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In 13th century river was called Wogen or Woga. Download. The major rivers are Daugava, Lielupe, Gauja, Venta, and Salaca. The Musa river is a tributary of the Memele river. 0000016871 00000 n Methods . Part of the groundwater flows to the sea or is withdrawn by wells, and part is drained by the surface network. The Salaca river rises in Lake Burtnieks in the north and flows west to the Gulf of Riga. Daugava river basin: Its total area is 87 900 km², of which just over one quarter is located in Latvia. The Daugava river rises in the Russian Federation, flows through Belarus (where it is called the Western Dvina), enters Latvia in the southeast and flows northwest to the Gulf of Riga. 0000000668 00000 n Remote sensing imagery and numerical model study of river bulge evolution and dynamics in a... All site content, except where otherwise noted, is licensed under the, Geoscientific Instrumentation, Methods and Data Systems, Natural Hazards and Earth System Sciences, 'Manuscript Revision: River bulge evolution and dynamics in a non-tidal sea – Daugava River plume in the Gulf of Riga, Baltic Sea'. 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. The pressure of the regional aquifer groundwater in the sandstones of the Gauja-Amata deposits of the upper Devonian balances the weight and maintains the body of the dam of Plavinas hydroelectric power station in a stable state. [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 valley was formed in the pre-Quaternary time at low standing level of the Baltic sea. 0000002137 00000 n �T00��70(l� @!A�P�&es�� The Rezekne and Pededze rivers are two important tributaries of the Aiviekste river. Methods . %PDF-1.2 %���� This gives reason to suggest a connection of these anomalies with the manifestation of palaeokarst in bedrock sediments and high water saturation of sandy soil of a protective dam. In the buffer zone of the Plavinas HPP reservoir the shallow geophysical studies were carried out during several years from 2003 to 2009. The Daugava River had long been the biggest transport route for rafting and transportation of various materials by barges. Electrotomography. Anomalous zones are manifested at depths exceeding the depth of the clay pad in dam foundation and the roof of the gypsum and dolomites, as well as the depth of surface of the full water saturation corresponding to the water level in the reservoir. Subbottom soil interior determination. [citation needed], trade route from the Varangians to the Greeks, "Main Geographic Characteristics of the Republic of Belarus. Current speed 0.2-0.4 m / s, max. The banks of the middle section lower than in the upper and lower sections. On seismic profile along the base of the dam karsted surface areas of bedrock dolomites occur in the form of characteristic time “delays” of first breaks and reflected waves, which is then reflected in the form of the bedrock surface correlation loss on the CDP time sections and in the low-velocity anomalies of longitudinal wave velocity sections. Edith Soosaar et al. For a considerable length the profile of the valley had a canyon-like shape, which contributed to the development of karst and landslide processes on its sides. Manhattan Island Foundation. Lubans lake in the Daugava river basin is the largest lake with a surface area of almost 100 km². Surface waves attenuation analysis. 0000003849 00000 n Its total area is 3 600 km², of which more than 95 percent is located in Latvia. Dams have been constructed for two main reasons: to control floods and to build hydro-electric power stations. The river has a uniform velocity of 5.00 km/h due east. The Venta has many tributaries, but only one of them, the Abava river, exceeds 100 km in length. Inverted vertical seismic profiling. Recent. The local nature of palaeokarst manifestations, significant differences in the physical and mechanical properties of the filling material in comparison with the surrounding host rocks, increased water saturation and filtration flows create significant anomalies in geophysical fields, which create good conditions for the use of a wide range of shallow-depth geophysical methods for their area and linear mapping. Dense layers of halogen-carbonate rocks of upper Devonian sediments of Plavinas, Salaspils and Daugava units was subjected by erosion, both the clastic sandy-aleuritic sediments of Amata-Gauja unit of the upper Devonian. 3 Floating docks up to 255 M LOA X 36 M BM. 0000001202 00000 n 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. The Rezekne and Pededze rivers are two important tributaries of the Aiviekste river. 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. ��K�Enł�.��pI>6C�–#*�J��B;�e����ɩ�kw\��2EuA�{w.L�i7��ґb T|\�u���D�Y��4��4�Vϑɹj�2���P�ř�� Yn�d`o ���$�*�L N� �\@���(�� herbicides, pesticides, nitrate and phosphate). According to the Law on Water Management Latvia is divided into four river basin districts (RBD) (EC, 2015; EEA, 2015): Internal renewable surface water resources (IRSWR) are estimated at 16 540 million m³/year (Table 2) and incoming surface water resources at 17 999 million m³/year. For a considerable length the profile of the valley had a canyon-like shape, which contributed to the development of karst and landslide processes on its sides. The total discharge of the Velikaya amounts to 4 200 million m³/year, of which 16 percent is generated within Latvia. Both model and satellite images showed river water mainly contained in the bulge. The riverbed average width of the upper section 10-15 m, of the middle section 20-35 m, of the lower section 70-90 m. Depth of the river from 0.6 to 1.2 m. The gradient to the lake Dysnai 117 m / km. 2007 Honda Civic Coupe, Allegis Global Solutions Glassdoor, Vein Blockage Treatment, Hennepin Lake Liquor Damage, 2010 Acura Zdx Specs, What Plays Were Performed At The Globe Theatre, Join Us For A Bite Karaoke, Sahir Ali Bagga Songs List, Comments comments" />
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