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Learned Response-Field Inertia Operator for HEC-RAS 2D Water-Surface Elevation Prediction

arXiv:2606.06385v1 Announce Type: new Abstract: This article presents a cross-dataset evaluation of learned native-cell surrogate models for solver-consistent water-surface elevation (WSE) prediction in HEC-RAS 2D. To avoid raster remapping error and information-access confounding, surrogates are evaluated directly on the original nonuniform computational cells under an explicit policy that separates static project inputs, current hydraulic state, project-input forcing, calibration-derived...

arXiv CS 5d ago

Traveling surface wave propagation on shallow water with variable bathymetry and current

Announce Type: replace Abstract: Energy transmission over long distances by waves is a key mechanism for many natural processes. This possibility arises when an inhomogeneous medium is arranged in such a manner that it enables a certain type of wave to propagate with virtually no reflection or scattering. By application of the Laplace cascade method for integrating second-order hyperbolic equations, a general algorithm for finding the parameters of inhomogeneous non-reflecting flows is proposed.

arXiv Physics 1d ago

Bees can swim and use visual cues to survive water crashes

Bees can swim and use visual cues to survive water crashes Gaby Clark Scientific Editor Robert Egan Associate Editor When a bee crashes into water, it may still be able to swim to safety. New research from Michigan State University confirms that honeybees can propel themselves across the water's surface, and their movement is purposeful and directional. They swim toward darker areas—likely using visual cues to locate the shoreline and escape.

Phys.org 7d ago

SWOT satellite gets clearer ocean data after fix for hidden underwater wave interference

SWOT satellite gets clearer ocean data after fix for hidden underwater wave interference Sadie Harley Scientific Editor Robert Egan Associate Editor Florida State University research published in Science Advances demonstrates a new framework for predicting the motion of kilometer-scale underwater waves that complicate satellite readings of the ocean. By accurately modeling these subsurface waves, scientists can remove their interference from NASA's Surface Water and Ocean Topography, or...

Phys.org 6d ago

This prehistoric fish may explain how animals first walked on Earth

Scientists have peered inside the skull of a 380-million-year-old Antarctic fish that was closely related to the first animals to walk on land, revealing surprising clues about how life began its move out of the water. Using advanced neutron imaging, researchers discovered that Koharalepis jarviki had features suited for living near the water’s surface, including openings in its skull that may have helped it gulp air and a light-sensitive organ linked to day-night rhythms.

Science Daily 16d ago

Hydrodynamically engineered Indigenous arrows skip on water for waterfowl hunting

Announce Type: new Abstract: Across the Northern Hemisphere, Indigenous hunters developed arrows capable of skipping across the water surface to strike waterfowl. Archaeological and ethnographic records reveal remarkably similar projectile designs spanning millennia and geographically distant cultures, suggesting a convergent technological solution.

arXiv Physics 7d ago

Part boat, part plane, part sci-fi: China debuts flying watercraft

Part boat, part plane, part sci-fi: China debuts flying watercraft Chinese company Navee completes the maiden flight of a consumer-focused craft that glides above the water on a cushion of air The Soviet “sea monster” is back – and this time it’s for sale. A Chinese company has completed the maiden flight of a passenger craft that skims just above the water’s surface using ground-effect technology, reviving a concept once associated with the Soviet Union’s giant Cold War-era experimental...

South China Morning Post 6d ago

Scientists lose critical climate record as ocean observatory will go dark under Trump funding cuts

Scientists lose critical climate record as ocean observatory will go dark under Trump funding cuts Andrew Zinin Lead Editor A portion of one of the most ambitious ocean monitoring networks ever built will go dark this month when scientists board a research vessel and motor off the Oregon coast to pull a research buoy from deep out of the Pacific. The buoy 80 meters (260 feet) below the water's surface will be removed June 16 from the Ocean Observatories Initiative—a network of more than 900...

Phys.org 7d ago

Pressure beneath a periodic travelling water-wave in constant-vorticity flow over a flat bed

arXiv:2602.21077v2 Announce Type: replace Abstract: We investigate within the framework of linear theory the behaviour of the total (hydrodynamic) pressure and of the dynamic pressure in a regular wave train which propagates at the surface of water with a flat bed in a flow with constant vorticity. We show that nonzero vorticity, the hallmark of a non-uniform underlying current, may strongly alter the behaviour with respect to the case of irrotational flows, for which the maximum and minimum...

arXiv Physics 7d ago

Geoengineering can thicken Arctic sea ice, but for how long?

Each winter, Canada builds more than 7000 kilometres of ice roads, in part by drilling holes in lake ice and pumping water onto the surface, where it freezes and thickens the ice for massive vehicles, as seen in the TV series Ice Road Truckers. If we did the same thing on top of Arctic sea ice, could we thicken it enough to stop it from disappearing? That’s the question tested by geoengineering researchers in field trials in Canada and Norway in 2024 and 2025.

New Scientist 9d ago