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Emni Ankelalu
Emni Ankelalu is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. The ''tabia'' centre is in Mitslal Afras village, located approximately 20 km to the east of the ''woreda'' town Hagere Selam. Geography The ''tabia'' a hilly limestone area, along Giba River, north and away from the main road. The highest peak is Miqmat' Awra hill that occupies the centre (2195 m a.s.l.) and the lowest place at the outlet of May Qarano to Giba river (1750 m a.s.l.). Geology The following geological formations are present: * Mekelle Dolerite * Antalo Limestone totally dominates the landscape * Quaternary alluvium and freshwater tufa Geomorphology and soils The main geomorphic unit is the gently undulating Agula shale plateau with dolerite. Corresponding soil types are: * Dominant soil type: stony, dark cracking clays with good natural fertility (Vertic Cambisol) * Associated soil types ** rock outcrops, stony and shallow soils (Lithic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ethiopia
Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the Eritrea–Ethiopia border, north, Djibouti to the Djibouti–Ethiopia border, northeast, Somalia to the Ethiopia–Somalia border, east and northeast, Kenya to the Ethiopia–Kenya border, south, South Sudan to the Ethiopia–South Sudan border, west, and Sudan to the Ethiopia–Sudan border, northwest. Ethiopia has a total area of . As of 2022, it is home to around 113.5 million inhabitants, making it the List of countries and dependencies by population, 13th-most populous country in the world and the List of African countries by population, 2nd-most populous in Africa after Nigeria. The national capital and largest city, Addis Ababa, lies several kilometres west of the East African Rift that splits the country into the African Plate, Africa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay particles, but become hard, brittle and non–plastic upon drying or firing. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clay is the oldest known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been dated to around 14,000 BC, and clay tablets were the first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering. Between one-half and two-thirds of the world's population live or work in buildings made with clay, ofte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addi Azmera
Addi Azmera is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. The name refers to good spring rains (“azmera”), in relation to the local microclimate. The ''tabia'' centre is in Tukhul town, located approximately half-way between the ''woreda'' town Hagere Selam and the regional capital Mekelle. Geography The ''tabia'' stretches on both sides of the main road that climbs towards Dogu’a Tembien after passing the bridge on Giba River. The highest location are the upper slopes of Imba Dogu’a (2590 m a.s.l.) and the lowest place along Giba River (1750 m a.s.l.). It comprises cultivated plains and steeper slopes, with often good vegetation (re)growth. Geology From the higher to the lower locations, the following geological formations are present: * Mekelle Dolerite * Amba Aradam Formation * Agula Shale - there are gypsum quarries in this formation, exploited by the cement factory of Mekelle * Antalo Limestone – many quarri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Baseflow
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, " burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the water cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groundwater Recharge
Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Groundwater recharge also encompasses water moving away from the water table farther into the saturated zone. Recharge occurs both naturally (through the water cycle) and through anthropogenic processes (i.e., "artificial groundwater recharge"), where rainwater and or reclaimed water is routed to the subsurface. Processes Water is recharged naturally by rain and snow melt and to a smaller extent by surface water (rivers and lakes). Recharge may be impeded somewhat by human activities including paving, development, or logging. These activities can result in loss of topsoil resulting in reduced water infiltration, enhanced surface runo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seepage
Soil mechanics is a branch of soil physics and applied mechanics that describes the behavior of soils. It differs from fluid mechanics and solid mechanics in the sense that soils consist of a heterogeneous mixture of fluids (usually air and water) and particles (usually clay, silt, sand, and gravel) but soil may also contain organic solids and other matter.Mitchell, J.K., and Soga, K. (2005) Fundamentals of soil behavior, Third edition, John Wiley and Sons, Inc., .Powrie, W., Spon Press, 2004, ''Soil Mechanics – 2nd ed'' A Guide to Soil Mechanics, Bolton, Malcolm, Macmillan Press, 1979. Along with rock mechanics, soil mechanics provides the theoretical basis for analysis in geotechnical engineering, a subdiscipline of civil engineering, and engineering geology, a subdiscipline of geology. Soil mechanics is used to analyze the deformations of and flow of fluids within natural and man-made structures that are supported on or made of soil, or structures that are buried in soil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mekelle
