After the Second World War, the construction of another 547 small stations was planned, but only 267 were built. D��9)��Q��?�6IͿ��0����������c�t1G���c.hi=�+.����9�'Q�F:���I�|�Χ!�:�v��#A+r"�U�2F8��.�5���$b�n8R���"m�]�"]}����c�ɪ�NF�%;�A#e V�4�p��F��FW��UedR��0����u Ͻ�#d�;�yn$������a��K�.�h=S�R�2_���ó�O��n*�c�G�40|_X|˭Q|��i#[email protected]�N��~������m�k�B��Fz����w`�����rF�wGP��ŗ8���nr �KaN��Q[н�� The Salaca river rises in Lake Burtnieks in the north and flows west to the Gulf of Riga. About 50-55% of the waters of the Daugava, Venta, Lielupe and Musa rivers is melted snow, while for the Gauja and Amata rivers it is 35-40%. 0000002137 00000 n In the process of regular update of the drainage system seismic profiles in the modification of the reflected waves (CDP) were performed. Dams have been constructed for two main reasons: to control floods and to build hydro-electric power stations. The total discharge of the Velikaya amounts to 4 200 million m³/year, of which 16 percent is generated within Latvia. "The state of a tidal current when its speed is near zero, especially the moment when a reversing current changes direction and its speed is zero." It is a right tributary of the river Daugava. [4], In medieval times the Daugava was an important area of trading and navigation - part of the trade route from the Varangians to the Greeks - for transport of furs from the north and of Byzantine silver from the south. The study shows significant effects of the wind in the evolution of the river bulge, even if the wind speed was moderate (3–4 m s. Performing of long profiles and significant land areas is carried out using a low frequency dipole antenna, which allows in some cases to detect and delineate the anomalous zones of the paleokarst manifestations at depths of 5-8 m. Below figure shows an example of detection of anomalous zones on the profile along protective dam of the Riga HPP reservoir. In the process of regular update of the drainage system seismic profiles in the modification of the reflected waves (CDP) were performed. The Daugava has been a major artery of Rigan life from times of old, providing water for drinking and sanitation, a mode of transportation, and more recently three hydroelectric dams - with another controversial one planned. The profile of pre-glacial valleys on the seismic section, Volumetric reconstruction of preglacial valleys and “plumes” of coarse material from the seismic data, Manifestations of palaeokarst at the base of the left bank protection embankment of the reservoir, Earth’s surface subsidence and soil collapses, Identification of local inhomogeneities of the soil mass, Bedrock and moraine surface depth determination, Telemetric registration system for shallow seismics, Site of TES-2 new energoblock construction, Riga, Flotation waste repository of metallurgical integrated plant (Peru), THE STUDY OF THE DECOMPACTION ZONES IN SOILS BY METHOD OF NON-LONGITUDINAL HIGH RESOLUTION VSP, EVALUATION OF DRILLING SAFETY AT THE CASPIAN SHELF USING 3D SEISMIC AND SUBBOTTOM PROFILING DATA, Geotechnical study at the sites of private construction. There are about 2 250 lakes with a total area of about 850 km², most of them being small lakes with more than 10 000 lakes having a surface area of less than 1 ha (LEGMA; 2005). The cascade of the Daugava hydroelectric power plants forms continuous chain of reservoirs throughout the lower stream of the Daugava river, a substantial portion of the which is located along the buried preglacial palaeovally which depth in some places is more than 150 meters.

Flows into the Daugava River 423 km from its mouth, at Dysna city.

It is a westward-flowing river, tracing out a great curve towards its south which means it passes through northern Belarus. Crosshole seismoacoustic. 2002. Electrotomography.

Bedrock and moraine surface depth determination. Recent. Methods. Violation of the dam drainage system operation leads to pressure increase, to “pop-up” of the dam body and its possible displacement in the horizontal direction under the action of static pressure of the reservoir mass during heavy floods. Coastal west basin: It includes the small river basins at the west coast with a total area of 5 100 km².

Complex of shallow geophysics methods included GPR sounding, modification of seismic reflected, refracted and surface wave techniques, electrical resistivity tomography, the methods of natural electric field, subbottom profiling. 0000001202 00000 n The high nitrate and phosphate load of the Daugava is instrumental to the buildup of extensive phytoplankton biomass in the Baltic Sea; other European rivers contributing to such high nutrient loading of the Baltic are the Oder and Vistula Rivers. The cascade of the Daugava hydroelectric power plants forms continuous chain of reservoirs throughout the lower stream of the Daugava river, a substantial portion of the which is located along the buried preglacial palaeovally which depth in some places is more than 150 meters. Subbottom soil interior determination.

The lower reaches of the Daugava River have always played a major role in the fishing industry. Ruba, Vitebsk, Beshankovichy, Polotsk with Boris stones strewn in the vicinity, Navapolatsk, Dzisna, Verkhnedvinsk, and Druya. Latvia's capital, Riga bridges the estuary four times, lying on both banks, the city centre being 15 kilometres (9.3 mi) from the mouth and being a significant port. The negative impact of karst processes on the safety of structures is manifested in the form of increased filtration of water from reservoirs through protective dams, subsidence of dam bodies, erosion of the foundations of drainage channels. Inverted vertical seismic profiling. List of rivers of Latvia; This Vidzeme location article is a stub. The valley was formed in the pre-Quaternary time at low standing level of the Baltic sea. Methods .

During the Quaternary glaciation periods, the valley and its sleeves and tributaries were completely filled with heterogeneous moraine material. 0000001356 00000 n Surface waves attenuation analysis. Its length is 1,020 km (630 mi), of which 325 km (202 mi) are in Russia. RIGA SHIPYARD dock No. The yard is capable to accommodate PANAMAX size vessels for dry-docking and AFRAMAX size vessels for afloat repairs. Before the Second World War, about 300 such stations had been built.

Urban context History and urban construction alterations Riga is the capital of Latvia which is a Northern state of Europe. Reflected wave method. The GPR sounding as the least time-consuming method, is applied in reconnaissance studies.



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