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Yellow River Delta National Nature Reserve
The Yellow River Delta National Nature Reserve (YRDNNR) is a protected area in the city of Dongying, China, which covers wetland habitats on the shore of the Bohai Sea. These wetlands are formed through the deposition of silt by the Yellow River, forming a large and growing delta. The reserve is split geographically into two portions, one covering the current mouth of the Yellow River and one covering wetlands that remain near a former river mouth. In management terms, it is divided into a core area with a high level of protection, and buffer and experimental zones which allow for greater human activity. The current river delta area only became widely settled in the 20th century. The discovery of the Shengli Oil Field brought significant economic activity to the area, and the city of Dongying was founded in 1983. The wetland ecosystem was degraded by the impact of economic activity within what became Dongying, as well as by inland agriculture which reduced water levels in the Yel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bohai Sea
The Bohai Sea ( zh, c=渤海, p=Bó Hǎi, l=Bo Sea) is a gulf/inland sea approximately in area on the east coast of Mainland China. It is the northwestern and innermost extension of the Yellow Sea, to which it connects via the Bohai Strait. It has a mean depth of approximately , with a maximum depth of about located in the northern part of the Bohai Strait. The Bohai Sea is enclosed by three provinces of China, provinces and one direct-administered municipalities of China, direct-administered municipality from three different list of regions of China, regions of China—Liaoning, Liaoning Province (of Northeast China), Hebei, Hebei Province and Tianjin, Tianjin Municipality (of North China), and Shandong, Shandong Province (of East China). It is the center of the Bohai Economic Rim, and its proximity to the Chinese capital of Beijing and the direct-administered municipalities of China, municipality of Tianjin makes it one of the busiest seaways in the world. The entrance to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siberian Crane
The Siberian crane (''Leucogeranus leucogeranus''), also known as the Siberian white crane or the snow crane, is a bird of the family Gruidae, the crane (bird), cranes. They are distinctive among the cranes: adults are nearly all White, snowy white, except for their black Flight feather, primary feathers that are visible in flight, and with two Population ecology, breeding populations in the Arctic tundra of western and Russian Far East, eastern Russia. The eastern populations bird migration, migrate during winter to China, while the western population winters in Iran and (formerly) in Bharatpur district, Bharatpur, India. Among the cranes, they make the longest distance Animal migration, migrations. Their populations, particularly those in the western range, have declined drastically in the 20th century due to Fowling, hunting along their migration routes and habitat destruction, habitat degradation. The world population was estimated in 2010 at about 3,200 birds, mostly belongin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monsoon Continental Climate
The Monsoon continental climate, also known as Manchurian climate, is a continental climate sub-type. It is a monsoon climate with a large thermal range. It is located mainly in East Asia, Korea and Manchuria. Its dry season happens during the winter (The “w” in “Dw” stands for “winter”). Sub-types There are four subtypes of the monsoon continental climate, determined by the third letter (Dwx) * Hot-summer monsoonal continental climate (Dwa): Mean temperature is below in the coldest month. Mean temperature is above . Winter is very dry compared to summer. This climate is located in Northeast China and the Korean Peninsula. (Examples: Beijing, Harbin, Shenyang, Pyongyang, Seoul, North Platte) * Warm-summer monsoonal continental climate (Dwb): Mean temperature is below in the coldest month. Mean temperature is below in the hottest month, but at least 4 months are above . Winter is very dry compared to summer. This climate is located in Northeast China, far southeaster ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Delta
A river delta is a landform, archetypically triangular, created by the deposition of the sediments that are carried by the waters of a river, where the river merges with a body of slow-moving water or with a body of stagnant water. The creation of a river delta occurs at the '' river mouth'', where the river merges into an ocean, a sea, or an estuary, into a lake, a reservoir, or (more rarely) into another river that cannot carry away the sediment supplied by the feeding river. Etymologically, the term ''river delta'' derives from the triangular shape (Δ) of the uppercase Greek letter delta. In hydrology, the dimensions of a river delta are determined by the balance between the watershed processes that supply sediment and the watershed processes that redistribute, sequester, and export the supplied sediment into the receiving basin. River deltas are important in human civilization, as they are major agricultural production centers and population centers. They can provide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Mouth
A river mouth is where a river flows into a larger body of water, such as another river, a lake/reservoir, a bay/gulf, a sea, or an ocean. At the river mouth, sediments are often deposited due to the slowing of the current, reducing the carrying capacity of the water. The water from a river can enter the receiving body in a variety of different ways. The motion of a river is influenced by the relative density of the river compared to the receiving water, the rotation of the Earth, and any ambient motion in the receiving water, such as tides or seiches. If the river water has a higher density than the surface of the receiving water, the river water will plunge below the surface. The river water will then either form an underflow or an interflow within the lake. However, if the river water is lighter than the receiving water, as is typically the case when fresh river water flows into the sea, the river water will float along the surface of the receiving water as an overflow. Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidal Range
Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun, by Earth's rotation and by centrifugal force caused by Earth's progression around the Earth-Moon barycenter. Tidal range depends on time and location. Larger tidal range occur during spring tides (spring range), when the gravitational forces of both the Moon and Sun are aligned (at syzygy), reinforcing each other in the same direction ( new moon) or in opposite directions ( full moon). The largest annual tidal range can be expected around the time of the equinox if it coincides with a spring tide. Spring tides occur at the second and fourth (last) quarters of the lunar phases. By contrast, during neap tides, when the Moon and Sun's gravitational force vectors act in quadrature (making a right angle to the Earth's orbit), the difference between high and low tides (neap range) is smallest. Neap ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laizhou Bay
Laizhou Bay () is a bay on the southern shore of the Bohai Sea (also known as the ''Bohai Gulf'', or just ''Bo Hai'', which is a large and relatively shallow westward extension of the northern Yellow Sea), bounded by the northwestern coastline of the Shandong Peninsula west of the Port of Longkou and the eastern coastline of Dongying south of the Yellow River estuary. It is named after the county-level city A county-level city () is a County-level divisions of China, county-level administrative division of the China, People's Republic of China. County-level cities have judiciary, judicial but no legislature, legislative rights over their own local or ... of Laizhou to its east, and is the smallest of the three main bays of the Bohai Sea (the other two being the Liaodong Bay to the north, and the Bohai Bay to the west). See also * Laizhou References *Tom McKnight, PhD, et al.; ''Geographica'' (ATLAS), 1999–2004, 3rd revision, Barnes and Noble Books AND Random House ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellow River Delta
The Yellow River, also known as Huanghe, is the second-longest river in China and the sixth-longest river system on Earth, with an estimated length of and a watershed of . Beginning in the Bayan Har Mountains, the river flows generally eastwards before entering the long Ordos Loop, which runs northeast at Gansu through the Ordos Plateau and turns east in Inner Mongolia. The river then turns sharply southwards to form the border between Shanxi and Shaanxi, turns eastwards at its confluence with the Wei River, and flows across the North China Plain before emptying into the Bohai Sea. The river is named for the yellow color of its water, which comes from the large amount of sediment discharged into the water as the river flows through the Loess Plateau. The Yellow River basin was the birthplace of ancient Chinese civilization. According to traditional Chinese historiography, the Xia dynasty originated on its banks around 2100 BC; Sima Qian's ''Shiji'' () record that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soil Salinity
Soil salinity is the salt (chemistry), salt content in the soil; the process of increasing the salt content is known as salinization (also called salination in American and British English spelling differences, American English). Salts occur naturally within soils and water. Salinization can be caused by natural processes such as mineral weathering or by the gradual withdrawal of an ocean. It can also come about through artificial processes such as irrigation and Sodium_chloride#Road_salt, road salt. Natural occurrence Salt (chemistry), Salts are a natural component in soils and water. The ions responsible for salinization are: Sodium, Na+, Potassium, K+, Calcium, Ca2+, Magnesium, Mg2+ and Chlorine, Cl−. Over long periods of time, as soil minerals weathering, weather and release salts, these salts are flushed or leached out of the soil by drainage water in areas with sufficient precipitation. In addition to mineral weathering, salts are also deposited via dust and precipitatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Reclamation
Land reclamation, often known as reclamation, and also known as land fill (not to be confused with a waste landfill), is the process of creating new Terrestrial ecoregion, land from oceans, list of seas, seas, Stream bed, riverbeds or lake beds. The land reclaimed is known as reclamation ground, reclaimed land, or land fill. History In ancient Egypt, the rulers of the Twelfth Dynasty of Egypt, Twelfth Dynasty (c. 2000–1800 BC) undertook a far-sighted land reclamation scheme to increase agricultural output. They constructed levees and canals to connect the Faiyum Oasis, Faiyum with the Bahr Yussef waterway, diverting water that would have flowed into Lake Moeris and causing gradual evaporation around the lake's edges, creating new farmland from the reclaimed land. A similar land reclamation system using dams and drainage canals was used in the Greek Lake Copais, Copaic Basin during the Middle Helladic period, Middle Helladic Period (c. 1900–1600 BC). Another early large-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agriculture
Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in the cities. While humans started gathering grains at least 105,000 years ago, nascent farmers only began planting them around 11,500 years ago. Sheep, goats, pigs, and cattle were domesticated around 10,000 years ago. Plants were independently cultivated in at least 11 regions of the world. In the 20th century, industrial agriculture based on large-scale monocultures came to dominate agricultural output. , small farms produce about one-third of the world's food, but large farms are prevalent. The largest 1% of farms in the world are greater than and operate more than 70% of the world's farmland. Nearly 40% of agricultural land is found on farms larger than . However, five of every six farm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
