Опасные геологические процессы на территории г. Ханой (Вьетнам)
| Parent link: | Вестник Томского государственного университета/ Национальный исследовательский Томский государственный университет (ТГУ).— , 1998- № 349.— 2011.— [С. 200-203] |
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| Özet: | Заглавие с экрана Как геологическое строение и история геологического развития, тектоника, так и физико-географическое положение и климат региона определяют проявление экзогенных геологических процессов, которые имеют место на территории Ханоя. Самыми важными из инженерно-геологических факторов являются расположение города в рифтовой зоне р. Красная, наличие мощной толщи слабых водонасыщенных грунтов, понижение уровня грунтовых вод и оседание поверхности земли. Geological structure and history of geological evolution, tectonics, as well as physical and geographical position and climate, are controlling factors of exogenous processes that take place in the territory of Hanoi. The most important of the engineering geological factors are tectonic faults, presence of thick series of unstable soils and sinking of ground waters level and settlement of earth surface. Hanoi, the capital of Vietnam, is a city with an area of more than 3.3 thousand km2 and 6.2 million people, located in the delta area of the Red River (Bac Bo Plain). It is flat and filled with alluvial soils brought by the Red River. It consists of Neocene and quaternary sediments. The quaternary sediments are divided into two sediments (Pleistocene and Holocene). The Pleistocene sediments are formed by gravel, sand and clay and divided into three formations: 1. Le Chi formation: it consists of gravel interstratified with lenses of clayey silt. The thickness ranges from 25.0 to 30.0 m.; 2. Hanoi formation: it consists of gravel intermixed with sandy silty clay. The thickness ranges from 20.0 to 24.5 m.; 3. Vinh Phuc formation: it consists of marine sediments of sand, silt mixed with pebbles in the lower part, and layers of silty clay in the upper part. The thickness is 10.0 to 45.0 m. The Holocene sediments are divided into two formations: 1. Hai Hung formation: it consists of clayey silt and sandy layers. The upper part of this sedimentary formation consists of a layer of marine clay with organic substances. The thickness is from 0.6 to 20.0 m.; 2. Thai Binh formation: it consists of clayey silt mixed with pebbly sand layers, of alluvial-proluvial genesis. The alluvial swamp sediments consist of clay and peat. The thickness is from 0.9 to 35.0 m. Most of the ground water under the Hanoi plain is found in the quaternary sediments, in two mains aquifers (Holocene and Pleistocene). The Holocene aquifer is sufficient for small-scale water supply. The Pleistocene aquifer consists of alluvial sand, gravel, pebble and cobble. The thickness of aquifer varies from several meters to tens of meters. The aquifer has a significant potential for the supply of groundwater. At present, the total water withdrawal is estimated about 750,000 m3/day. Land subsidence was developed in the central and southeast parts of Hanoi where groundwater is extensively exploited. The city of Hanoi is underlain by sediments, including organic and inorganic clays, silt, peat, that are compressible. The demand for groundwater supply of Hanoi has increased ceaselessly, especially in the recent 15 years. Combining these two factors, land subsidence is an obvious geotechnical problem that Hanoi is facing. Режим доступа: по договору с организацией-держателем ресурса |
| Dil: | Rusça |
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2011
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| Online Erişim: | http://elibrary.ru/item.asp?id=16560010 http://journals.tsu.ru/vestnik/&journal_page=archive&id=862&article_id=5876 |
| Materyal Türü: | Elektronik Kitap Bölümü |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=653767 |