نتایج جستجو برای: lithologic control
تعداد نتایج: 1329472 فیلتر نتایج به سال:
[1] Current models of long-term river incision into bedrock suggest that the local rate of differential rock uplift should exert a primary control on the gradient of channel longitudinal profiles. However, discrimination of this effect from the influence of variations in substrate erodibility, sediment flux, precipitation, and transient changes in profile shape has proved difficult in practice....
Heterogeneous hydrologic, lithologic, and geologic basal boundary conditions can exert strong control on the evolution, stability, and sea level contribution of marine ice sheets. Geothermal flux is one of the most dynamically critical ice sheet boundary conditions but is extremely difficult to constrain at the scale required to understand and predict the behavior of rapidly changing glaciers. ...
Rock mass strength is recognized as an important control on landscape morphology and evolution. However, the controls rock in mountainous topography remain poorly characterized, part because remains challenging to quantify at spatial scales relevant geomorphology. Here we mechanical properties of masses using subsurface S-wave velocities, Schmidt hammer hardness values, Geological Strength Inde...
Abstract Recent acquisition of high‐resolution satellite imagery the Martian surface has permitted landslides to be studied on a global scale Mars for first time. We apply Scoops3D software package compute slope stability select regions surface, combining calculations with number observed (Crosta, Frattini, et al., 2018; Crosta, De Blasio, 2018), as reported in recently published inventory land...
A large data base consisting of 40,679 well locations and 196,687 lithologic records was created from Illinois, Indiana, and Wisconsin well construction records for wells drilled during the period 1980-1997. The purpose of the database is to provide information for mapping the surface, thickness, transmissivity and hydraulic conductivity of the Quaternary, Silurian/Devonian, and Cambrian/Ordovi...
Site U1317 (proposal Site PORC-3A) is located on the northwest shoulder of the Challenger Mound (51o 22.8 N, 11o 43.1W, in 781 to 815 m water depth). Scientific drilling of the Challenger Mound was the central objective of Expedition 307. Specific objectives of drilling Site U1317 were: • To establish whether the mound base is on a carbonate hardground of microbial origin and whether past geofl...
The Gorkha earthquake (magnitude 7.8) on 25 April 2015 and later aftershocks struck South Asia, killing ~9000 people and damaging a large region. Supported by a large campaign of responsive satellite data acquisitions over the earthquake disaster zone, our team undertook a satellite image survey of the earthquakes' induced geohazards in Nepal and China and an assessment of the geomorphic, tecto...
Lithologic, faunal, seismic, and isotopic evidence from the Blake Nose (subtropical western North Atlantic) links a massive release of biogenic methane approximately 55.5 million years ago to a warming of deep-ocean and high-latitude surface waters, a large perturbation in the combined ocean-atmosphere carbon cycle (the largest of the past 90 million years), a mass extinction event in benthic f...
The nomenclature for Kansas aquifers needs revision. Many of the names currently in use were derived in an ad hoc manner without the benefit of a consistent set of hydrogeologically based guidelines. Because nomenclature forms the basis of scientific discussion of hydrologic issues, names should be clearly defined and consistently applied in order to prevent erroneous or unintended hydrologic i...
Recognition that channel form reflects a river's ability to erode rock has spawned stream-power models that estimate patterns of incision by approximating energy dissipation within a channel. Most commonly, these models assume channel width exponentially scales with drainage area, in part, because drainage area is easily extracted from digital elevation models (DEMs). However, this assumption i...
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