DBPapers
DOI: 10.5593/SGEM2014/B53/S21.018

ENVIRONMENTAL AND ECONOMIC ASPECTS OF SMALL FRESHWATER LAKE SUSTAINABLE USE: LAKE PILVELIS EXAMPLE

K. Stankevica, J. Burlakovs, M. Klavins, Z. Vincevica-Gaile
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-19-3 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 3, 127-134 pp

ABSTRACT
Climatic conditions in Latvia support the process of overgrowing of freshwater bodies due to natural and anthropogenic eutrophication process - sapropel or gyttja is the freshwater organic sediment transformed in genetic processes and mixed with mineral components. From economic point of view this sediment is subterranean renewable resource that can be used in agriculture, construction, chemical processing, cosmetology and medicine. Recultivation of overgrown lakes can be provided by sapropel removal, but the pumping, storage, logistics and processing should be planned carefully. Thus more suitable habitats for fish can be restored and landscape becomes more attractive; benefits can be gained by investing minimal resources. Remediation works in lakes of Latvia with the water depth less than 3 m can to be promoted as the lake bed is filled with organic rich sediments. Significant economic benefits from the resources extracted can be achieved by project developers, municipalities and other stakeholders. However, these works should consider price fluctuations and logistical aspects as well as the impact to the environment. The aim of this article was to provide comparison of various sapropel extraction scenarios by analysing costs, removal rates and amount of the resource based on Lake Pilvelis economic calculations example.

Keywords: sapropel, gyttja, restoration of lakes, cost-benefit analysis, removal rates