Results 31 to 40 of about 1,242 (180)

Early evolutionary history of the seed

Biological Reviews, EarlyView.
ABSTRACT The seed is an essential stage in the life history of gymnospermous and angiospermous plants, facilitating both their survival and dispersal. We reappraise knowledge of the evolutionary history of the gymnospermous seed, from its origin in the late Devonian through to the well‐known end‐Permian extinctions – an interval encompassing the ...
Richard M. Bateman, Alan R. T. Spencer, Jason Hilton   +2 more
wiley   +1 more source

Large-scale landslide dam breach experiments: Overtopping and “overtopping and seepage” failures

Engineering Geology, 2022
Landslide dams form when landslide materials reach rivers causing complete or partial blockage. It is known that overtopping water flows and seepage flows are two crucial processes that induce dam failure. In several instances, the landslide dams collapse is caused by the coupled influence of seepage flows and overtopping water.
Zhou , G., Li, S., Lu , X., Tang, H.
openaire   +3 more sources

Cordilleran Ice Sheet early deglaciation inferred from evolution of Late‐Pleistocene glacial Lake Dzulh Stun in east‐central British Columbia, Canada

Journal of Quaternary Science, EarlyView.
Abstract We document the early decay of the Late‐Pleistocene Cordilleran Ice Sheet in the central portion of the Rocky and Cariboo Mountains and the Rocky Mountain Trench in east‐central British Columbia. Glacial lakes impounded at the eastern margin of the ice sheet occupied watersheds on the west flank of the central Rocky Mountains, leaving ...
Brendan G. N. Miller, John J. Clague, Andrée Blais‐Stevens   +2 more
wiley   +1 more source

Estimation of Wave overtopping on Reshaping Breakwaters [PDF]

محیط زیست و مهندسی آب, 2016
The breakwater as structures that have an important role in the protection of coastal facilities was used to create calm in the harbor, reduce wave energy and also protect the coast against wave attack.
Mahmoud Mohammad Rezapour Tabari, Mohammad Navid Moghim, Razieh Forouzan Boroujeni   +2 more
doaj  

"Two tribes": Handaxe shape variation shows distinct regional cultural groups in southeastern Britain between 424 000 and 374 000 BP

Journal of Quaternary Science, EarlyView.
ABSTRACT This paper examines regional and chronological variations in Acheulean handaxe morphology during Marine Isotope Stage 11 (c. 425–365 ka BP) in Britain. Using a data set of 737 handaxes from 13 securely dated sites in East Anglia and the Thames Valley, we apply three‐dimensional geometric morphometric analysis to examine morphological ...
Mark White, Frederick Foulds, Aaron Rawlinson, Ceri Shipton, Rob Davis, Nick Ashton   +5 more
wiley   +1 more source

Twenty new species of Hieracium sect. Tridentata and H. sect. Foliosa (Asteraceae) from Sweden

Nordic Journal of Botany, EarlyView.
Nineteen new, presumably apomictic species of Hieracium sect. Tridentata, namely Hieracium anisodontum, H. bicoloriceps, H. disparifolium, H. ditrichum, H. erectifolium, H. ferox , H. lapsanae, H. luteoviride, H. megaplicatum, H. multifolium, H. paer‐haraldii, H. perpendiculum, H. phaeochlorum, H. prasiniceps, H. semirigidum, H.
Tommy Nilsson, Torbjörn Tyler
wiley   +1 more source

Study of Overtopping Flow Velocity and Overtopping Layer Thickness on Composite Breakwater under Regular Wave

Journal of Marine Science and Engineering, 2023
Overtopping flow velocity (OFV) and overtopping layer thickness (OTL) are essential parameters in breakwater design. Several empirical equations to predict these parameters are available in many works of literature, but most of the equations were derived
Made Narayana Adibhusana, Jong-In Lee, Young-Taek Kim, Yonguk Ryu   +3 more
doaj   +1 more source

Implications of heterogeneous embankment conditions for geoelectrical investigations on dams: A case study at Mactaquac Dam, Canada

Near Surface Geophysics, EarlyView.
Abstract Electrical resistivity tomography (ERT) has been shown to be effective for surveying and monitoring dams, due to the method's sensitivity to moisture content and relevant physical properties (e.g., porosity). Automated ERT systems, capable of time‐lapse monitoring, can be used to detect variations in ground conditions.
John S. Ball, Karl E. Butler, Jonathan E. Chambers, Paul B. Wilkinson, Andrew Binley   +4 more
wiley   +1 more source

Response of specific leaf area to light: comparative study of a large species set

Oikos, EarlyView.
Specific leaf area (SLA) is a commonly used proxy for the leaf economy spectrum in plants, separating species with low‐cost leaves (in terms of carbon) with short lifespan and hence fast turnover from species with high‐cost and long‐lived leaves. While SLA is used mainly for interspecific comparisons, it also varies within species both ontogenetically ...
Tomáš Herben, Tomáš Koubek, Martin Weiser   +2 more
wiley   +1 more source

Multi‐Sources and Modes‐Based Overtopping Risk Model for Gravity Dams Under Extreme Working Conditions

Water Resources Research
Addressing the limitations of traditional overtopping risk analysis methods, which either consider only a single failure mode or fail to accurately characterize the nonlinear characteristics of reservoir levels, this paper proposes a novel overtopping ...
Liang Pei, Qiliang Sun, Xiang Lu, Yanling Li, Jiankang Chen, Kun He   +5 more
doaj   +1 more source