Suprapermafrost groundwater seepage in gravelly terrain, resolute, NWT, Canada

摘要: Gravel terrain in the polar desert region of Arctic Canada supports many features such as saturated zones, wetlands, ponds and streams, all which are associated with local seepage suprapermafrost groundwater. Gravels have high specific yield large hydraulic conductivity to facilitate water flow, but a shallow frost table prevents deep percolation so that, given adequate supply from snowmelt or rainfall, will occur where topographic surface intersects table. Such can be seen on concave slopes produce zones. Where is focused, small streams maintained. Water balance computation for wetland pond shows that their upslope gravel zones major source. Continual alters soil, vegetation moisture characteristics site, resulting thermal hydrological feedbacks perpetuate various discussed. Le graveleux des regions de polaire l'Arctique canadien montrent saturees, terres humides, mares et ruisseaux qui sont associes avec suintements d'eau venue la partie superieure du pergelisol. Les graviers ont une teneur en eau elevee grande conductivite hydraulique facilite l'ecoulement l'eau; comme gelee est faible profondeur, elle empěche toute profonde se produisent ou topographique recoupe nappe aquifere. Lorsque tels ecoulements localises sur pentes concaves, ils forment localement saturees. Quand les concentres, petits cours deviennent permanents. calculs l'eau realises pour zone humide mare que venu situee contre-haut le versant premiere source d'eau. continus alterent sol, caracteristiques d'humidite sites affectes. consequences thermiques hydrologiques qu'induisent ces entraǐnent conservation divers phenomenes discutes.