نتایج جستجو برای: river beds
تعداد نتایج: 97771 فیلتر نتایج به سال:
Abstract. Grain size analysis is the key to understand sediment dynamics of river systems. We propose GRAINet, a data-driven approach analyze grain distributions entire gravel bars based on georeferenced UAV images. A convolutional neural network trained regress as well characteristic mean diameter from raw GRAINet allows for holistic bars, resulting in (i) high-resolution estimates and maps sp...
Extensive horizons of pyritic shale occur in Mid-Proterozoic sediments of the eastern Belt basin, Montana, U.S.A. These pyritic shales are of striped appearance. Laminated pyrite beds alternate with non-pyritic shale beds. Laminated pyrite beds have wavy-crinkly internal laminae and are interpreted as mineralized microbial mats. Pyrite is essentially the only sulfide mineral in these shales. Py...
This study aims to identify favorable oil–gas reservoir facies in the Chishan group of the Wubao fault zone (Gaoyou sag, Subei basin, China) using the methods of outcrops and cores observation, granularity analysis, scanning electron microscope, log data, etc. The results suggest that the Chishan group in the studied area mainly develops desert sedimentary system, and contains five kinds of fac...
The Northwest Power Planning Council (Council) requested the Independent Scientific Advisory Board (ISAB) to undertake a review of the impacts of estuarine conditions on the Council's mission to " protect, mitigate and enhance " fish and wildlife in the Columbia River as affected by development and operation of the hydroelectric system. The ISAB agreed to undertake the review but cautioned that...
One special focus of ESAs ERS ENVISAT Tandem (EET) Campaigns were high northern latitudes. Considering the good potential of EET Crossinterferometry (CInSAR) for DEM generation over relatively flat areas, one objective was to fill the gap in the SRTM DEM coverage at latitudes above 60 deg. North. To address this topic, develop methodologies, and asses potential and limitations we investigated s...
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