas, the oil has undergone relatively little change over the 3-year period and is still present in the littoral zone. The removal of contaminated sediments from exposed beaches has not caused major changes but has resulted in permanent retreat of the beach crest in areas of limited sediment supply.

Changes in Beach Profiles at Chedabucto Bay, Nova Scotia, Following Large-scale Removal of Sediments

1973 ◽  
Vol 10 (8) ◽  
pp. 1226-1232 ◽  
Author(s):  
E. H. Owens ◽  
G. Drapeau
Keyword(s):  
Nova Scotia ◽  
Oil Spill ◽  
Large Scale ◽  
Normal Wave ◽  
High Energy ◽  
Wave Action ◽  
Scale Removal ◽  
Sediment Removal ◽  
One Year

The effects of sediment removal on three beaches have been monitored during a one year period following attempts to clean up an oil spill in Chedabucto Bay, Nova Scotia. Profiles of these beaches are compared with those surveyed on a high energy beach on Crichton Island which was not affected by cleaning operations. It is apparent on beaches affected by cleaning operations that sediments removed from areas beyond the limit of normal wave action have not been replaced. Excessive sediment removal can seriously alter the equilibrium of a beach and this was demonstrated by a 20-m retreat of the beach crest at the eastern end of Indian Cove.

scholarly journals Coastal Evolution Over the Past 3000 Years at Conrads Beach, Nova Scotia: the Influence of Local Sediment Supply on a Paraglacial Transgressive System

2015 ◽  
Vol 39 (2) ◽  
pp. 363-384 ◽  
Author(s):  
Tanya C. Forde ◽  
Mladen R. Nedimović ◽  
Martin R. Gibling ◽  
Donald L. Forbes
Keyword(s):  
Nova Scotia ◽  
Sediment Supply ◽  
Coastal Evolution ◽  
The Past

scholarly journals Enzymes Involved in Plastic Degradation

2021 ◽  
pp. 95-110
Author(s):  
S.Z.Z. Cobongela
Keyword(s):  
Polyethylene Terephthalate ◽  
Synthetic Polymers ◽  
Chemical Degradation ◽  
Natural Resistance ◽  
Aquatic Life ◽  
Carbon Backbone ◽  
Catabolic Enzymes ◽  
Plastic Degradation ◽  
Global Increase ◽  
Physical And Chemical

The global increase in production of plastic and accumulation in the environment is becoming a major concern especially to the aquatic life. This is due to the natural resistance of plastic to both physical and chemical degradation. Lack of biodegradability of plastic polymers is linked to, amongst other factors, the mobility of the polymers in the crystalline part of the polyesters as they are responsible for enzyme interaction. There are significantly few catabolic enzymes that are active in breaking down polyesters which are the constituents of plastic. The synthetic polymers widely used in petroleum-based plastics include polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polyurethane (PUR), polystyrene (PS), polyamide (PA) and polyethylene terephthalate (PET) being the ones used mostly. Polymers with heteroatomic backbone such as PET and PUR are easier to degrade than the straight carbon-carbon backbone polymers such as PE, PP, PS and PVC.

scholarly journals First Record of Age 0+ Atlantic Whitefish, Coregonus huntsmani, from the Wild

2005 ◽  
Vol 119 (2) ◽  
pp. 294 ◽  
Author(s):  
Dan J. Hasselman ◽  
Phillip Longue ◽  
Rod G. Bradford
Keyword(s):  
Nova Scotia ◽  
Littoral Zone ◽  
First Record ◽  
Early Summer ◽  
Smallmouth Bass ◽  
Single Individual ◽  
Small School ◽  
Beach Seine ◽  
Young Of The Year

A small school of juvenile Atlantic Whitefish (~20-30 individuals) were observed in the littoral zone of Hebb Lake (Petite Rivière watershed), Nova Scotia in June 2000. Of these, a single individual was captured with a beach seine, and confirmed to be a young-of-the-year specimen. This is the first documented report of the occurrence of wild Atlantic Whitefish juveniles. Occupation of the littoral zone into early summer by young-of-the-year Atlantic Whitefish may have implications for predation by invasive Smallmouth Bass.

