نتایج جستجو برای: fluvial environment

تعداد نتایج: 521898  

2018
Hiroaki Ikeuchi Yukiko Hirabayashi Dai Yamazaki Sanne Muis Philip J. Ward Hessel C. Winsemius Martin Verlaan Shinjiro Kanae

Water-related disasters, such as fluvial floods and cyclonic storm surges, are a major concern in the world’s mega-delta regions. Furthermore, the simultaneous occurrence of extreme discharges from rivers and storm surges could exacerbate flood risk, compared to when they occur separately. Hence, it is of great importance to assess the compound risks of fluvial and coastal floods at a large sca...

Journal: :Applied sciences 2022

Though microplastic (MP/MiP) pollution of the environment is a popular research topic, relatively limited number studies are investigating its geomorphological context. However, site-specific hydrological and morphological parameters fundamentally affect MP transport, deposition mobilization. Therefore, we aimed to evaluate influencing factors on in fluvial sediments Tisza River (Central Europe...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Stefanie Widder Katharina Besemer Gabriel A Singer Serena Ceola Enrico Bertuzzo Christopher Quince William T Sloan Andrea Rinaldo Tom J Battin

Recent studies highlight linkages among the architecture of ecological networks, their persistence facing environmental disturbance, and the related patterns of biodiversity. A hitherto unresolved question is whether the structure of the landscape inhabited by organisms leaves an imprint on their ecological networks. We analyzed, based on pyrosequencing profiling of the biofilm communities in 1...

2002
G. E. Tucker K. X. Whipple

[1] Mechanistic theories of fluvial erosion are essential for quantifying large-scale orogenic denudation. We examine the topographic implications of two leading classes of river erosion model, detachment-limited and transport-limited, in order to identify diagnostic and testable differences between them. Several formulations predict distinctly different longitudinal profile shapes, which are s...

2010
WILLIAM N. GALLIN CARI L. JOHNSON

Understanding how changes in fluvial and marginal marine architecture correlate with shifts in marine shoreface architecture is a crucial step to understanding the effect of relative sea level changes on terrestrial sedimentary systems. Three measured sections (each >230 m), 2367 paleocurrent measurements, and examinations of lateral facies relationships were made over 3 km of continuous outcro...

2012
J. H. Nienhuis A. D. Ashton P. C. Roos L. Giosan

This study focuses on the effects of changes in fluvial sediment supply on the plan-form shape of wave-dominated deltas. We apply a one-line numerical shoreline model to calculate shoreline evolution after (I) elimination and (II) time-periodic variation of fluvial input. Model results suggest four characteristic modes of wave-dominated delta development after abandonment. The abandonment mode ...

Journal: :Remote Sensing 2013
Ninni Saarinen Mikko Vastaranta Matti Vaaja Eliisa Lotsari Anttoni Jaakkola Antero Kukko Harri Kaartinen Markus Holopainen Hannu Hyyppä Petteri Alho

Vegetation plays an important role in stabilizing the soil and decreasing fluvial erosion. In certain cases, vegetation increases the accumulation of fine sediments. Efficient and accurate methods are required for mapping and monitoring changes in the fluvial environment. Here, we develop an area-based approach for mapping and monitoring the vegetation structure along a river channel. First, a ...

2003
Ted A. Maxwell

Introduction: Since Mariner 9 first imaged fluvial channels on the surface of Mars thirty years ago, one of the continuing problems of its hydrologic history has been the apparent absence of small, first-order tributaries to the large outflow channels and the larger integrated channels of the highlands [1]. Drawing on terrestrial examples from the northeast Sahara, where Quaternary climate has ...

2017
Martin Thoms

Keynote Session 1 Title: The ecohydrology of river vegetation Organizer: Dr. Matthew O’Hare (CEH Edinburgh, Bush estate, Penicuik, EH26 0QB, UK Synopsis: This session will focus on the developing field of riverine plant ecohydrology. Riverine plants including both aquatic macrophytes and riparian vegetation respond to their physical environment but they also influence it, effecting both hydrolo...

2003
K. A. Milam H. Y. McSween J. E. Moersch

Introduction: The unifying theme of the Mars Exploration Program is the search for evidence of past or present liquid water [1]. The underlying assumption behind this is that areas on Mars exposed to liquid water would have had the highest probability of capturing and preserving biomarkers. As a part of this program strategy, two Mars Exploration Rovers (MERs) will launch toward Mars in 2003, w...

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