Mras-Su River
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Course of Mras - Su ( Мрас - Су ) in the south of the catchment area of the Tom
Template: Infobox River / Obsolete
The Mras -Su (Russian Мрас - Су ), also Mrassu ( Мрассу ), is a 338 km long ( the longest river source Akmras ) left tributary of the Tom in the southern West Siberia in Russia.
Course
The Mras -Su arises in the extreme southeast of the Kemerovo Oblast - through which it flows along its entire length - not far from the border with the autonomous republics of Altai and Khakassia in the vicinity of the eponymous village Mrassu of several short spring-fed streams ( Akmras, Solmras, Tschormras, Sumras ). These have limited its origin at the northwest edge of the nearly 2000 m high Abakangebirges, which is the Westsajan upstream northwest separated by the river Abakan and the low mountain range mountain Shoria from the southeast. The longest at just under 15 km source Bach Akmras rises in about 1400 m altitude.
The Mras -Su flows through the densely forested mountain landscape Scholars Riens as their next Kondoma the most important river in predominantly northern directions in a deep valley. The river is rich in turns and rapids. He finally ends a few miles below the city Myski at about 225 m altitude in the Ob Creek Tom.
Most important tributaries of the Mras -Su are Kabyrsa, Orton and kises of right and Pysas and Bolshoi UNSAS ( " Big UNSAS " ) from the left.
Hydrographic
The catchment area of Mras -Su covers 8840 km ². In estuaries near the river reaches a width of less than 200 meters at a depth of 1.5 meters; the flow rate is in this case 1.5 m / s
The Mras -Su freezes from mid-November to April. The water flow in Myski six kilometers above the mouth, is the annual average 155 m³ / s at a minimum of 24.4 m³ / s in February and a maximum of 694 m³ / s in May.
Infrastructure and economy
The Mras -Su is not navigable, but was used until the 1990s for timber floating.
The traversed by Mras -Su and its tributaries area is only sparsely populated, mainly by members of the indigenous peoples of the Shors and Teleuts. In addition to the city Myski on the lower reaches, where the railway Novokuznetsk - Abakan and a road crossing, there is all along the river only smaller settlements, the most important Ust- Kabyrsa is at the confluence of Kabyrsa and Pysas. The entire area is accessible only by unpaved roadways.
The formerly an important forestry to their purposes ( timber removal to Mras -Su and its tributaries ) and narrow gauge railways existed, experienced as a result of the economic crisis of the 1990s, a decline, especially because of the lack of convenient transport links of the remote region. A significant part of the watershed of Mras -Su is taken against it since 1989 from Shor National Park, of which one promises to stimulate the development of tourism.