OIL SPILL RESPONSE PLANNING IN TROPICAL COASTAL ENVIRONMENTS

1985 ◽  
Vol 1985 (1) ◽  
pp. 639-639
Author(s):  
Thomas G. Ballou ◽  
Charles D. Getter ◽  
Bart J. Baca ◽  
Mohammad Al-Sarawi ◽  
Christine L. Vilardi
Keyword(s):  
Oil Spill ◽  
Coastal Environments ◽  
Response Planning ◽  
Oil Spill Response

Why Sample? - Understanding Common Sampling Objectives for Oil Spill Response

2017 ◽  
Vol 2017 (1) ◽  
pp. 2561-2580
Author(s):  
Angeline Morrow ◽  
Christopher Pfeifer ◽  
Victoria Broje ◽  
Rachel Grunberg
Keyword(s):  
Decision Making ◽  
Oil Spill ◽  
Health And Safety ◽  
Chemical Properties ◽  
Alternative Response ◽  
Response Options ◽  
Worker Health And Safety ◽  
Oil Spill Response ◽  
Key Aspects ◽  
Physical And Chemical

ABSTRACT #2017-204: There is a growing recognition of the role science plays in supporting oil spill response coupled with increasing reliance on data-driven management and decision-making approaches. Collecting samples for analysis of hydrocarbons and other chemicals potentially used during oil spill response (e.g., dispersants) has become common place on many spills. While the rationale and approaches for oil spill sampling may be well known to experienced chemists and environmental scientists, the response community is still gaining experience in integrating sampling programs into dynamic oil spill response and decision-making. This paper reviews common sampling objectives for three key aspects of spill response: operational decision-support, environmental impact assessment (including natural resource damage assessment), and source identification. These broad categories span a range of interrelated sub-topics including, among others, public/worker health and safety; understanding how physical and chemical properties of oil influence selection of response options; monitoring cleanup effectiveness, especially for alternative response technologies such as dispersants; identifying and differentiating between spill and non-spill pollution sources; and evaluating potential impacts to resources at risk. Methods for achieving sampling objectives, including development of Sampling and Analysis Plans, are discussed with the goal of increasing awareness among response managers and improving response capability among staff who may be tasked with sampling support during training exercises or actual incidents. Relevant considerations for study design, collection methods, and analytical parameters are also reviewed.

Long term monitoring of sewer sediment accumulation and flushing experiments in a man-entry sewer

2006 ◽  
Vol 54 (6-7) ◽  
pp. 109-117 ◽  
Author(s):  
J.-L. Bertrand-Krajewski ◽  
J.-P. Bardin ◽  
C. Gibello
Keyword(s):  
Field Experiments ◽  
Sediment Accumulation ◽  
Clear Correlation ◽  
Sediment Removal ◽  
Sediment Volume ◽  
Sediment Mass ◽  
Physical And Chemical ◽  
Parameter Values ◽  
Continuous Field

This paper presents continuous field experiments carried out during 4 years in a man-entry egg-shaped combined sewer in Lyon, France in order to contribute to the knowledge and the modelling of sediment accumulation and sediment removal by means of a Hydrass flushing gate. The 250 μm sediments are mainly mineral, and their physical and chemical characteristics appear as rather stable in time and space. Long-term sediment monitoring reveals: i) a regular asymptotic increase of both the sediment mass and the slope of its longitudinal profile, ii) a clear correlation between local sediment profile irregularities and sewer ancillaries but without significant influence on the global and long term accumulation. Simple sediment accumulation modelling shows: i) a good suitability of a three parameters conceptual model to reproduce asymptotic sediment volume accumulation, and ii) a good suitability of the Velikanov model to reproduce sediment profiles. Both models reproduce observations with an acceptable margin of uncertainty for operational management purposes but are very sensitive to input data and parameter values. The Hydrass flushing gate is efficient and it appeared that the mass of sediments moves downstream linearly with the number of flushes.

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