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Peculiarities of groundwater level change and climate influence

Congress: 2008
Author(s): Nazarenko Vladimir
South Federal University, Rostov-on-Don, Russia Zorge str. 40, Rostov-on-Don, Russia 344090 Tel. +7-863-2224138 Fax. +7-863-2225701

Keyword(s): groundwater, Russia, human impact
AbstractAbstract The author analyze climatic and hydrogeologic data from 9 sites collected from the middle of the twentieth century to the present in the Rostov region, highly developed industrial and agricultural region. In spite of a few confounding interregional variations in the temporal changes of surface air temperature, precipitation, evaporation, and humidity in Rostov region, it has been possible to establish statistically significant long-term trends in these key hydroclimatic variables. The difference between peculiarities of groundwater level change and climate influence in Rostov region is studied. 1. Introduction In Rostov region main aquifer is sarmat limestone. Main springs are connected with it. There are two levels of sarmat limestone in Rostov region. The upper one doesn’t contain much water connected with it, and the one below is main source of fresh water in the region. The biggest springs situated in the south of Rostov region. The main source of recharge is precipitation and groundwater from another aquifers. That is why it is important to found out what is the quantity of the precipitation income to the recharge. The estimation of the precipitation influence on groundwater level is one of the programme that is worked out by IAH since 2003. Remarkably little is known about decadal changes of hydrometeorological characteristics in Rostov region and their influence on groundwater level. In spite of the previous attention devoted to large- regimes (Budyko 1977), little effort has been dedicated to analysis of regional, long-term changes in hydrologic regimes. Since the middle of the twentieth century, an extensive hydrometeorological network has been in place in the Rostov region. Here, we analyze 50 years of data to evaluate twentieth century, hydroclimatic changes in the region. 2. Methods Our analysis were based on spatial averaging within three regions (western, central, and northern part of the region, illustrated in Fig. 1). To minimize the inherent spatial and temporal noise of highresolution time series, we analyzed seasonal and annual periods over large regions. We did not spatially average data for the eastern region because of the sparse data there. In Rostov region 3 districts with different level of human influence were studied. They are situated in north, central and southern part of Rostov region. 3. Results To estimate climate influence on groundwater level we calculate correlation. We assessed changes in climatic and hydrologic characteristics by calculating a linear trend, standard errors, coefficients of determination, and F tests for each region. Veshenskaya is situated in the northern part of Rostov region. It is not highly industrial region. The average rise in precipitation was 9,11mm yr40 over the range. The air temperature in the region decreased –0,19C yr40. Analyze of the climate influence on groundwater level showed high influence of humidity and evaporation on groundwater level. The influence of meteorological elements on groundwater level varies from 83 – 86 % (seasonal) upto 26 – 65% (annual). Morozovsk is situated in the central part of Rostov region. The average rise in precipitation was 3,86mm yr40 over the range. The air temperature in the region decreased –0,02C yr40. There is high correlation between water level and humidity and evaporation. Influence of meteorological elements varies from 60 – 70% (seasonal) upto 20 – 45% (annual). Rostov-on-Don is a highly developed industrial city with population over 1 mln people. The average rise in air temperature was 0,18mm yr40 over the range. The precipitation in the region decreased –8,3C yr40. There was noticed that although precipitation becomes higher there is no correlation with groundwater level. Moreover there is no correlation between increasing of precipitation and temperature and groundwater level rise. Influence of meteorological elements is between 35 – 40% (seasonal) and 6 – 27 % (annual). In conditions of industrial regions, the meteorological influence on groundwater level become less than in not industrial parts of Rostov region.
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