Mekelle ( ti, መቐለ, am, መቀሌ, mäqälle, mek’elē) or Mekele is a special zone and capital of the Tigray Region of Ethiopia. Mekelle was formerly the capital of Enderta awraja in Tigray. It is located around north of the Ethiopian capital Addis Ababa, with an elevation of above sea level. Administratively, Mekelle is considered a Special Zone, which is divided into seven sub-cities. It is the economic, cultural, and political hub of northern Ethiopia. Mekelle has grown rapidly since 1991 with a population of 61,000 in 1984, 97,000 inhabitants in 1994 (96.5% being Tigrinya-speakers), and 170,000 in 2006 (i.e. 4% of the population of Tigray). Mekelle is the second-largest city in Ethiopia after Addis Ababa, with a population of around 545,000. It is 2.6 times larger than Adigrat, the second-largest regional center. The majority of the population of Mekelle depends on government employment, commerce, and small-scale enterprises. In 2007, Mekelle had new engineering, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Giba
Lake Giba is a reservoir under construction at the border of the Inderta; Kilte Awula'ilo and Dogu’a Tembien ''woredas'' of the Tigray Region in Ethiopia. The earthen dam that holds the reservoir is under construction in 2020. It will collect the water from the catchments of Sulluh River (969 km²), Genfel River (733 km²) and Agula'i River (692 km²). Dam characteristics The dam is aimed to provide drinking water to Mekelle and to regulate the river flow. * Dam height: 80 metres * Dam crest length: 1000 metres Capacity * Original capacity: 350 million m³ * Reservoir area: 9 km³ Average annual sediment input to the reservoir by the main rivers was calculated as 3.8 million tonnes: * Sulluh: 862,410 t * Genfel: 364,301 t * Agula'i River: 2,618,528 t Flooding The dam will occupy the wide valley bottom at the river confluences, which is currently occupied by farmlands and bushlands. The reservoir will extend into the lower Genfel and Suluh gorges, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giba Dam Under Construction
Gilberto Amauri de Godoy Filho, known as Giba (born 23 December 1976), is a Brazilian former professional volleyball player who played as an outside hitter. For much of the 2000s, he was widely regarded as one of the best volleyball players in the world. During his professional career he played in Brazil, Italy, Russia, Argentina and briefly in the United Arab Emirates. He is mostly remembered for his successes with the national team. With the Brazilian National Team he won a total of 8 South American Championships, 3 America's Cups, 8 World League titles, 3 World Grand Champions Cups, three World Championships (2002, 2006, 2010), a gold medal at the 2004 Summer Olympics and two silver medals at the 2008 and 2012 Summer Olympics, where he was the team's captain. During summer 2014, Giba retired from professional volleyball at the age of 37. Club career Giba debuted in his country for clubs such as Curitibano, Cocamar, Chapecó, São Caetano, Nipomed, Olympikus and Minas. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertisol
A vertisol, or vertosol, is a soil type in which there is a high content of expansive clay minerals, many of them known as montmorillonite, that form deep cracks in drier seasons or years. In a phenomenon known as argillipedoturbation, alternate shrinking and swelling causes ''self-ploughing'', where the soil material consistently mixes itself, causing some vertisols to have an extremely deep A horizon and no B horizon. (A soil with no B horizon is called an ''A/C soil''). This heaving of the underlying material to the surface often creates a microrelief known as '' gilgai''. Vertisols typically form from highly basic rocks, such as basalt, in climates that are seasonally humid or subject to erratic droughts and floods, or that impeded drainage. Depending on the parent material and the climate, they can range from grey or red to the more familiar deep black (known as "black earths" in Australia, "black gumbo" in East Texas, "black cotton" soils in East Africa, and "vlei soils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luvisol
Luvisols are a group of soils, comprising one of the 32 Reference Soil Groups in the international system of soil classification, the World Reference Base for Soil Resources (WRB). They are widespread, especially in temperate climates, and are generally fertile. Luvisols are widely used for agriculture. Distribution Luvisols cover 500–600 million ha of land area, mainly in the temperate zones. They form on a wide variety of mineral parent materials. In Mediterranean regions, the formation of hematite can produce red-coloured Chromic Luvisols. Description and formation The main characteristic of Luvisols is an argic horizon, a subsurface zone with higher clay content than the material above it. This typically arises as clay is washed downward by water and accumulates at greater depth. The clay minerals have not been extensively weathered and are therefore of the high-activity, 2:1 type, giving these soils high cation exchange capacities and high base saturation. In uneroded la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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