Abstract Sediment gravity flows are the most direct and efficient transport mechanisms for moving terrestrial sediments into deep oceans. Scarcity of firsthand measurements, however, has hindered quantitative, even qualitative characterization such flows. Here we present a unique year-long data record from ~4000 m depth in Manila Trench that captured two very different terms their hydraulic sed...

It can be shown from bedform stability diagrams, that each turbidity current, regardless of whether its density is low or high, or whether its history is simple (e.g., surging flow) or complex (e.g., sustained flow), should pass through a final waning phase in which flow conditions are prone to bedform development. Yet, many thick deep-marine sandstones of supposed turbidity-current origin are ...

The development and testing of a “turbidity” model is documented for a water supply reservoir, Schoharie Reservoir, NY, where inorganic terrigenous particles received during runoff events in turbid density currents from the primary tributary cause distinct periodic degradation. The model state variables are fractions two or three of the beam attenuation coefficient at 660 nm c660 , a surrogate ...

The seasonal concentrations of dissolved oxygen in a subtropical deep reservoir were studied over a period of one year. The study site was the Feitsui Reservoir in Taiwan. It is a dam-constructed reservoir with a surface area of 10.24 km(2) and a mean depth of 39.6 m, with a maximum depth of 113.5 m near the dam. It was found that certain weather and climate events, such as typhoons in summer a...

Turbidity currents generated nearshore have been suggested to be the source of some sandy marine event beds, but in most cases the evidence is circumstantial. Such flows must commonly travel through a field of oscillatory flow caused by wind-generated waves; little is known, however, about the interactions between waves and turbidity currents. We explore these interactions through detailed proc...

Methane ebullition (bubbling) from lake sediments is an important methane flux into the atmosphere. Previous studies have focused on open-water season, showing that temperature variations, pressure fluctuations, and wind-induced currents can affect ebullition. However, surveys during ice-cover are rare despite prevalence of seasonally ice-covered lakes, factors controlling poorly understood. He...