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cretaquarium.gr

The new unique virtual reality experience in the specially designed hall of the Cretaquarium is a fact! Dive into the miracle and the magic of the sea, facing some of the largest and most exciting marine life/organisms of the ocean. Dare to come face to face with a 24-meter whale while she is staring at… Continue reading Virtual Reality at CRETAquarium!

mar.aegean.gr

the department of marine sciences offers a stimulating academic environment for bachelor, masters, and ph.d. specialization degrees in oceanography

maritime-forum.ec.europa.eu

Themes

nhess.copernicus.org

Abstract. Debris flows transport large quantities of water and granular material, such as sediment and wood, and this mixture can have devastating effects on life and infrastructure. The proportion of large woody debris (LWD) incorporated into debris flows can be enhanced in forested areas recently burned by wildfire because wood recruitment into channels accelerates in burned forests. In this study, using four small watersheds in the Gila National Forest, New Mexico, which burned in the 2020 Tadpole Fire, we explored new approaches to estimate debris flow velocity based on LWD characteristics and the role of LWD in debris flow volume retention. To understand debris flow volume model predictions, we examined two models for debris flow volume estimation: (1) the current volume prediction model used in US Geological Survey debris flow hazard assessments and (2) a regional model developed to predict the sediment yield associated with debris-laden flows. We found that the regional model better matched the magnitude of the observed sediment at the terminal fan, indicating the utility of regionally calibrated parameters for debris flow volume prediction. However, large wood created sediment storage upstream from the terminal fan, and this volume was of the same magnitude as the total debris flow volume stored at the terminal fans. Using field and lidar data we found that sediment retention by LWD is largely controlled by channel reach slope and a ratio of LWD length to channel width between 0.25 and 1. Finally, we demonstrated a method for estimating debris flow velocity based on estimates of the critical velocity required to break wood, which can be used in future field studies to estimate minimum debris flow velocity values.

jpl.nasa.gov

Robotic Space Exploration - www.jpl.nasa.gov

ecmwf.int

National meteorological and Hydrological Services (NMHS) of ECMWF Member and Co-operating States and their authorised users, are granted full access to ECMWF products and services via their computing representative. For other users, please see the the Service Agreements & Use Cases page, to see if fees apply to you.

dlr.de

Das Deutsche Zentrum für Luft- und Raumfahrt (DLR) ist das Forschungszentrum der Bundesrepublik Deutschland für Luft- und Raumfahrt. Seine Forschungs- und Entwicklungsarbeiten in Luftfahrt, Raumfahrt, Energie, Verkehr und Sicherheit sind in nationale und internationale Kooperationen eingebunden.