Virtueller Geocache
Piscina naturale / Natural pool / Naturpool

von Mr. & Mrs. Marple     Italien > centro (i) > Siena

N 43° 26.147' E 011° 24.538' (WGS84)

 andere Koordinatensysteme
 Größe: kein Behälter
Status: kann gesucht werden
 Zeitaufwand: 0:20 h   Strecke: 0.4 km
 Versteckt am: 12. September 2016
 Veröffentlicht am: 12. September 2016
 Letzte Änderung: 19. September 2016
 Listing: https://opencaching.de/OC132DA
Auch gelistet auf: geocaching.com 

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Der Weg

Beschreibung    Deutsch  ·  English  ·  Italiano

English version

Natural pool

All over the world you will find natural pools, which could not be more versatile in their forms.

Natural pools arise in a variety of ways:

1) On volcanic islands solidified rocks in wells and formed natural barriers, where sea water accumulates at high tide. Such so-called tidal pools are perfect, swims shelters.Tidepools is his own, that they have no permanent inflow from the open sea (fresh water).

The tide pools that are in the low to mid intertidal are most regularly supplied with fresh water at high tide. The rock pools of the upper eulittoral to the border between the upper supralittoral and terrestrial zone contrast obtained only splash, spray of the surf in storm conditions or by rainfall freshwater.

The location of tidepools causes a progressive dehydration by the sun and wind and the associated increase in salinity in the pool. If the risk of a complete drying is not so big, so but the temperature is at least rise in tide pools in prolonged sun exposure compared to the clear in the open sea.

The most important abiotic environmental influences for rock pools and tidal pools are thus:

• sunlight

• Wind

• Precipitation

• Contacting Freshwater

The latter point is dependent on the level of the pond or pool over the sea (Hum), as well as its distance from the sea. The precipitate is important because by the fresh water of the rain (Sal 0.5 ‰) rock pools or tide pools can be ausgesüßt. Some of the fresh water can result of lower density to form a fairly uniform layer of lower salinity than the denser saltwater.

Bildergebnis für garachico bilder Garachico , Teneriffa

2) Even by erosion form pools: When eating flows through different solid rock layers, waterfalls may occur which rinse again over a very long time water basins. These basins are also called stilling basins. They are a catch basin for the draining water .

A waterfall is a section of a river where the flow due to the formation of the rock underground, at least partly goes into freefall.

In the variety of forms of classical free, vertical crash is more the exception. Mostly there are sliding portions in the drop section, which are often formed by forming pools in stage paragraphs. Depending on the slope of the valley level can it step-like cascade or wide permanent sequences of several waterfalls occur.

With waterfalls, various sections can be distinguished:

• the start of the drop distance: possible transition region to the actual waterfall (see rapids.)

• Head zone: area of ​​the waterfall above the impact zone where the water passes from flowing over the shooting from falling

• case edge: possible clearly defined place in the top zone of the waterfall, where the water from flowing immediately changes the Fallen

• Case zone: area of ​​the waterfall between the head and the impact zone where the water either free, cascaded or Gunning (sliding) falls

• Impact zone: area of ​​the waterfall below the fall zone, where the falling, shooting or atomized water impacts and back to a water collects (characteristics: wetness or high moisture, limited vegetation)

• Gumpe: most existing stilling basin in the impact zone of the waterfall with strong vertical erosion

• Discharge of the drop distance - the possible transition region to the normal stream, rapids like with scouring.

Origin and types:

Generally a flowing water has a tendency to weaken by retrogressive erosion and its towing cargo (transportation of sand, gravel, etc.) slope breaks and form a balanced longitudinal profile. This trend is contrary to the formation of waterfalls, so as to form and receive case levels only in particular circumstances. There appear to be two main types of case levels differ with subgroups:

Drop steps that are self-limited or substantially through the flow dynamics of the water with due

Examples of destructive erosion processes, forming waterfalls

• Waterfalls form particularly often where under resistant rock slightly removable rock follows. On crossing the water in the area where the softer rock crosses out, arises from an initial pitting a par with Gumpe and finally the undermining of the harder rock. About this cavity breaks with the time after the rock. The location of the waterfall moves by upstream over time. This molding process is called also "retrogressive erosion".


Why a waterfall due to cratering walk backwards.

• In almost homogeneous rock, such as granite or porphyry can form shapely cascade stairs from potholes on stage with pools.

Examples of constructive, by mineral precipitation to form waterfalls

• waterfalls that build up through carbonate precipitation at first small gradient levels (local pressure drop at the case edge) gradually. The terrace edges of travertine (tufa also called) can reach up to 100 m in height, particularly abundant in karst areas.

Drop steps that are already given without significant intervention of the watercourse

Examples of reinforcing itself or regenerating drop steps:

• waterfalls, cascading over terrain stages active faults. For this one can also include potholes, pour down the crevasses.

• waterfalls that cascade down cliffs into the sea surf

• Waterfalls of tributary streams that can not follow the increased vertical erosion of the receiving water and thus hurl an orifice stage

• Waterfalls of tributary streams that flow through the baffle slopes of receiving waters and therefore hurl an orifice stage

Bildergebnis für garachico bilder Katalonien

3) A special form of natural pools are the cenotes, where underground rivers exist that are exposed by collapses of the upper cavity portion. Some of these cenotes can be found hardly accessible in the jungle, while others have been converted into a kind of public swimming pools. Underwater then can admire stalagmites, formed over thousands of years.

They have an average depth of about 15 meters , separated by about 100 meters .

Bildergebnis für cenotes bilder Cenotes - Cancun

Questions for the log permission:

1 ) What is the nature of the formation here ? Describe in your own words, why have here even formed several pools .

2 ) Is this a constructive or destructive formation ?

3 ) What is receding erosion ?

4 ) Determine the height of the case zones .

5 ) Give the average diameter of all pools .

6 ) Estimate the depth of the pools . Assuming that a basin annually deepens 1mm, how long did it take to reach the estimated depth ?

7 ) Optional: Photo without hints


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