Depositional history of sediments near a major submarine municipal wastewater outfall system
Conference
·
OSTI ID:370232
- Geological Survey, Reston, VA (United States)
Sediments deposited near the Los Angeles County Sanitation Districts` submarine outfall system contain a variety of contaminants, and the history of waste emissions is recorded in vertical concentration profiles of waste-specific molecular markers. Using cores collected in 1991 and 1992 we reconstructed the depositional history of shelf sediments by comparing distributions of three classes of hydrophobic organic compounds (DDTs, PCBs, and the long-chain alkylbenzenes) with information about their release from the outfall system and/or domestic usage patterns. These data show that the average sedimentation rate at this site during the period 1981-92 was nearly double that observed during the previous 25 years. The recent increase in sedimentation is attributable to activation of a local landslide and the occurrence of several large storms during the 1980s. Together these events have acted to mobilize a large mass of sediment for transport to offshore sediments resulting in enhanced burial of the most heavily contaminated sediments.
- OSTI ID:
- 370232
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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