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EarthCache

Le dune / The Dune / Die Düne

A cache by kiaw ³³ Send Message to Owner Message this owner
Hidden : 10/26/2014
Difficulty:
1.5 out of 5
Terrain:
3.5 out of 5

Size: Size: other (other)

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Geocache Description:




 

Le dune sorgono a causa della interazione tra la sabbia, la velocità del vento e la copertura vegetale. L'espressione di questi fattori di processo determinano la Classificazione delle stesse.

>var>Sul lato di sopravvento e piatta la sabbia viene forzata attraverso il pendio. Si tratta di un ordinamento di granulometria di solito a forma di pettine,prende la dimensione del grano. Dalla cresta della duna cade la sabbia sul lato sottovento. L' inclinazione delle dune corrisponde all'angolo di attrito interno alla sabbia rinfusa , che è di circa 30 °. In genere la duna cresce quanto e` maggiore il volume di sabbia.

Le dune si verificano sulla terra nei deserti e sulle coste. Questi differiscono principalmente dalle diverse condizioni di trasporto della sabbia sul terreno. Nel deserto è secca. La sabbia può essere trasportato dal vento e può avvenire lo scambio di sabbia tra le dune. Sulle coste tuttavia è generalmente umido, e la vegetazione presente, in modo che il trasporto di sabbia è ostacolato.

var>La sabbia è naturalmente un sedimento consolidato, composto da singoli grani minerali. E`diversa dal limo e più sottile della ghiaia, la stessa e`anche uno dei terreni non coesivi.

L'indicazione della granulometria di un componente di roccia, che varia tra 0,063 millimetri e 2 mm o 4 mm a -1 Phi è chiamato diametro dei i grani.

Sabbia è suddivisa come segue:

fine ( ,063-0,2 mm )

media ( 0,02-0,63 mm)

grossa( ,063-2 mm)

Ci sono tre gruppi principali di tipi di suolo.

1) la sabbia pulita

2) terriccio Sabbia

3) Limo

Tuttavia, ci sono ancora altri confini di classe e nomi

Ora per le domande

1) Forma preferita delle dune?

2) Che tipo di una specie di dune di sabbia si parla nelle coordinate di intestazione ? Definire anche il motivo?

3) Ci sono tre gruppi principali di sabbia - dare qui almeno 3 tipi diversi della sabbia e spega con parole tue il motivo per cui questa sono appena inondati. I grani sono ancora non cementati tra loro in un rapporto sciolto e gli spazi dei pori riempiti con acqua.

Pesempio: sabbie - chiamato anche sabbia galleggiante , è una sospensione di sabbia e acqua; Sabbie mobili può verificarsi solo se i granelli di sabbia erano appena inondati o riarrangiati, i grani sono ancora non cementate tra loro in un rapporto sciolto e gli spazi dei pori riempire con acqua facilmente.

4) Vai alle coordinate e mi scrivi. Questa e altezza della duna.

5) Una foto di voi o il vostro GPS al Headerkoords è opttimo

Inviatemi le vostre risposte attraverso il mio  GC Profil via Messenger - NON E-Mails! Poi si può accedere subito. È necessario il permesso di accesso. Se le risposte non sono corrette mi faccio sentire. Registri senza elettronica saranno cancellati!

Buona giornata e buon divertimento.

 

kiaw³³ wink

 



 

Dunes are create by the supply of sand, wind and lack of vegetation. The combination of these factors is responsible for the type of dunes created.

On the shallow side facing the wind, sand is blown up the dunes. During this process there is a selection of the grain size. Up to the top the grain size gets smaller. From the top ridge the sand drops down the down wind side of the dune. There the sand gets deposited at an angle of about 30°. Generally dunes grow with the addition of more sand. The higher the dunes the more sand they contain.

Dunes exist everywhere on the planet, in the desserts as well as in the coast areas. . They differ by the different ways of transport of the sand. Dessert dunes usually contain very dry sand that moves freely between the dunes while coastal dunes are usually anchored dorn by vegetation.

Dunes exist everywhere on the planet, in the desserts as well as in the coast areas. . They differ by the different ways of transport of the sand. Dessert dunes usually contain very dry sand that moves freely between the dunes while coastal dunes are usually anchored dorn by vegetation.

In physical geography, a dune is a hill of sand built by either wind or water flow. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as ergs.

Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach. In most cases, the dunes are important in protecting the land against potential ravages by storm waves from the sea. Although the most widely distributed dunes are those associated with coastal regions, the largest complexes of dunes are found inland in dry regions and associated with ancient lake or sea beds. Dunes can form under the action of water flow (fluvial processes), and on sand or gravel beds of rivers, estuaries and the sea-bed.

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e. a soil containing more than 85% sand-sized particles

Generally sands grades are fine, medium and coarse with ranges 0.063 mm to 0.2 mm to 0.63 mm to 2.0 mm.

The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO2), usually in the form of quartz, which, because of its chemical inertness and considerable hardness, is the most common mineral resistant to weathering.

