Документы

Рассмотрены вопросы, связанные с проблемой колебаний уровня Каспийского моря и их влияний на прибрежную зону казах-станского сектора. По данным картирования спутниковых снимков площадь осушения в северо-восточной части Каспийского моря в период между 2005 и 2015 гг. составила 5055 км2. В некоторых районах море отступило на 25 км

The article examines recent Caspian Sea level change by using both satellite radar altimetry and satellite gravity data. The altimetry record for 2002–2015 shows a declining level at a rate that is approximately 20 times greater than the rate of global sea level rise. Seasonal fluctuations are also much larger than in the world oceans. With a clearly defined geographic region and dominant signal magnitude, variations in the sea level and associated mass changes provide an excellent way to compare various approaches for processing satellite gravity data. 

Average precipitation and evaporation in the Caspian Sea in 2000-2015.

Created by Manana Kurtabadze.

This study is an attempt to develop an integrated methodology to predict the impact of the Caspian Sea on flooding using Geographic Information Systems (GIS) and hydrodynamic modeling. A rise in the sea level might lead to major flooding events, and have a severe impact on the spatial development of cities and regions. The feasibility of simulating a flood event along a drain channel is evaluated near residential development areas along the Chapakroud drain.

The study shows that at these elevations environmental and social problems arise with regards to the drain. The results also indicate that GIS is an effective tool for floodplain visualization and analysis. It should be noted that the mixture of salt and soft water, as a result of rising sea water level, is a problem that was not investigated in this study and should be examined in the future. 

Sampling was conducted from the vessel Svetlomor 2 by personnel from AmC, the Ministry of Ecology and Natural Resources (MENR) and SOCAR. Sediment samples for physical and chemical analysis consisted of 2 replicates, while 3 replicates were taken for biological analyses. Analyses were carried out at AmC Caspian Environmental Laboratory.

The sediment characteristics and metal concentrations around Chirag were found to be highly variable within and between stations, with generally little change being observed from 2008. Despite the detection footprint remaining unchanged from previous years, LAO concentrations continue to reduce. THC and PAH concentrations were generally low, with the highest concentrations being recorded at stations directly to the northeast of the platform.

Ba concentrations were highest within the LAO contamination footprint, suggesting the higher concentrations to be the result of historical drilling discharges. As observed on previous years the concentration of Cd was also highest within this area. The LAO and Ba footprint, indicating the extent of contamination from platform drilling discharges was found to extend 1250m NE, 500m N, 750m E, 1000m W and 250m S of the Chirag platform position.

The 2010 macrobenthic community was numerically dominated by polychaetes and amphipods.

Abundance and species richness were highest at stations on the periphery of the survey area and decreased towards the platform. The lowest abundance an taxonomic richness were found at stations within the LAO and Ba footprint, with the sparsest communities being present at stations directly to the northeast of the platform. Despite a continual reduction in hydrocarbon concentrations from 2006, a general reduction in abundance and taxonomic richness has been observed at the Chirag survey area from 2000 to 2008. This negative trend has reversed in 2010, with a survey wide increase in annelid abundance and amphipod abundance and taxonomic richness being observed. No distinct change in the physicochemical characteristics has been observed between 2008 and 2010 that can be attributed to the abrupt reversal of these trends.

No additional physicochemical impacts from operational activities have been observed between 2008 and 2010 and in general contamination levels continue to reduce