نتایج جستجو برای: fluvial sedimentation
تعداد نتایج: 22091 فیلتر نتایج به سال:
We present the geological map of north-eastern margin Fucino Basin, which is mainly characterized by Plio-Quaternary continental deposits that show transition from deeper-water lacustrine environment, marginal system, and fluvial facies. These unconformably overlie upper Messinian Lago-Mare sediments pre-orogenic carbonate succession. The occurrence Caspiocypris tiberina in sediments, coupled w...
Introduction: Martian paleolakes have been offered as landing sites for in situ and sample-return missions because of their high probability of containing climatic and hydrologic records and potential biomarkers. Prospective paleolake sites are identified in closed craters primarily based on discrepancies between the craters' expected and measured depths and interpretation of associated fluvial...
Starting from traditional ideas on the climatic steering of fluvial system dynamics, it appears that there are different kinds of climatic influences on system dynamics. They vary from direct climatic forcing (like peak precipitation) to indirect (like permafrost) and partial forcing (like vegetation). Vegetation (or its absence), and not directly climate, is considered as the main cause of flu...
The aims of this work are to characterize the paleoenvironmental evolution and sedimentary fluvial responses climate river flow changes upstream reaches Sado estuary since Mid-Late Holocene . By combining previous information, we also intent define limit fluvial-estuarine boundary maximum tidal influence estuarine area during last 4500 years. To accomplish these objectives a 10.5 m-long sedimen...
Estuaries are important sediment facies in the fluvial-to-marine transition zone, strongly controlled by dynamic interactions of tides, waves, and fluvial flows, show various changes depositional processes distribution. Deep investigations on sand component estuaries have been conducted; however, understanding how mud supply affects estuaries’ sedimentary characteristics morphology is still vag...
River-response and Terrace Agradation in the Mediterranean Iberian Peninsula during Historical Times
Mediterranean fluvial environments have responded sensitively to past changes in climate, physiographic conditions and human activity. Chronosequences of river terraces and alluvial deposits were established using morphologic, sedimentological and pedologic criteria, Cand Pb-dating techniques, historical data and pottery fragments. The objective of this study addresses the fluvial dynamic of se...
Abstract The Mekong delta is experiencing rapid environmental change due to anthropogenic activities causing accelerated subsidence, sea-level rise and sediment starvation. Consequentially, the rapidly losing elevation relative sea level. Designating specific areas for sedimentation a suggested strategy encourage elevation-building with nature in deltas. We combined projections of extraction-in...
XBeach is an open source, freely available two-dimensional code, developed to solve hydrodynamic and morphological processes in the coastal environment. In this paper the code is applied to ten different test cases specific to hydraulic problems encountered in the fluvial environment, with the purpose of proving the capability of XBeach in rivers. Results show that the performance of XBeach is ...
River off-take is one of the complex features in fluvial systems and distribution flow, sediments along branches are still a matter research. This paper deals with physical simulation on an channel for understanding flow sediment vicinity. Laboratory-based test runs have been carried out by changing discharges angles off-take. A total eighteen conducted three discharge conditions angles. Two eq...
In the transformation from tidal systems to freshwater coastal landscapes, plants act as eco-engineering species that reduce hydrodynamics and trap sediment, but nature timing of mechanisms land creation along estuaries remains unclear. This article focuses on Old Rhine estuary (The Netherlands) show importance vegetation in landscape evolution, predominantly regarding basin filling overbank mo...
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