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Ogof Hesp Alyn
Ogof Hesp Alyn (Welsh for: ''Dry Alyn Cave'') was discovered by North Wales Caving Club in 1973 in the Alyn Gorge near Cilcain, Flintshire, Wales. Reaching the end of the cave is a serious commitment involving 24 pitches and the draining of two sumps. The proliferation of short, awkward and muddy pitches appear best suited to be tackled by wire ladders, but in the 1980s a team of divers from the Wessex Caving Club who passed the sumps, concluded that single rope technique was preferable, avoiding the need for excessive numbers of people to carry the equipment. A perpetual siphon has since been used at the first sump which does a good job of keeping the water level relatively low, when working properly. A BCRA grade 5b survey of the cave exists that was created by North Wales Caving Club in two phases, in periods during the original 70s exploration, and further exploration beyond the sumps in the 80s. As well as the main passage that meanders through the cave there are several ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alyn Gorge
The Alyn Gorge is a gorge section of the River Alyn north between Loggerheads and Rhydymwyn in Wales. The west side of the valley rises gently to Moel Famau, while the east bank is along parts a cliff with evidence of tram lines and old quarry workings. The path along the edge of the gorge is well maintained, with metal bridges and barriers across sites which are popular with climbers. The character of the gorge changes at Cilcain where a small bridge crosses the watercourse at . The water sinks into the river bed a hundred metres north from this place and enters the caves Ogof Hen Ffynhonnau and Ogof Hesp Alyn, which were discovered in the 1970s after the watertable had changed due to the mine-workings earlier in the century. High on the east bank near these two entrances is the small cave of Ogof Nadolig. The Alyn Gorge and caves have been designated as a Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flintshire
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Wales
Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in 2021 of 3,107,500 and has a total area of . Wales has over of coastline and is largely mountainous with its higher peaks in the north and central areas, including Snowdon (), its highest summit. The country lies within the Temperateness, north temperate zone and has a changeable, maritime climate. The capital and largest city is Cardiff. Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, and Wales was formed as a Kingdom of Wales, kingdom under Gruffydd ap Llywelyn in 1055. Wales is regarded as one of the Celtic nations. The Conquest of Wales by Edward I, conquest of Wales by Edward I of England was completed by 1283, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welsh Language
Welsh ( or ) is a Celtic language family, Celtic language of the Brittonic languages, Brittonic subgroup that is native to the Welsh people. Welsh is spoken natively in Wales, by some in England, and in Y Wladfa (the Welsh colony in Chubut Province, Argentina). Historically, it has also been known in English as "British", "Cambrian", "Cambric" and "Cymric". The Welsh Language (Wales) Measure 2011 gave the Welsh language official status in Wales. Both the Welsh and English languages are ''de jure'' official languages of the Welsh Parliament, the Senedd. According to the 2021 United Kingdom census, 2021 census, the Welsh-speaking population of Wales aged three or older was 17.8% (538,300 people) and nearly three quarters of the population in Wales said they had no Welsh language skills. Other estimates suggest that 29.7% (899,500) of people aged three or older in Wales could speak Welsh in June 2022. Almost half of all Welsh speakers consider themselves fluent Welsh speakers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cilcain
Cilcain is a village and community, near Mold in Flintshire, north-east Wales. The village has an industrial history and includes the Millennium Woods, a post office, a public house, a parish church, a primary school (Ysgol y Foel) and a village hall. Cilcain borders the parishes of Rhosesmor, Rhes-y-cae and Rhydymwyn. The community includes the village of Rhydymwyn. Name The Welsh placename Cilcain, which has also in the past been spelled as Kilken and Cilcen, has been suggested to derive from ''cil'' meaning 'retreat' and ''cain'' meaning 'fair' or 'pleasant' in the Welsh language. Early Cilcain In the early years of Cilcain's existence it was noted as a place of retreat and was also locally famous for its regular village fairs, where a notable amount of alcohol was often consumed. Cilcain was also known for cockfighting, which took place on Sundays after the local church service. Church The first recorded mention of the church at Cilcain dates from 1291. Cilcain is one ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single Rope Technique
