Sundet ved Nørrestrand EarthCache
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For en gletscher er der kun en vej, og det er fremad. Når tilførslen af is hører op eller bliver mindre, smelter isen og bliver til smeltevand. Sten, grus, sand og ler aflejres afhængigt af strømhastigheden. Da Nordøstisen stod med sin rand ved Hovedopholdslinien, strømmede smeltevandet mod vest og opbyggede de vestjyske hedesletter. Efterhånden som isen smeltede tilbage, blev der i de tidligere isdækkede øst- og midtjyske områder åbnet veje for afstrømning i nordlig retning mod Limfjordsområdet. Det var Gudenåsystemet, som blev anlagt. Da Ungbalten lagde sig ved den Østjyske Israndslinie, var Gudenåsystemet stadig afstrømningsvejen, men nu mod Kattegat.
Istidens sidste årtusinder kaldes Senglacialtiden. Isen var smeltet bort fra Danmark, men mange steder lå der endnu dødis tilbage. Landskabet var bart, klimaet vekslede mellem kolde og lune perioder. De kolde perioder kaldes Dryas-tider efter planten Dryas (Rypelyng). Den tundravegetationsom opstod var ikke i stand til helt at beskytte jorden mod erosion.
Tiden efter istiden kaldes postglacialtiden. Den begyndte for 10.000 år siden. Første fase af Postglacialtiden var Fastlandstiden, hvor Danmark var meget større end i dag. Derefter fulgte Stenalderhavet, hvor en pludselig havstigning bragte store dele af Danmark under havdækning. Siden bragte den isostatisk landhævning tidligere havdækkede områder over havniveau. Den isostatiske landhævning er en langsom hævning, som sker på grund af at jorden befries for isens tryk. Samtidig med disse niveauforandringer foregik der en vegetationsudvikling, hvor den ene naturtype afløste den anden. Først indvandrede en lys pionerskov. Den blev afløst af en mørk og tæt skov, som gradvist, via menneskelige indgreb, blev afløst af den kultursteppe vi kender i dag.
I nutidens fjord foregår en stadig vandring og aflejring af materiale. Ved højvande slynger havet sten m.v. mod klinterne. Klinterne undermineres af disse angreb og materiale styrter ned og føres bort. I klinterne bliver landet mindre, til gengæld dannes der nyt land andre steder.
Opgaven her er:
A: Svar på følgende spørgsmål:
1: Hvordan opstod sundet mellem Nørre strand og Horsens fjord?
2: På stedet, hvordan kan du se at der stadigvæk dannes nyt land i Horsens fjord?
3: Du står på en bro, hvilken slags sten er broen lavet af?
B: Send dine svar til f.kaihoj@gmail.com
C: Du må gerne tage et billed og uploade sammen med din log.
Du behøver ikke at vente på svar for at logge cachen, du bliver kontaktet hvis dine svar ikke er rigtige.
English:
In a glacier there is only one way, and it is forward. When the flow of ice ceases or becomes smaller, the ice melts and becomes glacial. Stones, gravel, sand and clay deposited depending on flow rate. Since Northeast ice stood with its rim at the Main Stay Linien meltwater flowed westward and built the Jutland heath plains. As the ice melted back, was in the former glaciated eastern and central Jutland areas opened paths for runoff in a northerly direction towards the Limfjord region. It was the Gudenå system that was instituted. Since Ungbalten lay at the Østjysk line of ice it was still the Gudenå system there was the flow´s path, but now direction to the Kattegat.
Glacial last millennia called Senglacialtiden. The ice had melted away from Denmark, but many places still lay there dead ice left. The landscape was bare, the climate alternated between cold and warm periods. The cold periods are called Dryas times after the plant Dryas (Rypelyng). The tundra vegetation there occurred was not able to completely protect the soil against erosion.
Beyond the Ice Age is called postglacialtiden. It began 10,000 years ago. The first phase was of Postglacialtiden Mainland, The time when Denmark was much larger than today. Then followed the Stone Age Sea, where a sudden rise in sea level brought large parts of Denmark during ocean coverage. Since bringing the isostatic uplift previously ocean coverage areas above sea level. The isostatic uplift is a slow uplift, which happens because of the land freed from the ice pressure. Concomitant with these changes of level there was a vegetation succession, where one habitat replaces another. Only a light immigrant pioneer forest. It was replaced by a dark and dense forest, which gradually, through human intervention, was replaced by the steppe culture we know today.
In today's inlet is a constant migration and deposition of material. At high tide the sea hurls stones etc. against the cliffs. The cliffs eroded by these attacks and material plunges down and carried away. The cliffs are the country less, in turn formed new land elsewhere.
The task here is:
A: Answer the following questions:
1: How occurred the strait between North Beach and Horsens Fjord?
2: On the spot, how can you see there is still formed new land in Horsens Fjord?
3: You are standing on a bridge, what sort of stones are the bridges made off?
B: Send your answers to f.kaihoj @ gmail.com
C: Please take a picture (optional)
You do not have to wait for replies to log the cache, you will be contacted if your answers are incorrect.
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