We analyzed the abundance and distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in grain size fractions of 7 globally distributed river flank sediments and catchment soils in order to determine if and how the initial soil-brGDGT signature is influenced by hydrodynamic sorting upon entering a river and during subsequent transport from land to sea. BrGDGTs are hypothesized ...

Examining the patterns of archaeal diversity in little-explored organic-lean marine subsurface sediments presents an opportunity to study the association of phylogenetic affiliation and habitat preference in uncultured marine Archaea. Here we have compiled and re-analyzed published archaeal 16S rRNA clone library datasets across a spectrum of sediment trophic states characterized by a wide rang...

The Hanjiang River is the second-largest river in Guangdong Province, China. modern sedimentation pattern of subaqueous delta has been significantly affected by changes sediment delivered River. Based on multiperiod charts and columnar samples from delta, influence a sharp decrease flux deposition past 60 years was studied through combination chart-based analysis evolution erosion samples. resu...

Fine grained sedimentary rocks, both clastic and carbonate, are believed to be the most abundant rock type on the Earth‟s surface (Picard, 1971; Blatt, 1982). Fine grained rocks appear to constitute somewhere in the region of 70% (Holmes, 1937) and 80% (Clarke, 1924) of all the sediment ever produced. In sedimentology the size grade scale most commonly used is that which was introduced by Udden...

Near-surface seafloor properties affect offshore mining and infrastructure engineering. Shallow sediments experience extremely low effective stress, consequently, these exhibit very in-situ density, shear wave velocity, stiffness. We combined data extracted from the literature with new laboratory field results to develop a comprehensive understanding of shallow sediments. First, we explored sed...

Fine-grained sediments are Quaternary with grain sizes of not more than 2 mm. They start first when meeting water, their stability is related to the initial water volume triggering debris flow, and thus plays an important role in flow hazards early warning. The permeability coefficient inter-controlled factor fine-grained sediment stability. However, there no hyperspectral model for detecting l...

First posted March 3, 2022 For additional information, contact: Director, Integrated Modeling and Prediction DivisionWater Mission AreaU.S. Geological Survey12201 Sunrise Valley Dr., MS 411Reston, VA 20192-0002Contact Pubs Warehouse This report describes the skeletal storage, compaction subsidence (CSUB) package of MODFLOW 6. The CSUB simulates vertical compressible sediments land subsidence. g...