نتایج جستجو برای: moraine

تعداد نتایج: 549  

Journal: :Water Resources Research 2021

Lateral subsurface stormflow (SSF) is the most important runoff generation mechanism for hillslopes in temperate climates. It influenced by pedological, biological, and topographic factors that change during landscape evolution, but so far little known about how SSF changes over long-time scales. Therefore, we conducted sprinkling experiments on a silicate carbonate moraine chronosequence Swiss...

Journal: :Quaternary Research 2021

Abstract Landforms and sediments on the palaeo–ice stream beds of central Alberta record glacitectonic raft production subsequent progressive disaggregation moulding, associated substrate ploughing, grooving. We identify a subglacial temporal or developmental hierarchy that begins with incipient rafts, including en échelon hill-hole complexes, pairs, strike-slip all which display patterns typic...

Journal: :Journal of Quaternary Science 2023

Abstract We review geochronological data relating to the timing and rate of Laurentide Ice Sheet recession in northeastern United States model ice margin movements a Bayesian framework using compilations previously published organic 14 C ( n = 133) situ cosmogenic 10 Be 95) ages. compare resulting method‐specific chronologies with glacial varve records that serve as independent constraints on p...

Journal: :Frontiers in Earth Science 2021

A singular precipitation event on the summit glacial slopes of Mexico’s highest volcanic peak, Citlatépetl (also known as Pico de Orizaba), associated with passage Hurricane Ernesto across southern Mexico mainland in August 2012, resulted a debris flow at altitudes above 4,400 m asl, culminating hyperconcentrated downstream that had major impacts to river valley’s channel morphology well commun...

2013
Eric S. Klein Robert K. Booth Zicheng Yu Bryan G. Mark Nathan D. Stansell

Peatlands are among the largest reservoirs of terrestrial carbon in the northern hemisphere. Understanding how this reservoir will respond to climate changes is critical to assessing potential climate feedbacks. Peatland carbon accumulation rates (PCAR) are controlled by the difference between production and decomposition, which is affected by local and climatic factors including hydrology and ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم زمین 1388

چکیده ندارد.

Journal: :Quaternary Research 2023

Abstract This study uses luminescence and 14 C accelerator mass spectrometry procedures to date relevant glaciofluvial glacial deposits from the south-central southeastern Pyrenees (Andorra–France–Spain). We distinguish two types of end-moraine complexes: (1) those in which at least a far-flung moraine exists beyond frequently nested complex (the most common) (2) close-nested end encompasses cy...

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