The composition of mineral sand is highly variable, depending on the local rock sources and conditions. The bright white sands found in tropical and subtropical coastal settings are eroded limestone and may contain coral and shell fragments in addition to other organic or organically derived fragmental material, suggesting sand formation depends on living organisms, too. The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color. Arkose is a sand or sandstone with considerable feldspar content, derived from weathering and erosion of a (usually nearby) granitic rock outcrop. Some sands contain magnetite, chlorite, glauconite or gypsum. Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts and obsidian. Chlorite-glauconite bearing sands are typically green in color, as are sands derived from basaltic (lava) with a high olivine content. Many sands, especially those found extensively in Southern Europe, have iron impurities within the quartz crystals of the sand, giving a deep yellow color. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.

Quelle: wikipedia.org

The questions:

1. Where are dunes formed normally?

2. What kind of sand can be seen at the header coordinates?

3. There are 3 main categories of sand. Name at least 3 different classifications and explain them briefly.

E.g.: Quicksand: is a colloid hydrogel consisting of fine granular material (such as sand or silt), clay, and water. Quicksand forms in saturated loose sand when the sand is suddenly agitated. When water in the sand cannot escape, it creates a liquefied soil that loses strength and cannot support weight.

4. Check the height of the dune at the header cords with your GPS and mail me the answer.

5. Optionally you can attach a pic of you and/or your GPS.

 

You can me send the answers to my GC Profil via Messenger - NO E-Mails! Afterwards you can log the cache immediately. I will check the answers and contact you if they are wrong. Logs without mail will be deleted.

Have an nice day and enjoy the island

kiaw³³ wink

 

 



 

Dünen entstehen aufgrund des Zusammenwirkens von Sandzufuhr, Windstärke und Vegetationsbedeckung. Die Ausprägung dieser Prozessfaktoren bestimmt auch, welcher Dünentyp entsteht (Dünenklassifikation).

Auf der windzugewandten Seite, der flachen Luvseite, wird der Sand durch Saltation den Dünenhang hinaufgetrieben. Hierbei findet eine Korngrößensortierung statt. Zum Kamm hin nimmt in der Regel die Korngröße ab. Vom Dünenkamm fällt der Sand über die windabgewandte Seite, den steilen Leehang, hinunter. Die Neigung des Leehanges entspricht dem Winkel der inneren Reibung für lose geschütteten Sand, also ungefähr 30°. Im Allgemeinen wächst die Düne um so höher, je größer das Sandvolumen einer Düne ist.

Dünen entstehen aufgrund des Zusammenwirkens von Sandzufuhr, Windstärke und Vegetationsbedeckung. Die Ausprägung dieser Prozessfaktoren bestimmt auch, welcher Dünentyp entsteht (Dünenklassifikation).

Dünen entstehen auf der Erde in Wüsten und an Küsten. Diese unterscheiden sich vor allem durch die unterschiedlichen Transportbedingungen für Sand am Boden. In der Wüste ist es trocken, so dass der Sand durch den Wind transportiert werden kann und ein Sandaustausch zwischen den Dünen stattfinden kann. An den Küsten hingegen ist es meistens feucht und Vegetation vorhanden, so dass der Sandtransport behindert wird.

Sand ist ein natürlich vorkommendes, unverfestigtes Sediment, das sich aus einzelnen Mineralkörnern zusammensetzt. Sand ist also gröber als Schluff und feiner als Kies. Sand zählt außerdem zu den nicht bindigen Böden.

Die Angabe zur Korngröße einer Gesteinskomponente, die zwischen 0,063 mm und 2 mm oder 4 mm bis –1 Phi variiert nennt man Korndurchmesser.

Sand wird folgend unterteilt:

1.) Feinsand (0,063-0,2 mm)

2.) Mittelsand (0,02-0,63 mm)

3.) Grobsand (0,063-2 mm)

Es werden drei Hauptgruppe der Bodenarten bzw. Bodenartgruppen unterschieden :

1.) Reinsand

2.) Lehmsand

3.) Schluffsand

Es gibt jedoch noch andere Klassengrenzen und Bezeichnungen.

Quelle: wikipedia.org

Nun zu den Fragen:

1. Wo bilden sich Dünen bevorzugt?

2. Es gibt drei Hauptgruppen von Sand - gib hier mindestens 3 verschiedene andere Klassengrenzen von Sand an und erkäre mit eigenen Worten warum dieser Sand so bezeichnet wird?

z.B.: Treibsand – auch Schwimmsand genannt, ist eine Suspension aus Sand und Wasser; Treibsand kann nur auftreten, wenn die Sandkörner frisch aufgeschüttet oder umgelagert wurden, die Körner noch unverkittet in loser Beziehung zueinander stehen und sich die Porenräume leicht mit Wasser füllen.

3. Von was für einer Art Sand spricht man bei Dünen an den Header Koordinaten? Definiere auch warum?

4. Begib dich zu den Header Koordinaten und schreib mir, wie hoch du dich lt. deinem Navigationsgerät befindest. Das ist die Höhe der Düne

5. Ein Foto von dir oder deinem GPS an den Headerkoords ist optional

 

Sendet mir eure Antworten über mein GC Profil via Messenger - KEINE E-Mails!
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Einen schönen Tag und viel Spaß auf der Insel wünscht euch

kiaw³³ wink

 

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Last Updated: on 7/9/2018 12:16:10 PM Pacific Daylight Time (7:16 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

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