نتایج جستجو برای: river terraces
تعداد نتایج: 84887 فیلتر نتایج به سال:
Agricultural terraces are features that provide a number of ecosystem services. As a result, their maintenance is supported by measures established by the European Common Agricultural Policy (CAP). In the framework of CAP implementation and monitoring, there is a current and future need for the development of robust, repeatable and cost-effective methodologies for the automatic identification a...
In phylogenomic analysis the collection of trees with identical score (maximum likelihood or parsimony score) may hamper tree search algorithms. Such collections are coined phylogenetic terraces. For sparse supermatrices with a lot of missing data, the number of terraces and the number of trees on the terraces can be very large. If terraces are not taken into account, a lot of computation time ...
A late-Holocene vegetation record is presented from the southwest coast of New Caledonia. Lac Saint Louis is a freshwater swamp at 3m a.s.l. adjacent to the River Coulee delta. Pollen analysis, charcoal analysis, radiocarbon dating and stratigraphic analyses have been used to reconstruct the vegetation and sedimentary history of the swamp. The sediment record commences at 6000 BP and reflects r...
River terraces are geomorphological markers recording deformation. Here, we use four strath and fill river along the Kızılırmak in Turkey to unravel deformation convex arc formed by central North Anatolian Fault (NAF), a continental transform fault. 10Be, 26Al, 36Cl cosmogenic exposure ages of T3 T2 constrain their formation at 83 ± 15 ka 67 7 ka, respectively. We evidence frost-cracking during...
Terrace profiles along rivers based on accurate correlations of terraces and geochronological examination are needed to reveal regional crustal deformation from the distribution river terrace surfaces. Tephra beds, which intercalated or cover sediments, used as beneficial information correlate surfaces accurately. On other hand, in cases lacking tephric correlation is mainly geomorphic characte...
Many bedrock canyons on Earth and Mars were eroded by upstream propagating headwalls, and a prominent goal in geomorphology and planetary science is to determine formation processes from canyon morphology. A diagnostic link between process and form remains highly controversial, however, and field investigations that isolate controls on canyon morphology are needed. Here we investigate the origi...
This paper describes the hitherto unreported occurrence of mid-Holocene mangrove deposits in the Richmond River estuary, southeastern Australia, thereby providing evidence for changes in the distribution and composition of mangrove communities within a subtropical estuarine system during the Holocene. Stratigraphic, radiocarbon and palynological evidence indicates that widespread development of...
Abstract. River erosion affects the carbon cycle and thus climate by exporting terrigenous to seafloor sediment nourishing CO2-consuming marine life. The Yukon River–Bering Sea system preserves rare source-to-sink records of these processes across profound changes in global during past 5 million years (Ma). Here, we expand terrestrial record dating terraces along Charley River, Alaska, explore ...
The characterisation of quartz grains’ chemical and mineralogical properties in sediments sedimentary rocks is widely used provenance studies. This paper analyses grains from the coarse sand fraction soils Quaternary fluvial terraces (Guadalquivir River, southern Spain). tentative soil ages are 0.3 ka (Haplic Fluvisol), 7 Calcisol), 70 (Cutanic Luvisol), 300 (Lixic Calcisol) 600 Luvisol). shed ...
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