Single-rope technique (SRT) is a set of methods used to descend and ascend on the same single rope. Single-rope technique is used in caving, potholing, rock climbing, canyoning, roped access for building maintenance and by arborists for tree climbing, although to avoid confusion in the tree climbing community, many have taken to calling it "stationary" rope technique. Single-rope technique is used in contrast to double-rope technique (DRT), also known as moving-rope technique. Historical developments In the 1930s, as caving became increasingly popular in France, several clubs in the Alps made vertical cave exploration an outdoor sport. During World War II, a team composed of Pierre Chevalier, Fernand Petzl, Charles Petit-Didier and others explored the Dent de Crolles cave system near Grenoble, France, which became the deepest explored cave in the world (-658m) at that time. The lack of available equipment during the war forced Pierre Chevalier and the rest of the team to develo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perpetual Siphon
Perpetual, meaning "eternal", may refer to: Christianity * Perpetual curacy, a type of Christian priesthood in Anglicanism * Perpetual virginity of Mary, one of the four Marian dogmas in Catholicism Finance *Perpetual bond, a bond that pays coupons forever *Perpetual plc, a British investment management company which became Invesco Perpetual *Perpetual Limited, an Australian diversified financials company *Perpetuity, a perpetual asset Other *Perpetual Entertainment, an American software development company *Perpetual Maritime Truce, the treaty defining peaceful relations in the Trucial States, today the United Arab Emirates. *Perpetual motion (other) *Perpetual Union, a concept in American constitutional law and a feature of the Articles of Confederation, which established the United States as a national entity See also * Perpetua (other) Perpetua and Felicity (died 203) were Christian martyrs. Perpetua or Perpétua may also refer to: People * Perpe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phreatic
''Phreatic'' is a term used in hydrology to refer to aquifers, in speleology to refer to cave passages, and in volcanology to refer to a type of volcanic eruption. Hydrology The term phreatic (the word originates from the Greek , meaning "well" or "spring") is used in hydrology and the earth sciences to refer to matters relating to ground water (an aquifer) below the water table. The term 'phreatic surface' indicates the location where the pore water pressure is under atmospheric conditions (i.e. the pressure head is zero). This surface normally coincides with the water table. The slope of the phreatic surface is assumed to indicate the direction of ground water movement in an unconfined aquifer. The phreatic zone, below the phreatic surface where rock and soil is saturated with water, is the counterpart of the vadose zone, or unsaturated zone, above. Unconfined aquifers are also referred to as phreatic aquifers because their upper boundary is provided by the phreatic surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vadose Zone
The vadose zone, also termed the unsaturated zone, is the part of Earth between the land surface and the top of the phreatic zone, the position at which the groundwater (the water in the soil's pores) is at atmospheric pressure ("vadose" is from the Latin word for "shallow"). Hence, the vadose zone extends from the top of the ground surface to the water table. Water in the vadose zone has a pressure head less than atmospheric pressure, and is retained by a combination of adhesion (''funiculary groundwater''), and capillary action (''capillary groundwater''). If the vadose zone envelops soil, the water contained therein is termed soil moisture. In fine grained soils, capillary action can cause the pores of the soil to be fully saturated above the water table at a pressure less than atmospheric. The vadose zone does not include the area that is still saturated above the water table, often referred to as the capillary fringe. Freeze, R.A. and Cherry, J.A., 1979. Groundwater. Engl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ogof Hen Ffynhonnau
Ogof Hen Ffynhonnau (sometimes known in English as Poacher's Cave) lies in the Alyn Gorge in Flintshire, Wales close to Ogof Hesp Alyn. It was discovered in 1978 after excavation allowed access to Dyer's Adit. Being below a dry river bed, the cave can be prone to flooding in wet weather. There is a short ladder pitch just inside the entrance, and it makes a short trip suitable for novice cavers. History The name Poacher's Cave was coined during an acrimonious dispute between the Northern Pennine Club Northern Pennine Club (NPC) is one of the oldest and largest caving clubs in the UK. Founded in 1946, the Northern Pennine Club was one of the caving clubs started by various cavers affected by the politics of the British Speleological Association i ... who were originally digging the entrance and the North Wales Caving Club who actually broke through one day while the diggers were away. Different sides of the story are available. The following account from the Northern Penni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
