More Like this

1. YBa $_2$ Cu $_3$ O $_{7-\delta }$ -CeO $_2$ -YBa $_2$ Cu $_3$ O $_{7-\delta }$ Multilayers Grown by Reactive Co-Evaporation on Sapphire Wafers

   https://doi.org/10.1109/TASC.2019.2898778  

   Wang, Yan-Ting ; Semerad, Robert ; McCoy, Stephen J. ; Cai, Han ; LeFebvre, Jay ; Grezdo, Holly ; Cho, Ethan Y. ; Li, Hao ; Cybart, Shane A. ( August 2019 , IEEE Transactions on Applied Superconductivity)
2. Delta channel networks: 2. Metrics of topologic and dynamic complexity for delta comparison, physical inference, and vulnerability assessment: METRICS OF TOPOLOGIC AND DYNAMIC COMPLEXITY FOR DELTAS

   https://doi.org/10.1002/2014WR016604  

   Tejedor, Alejandro ; Longjas, Anthony ; Zaliapin, Ilya ; Foufoula-Georgiou, Efi ( June 2015 , Water Resources Research)
3. Delta channel networks: 1. A graph-theoretic approach for studying connectivity and steady state transport on deltaic surfaces: Graph-theoretic approach for delta channel networks

   https://doi.org/10.1002/2014WR016577  

   Tejedor, Alejandro ; Longjas, Anthony ; Zaliapin, Ilya ; Foufoula-Georgiou, Efi ( June 2015 , Water Resources Research)
4. A global delta dataset and the environmental variables that predict delta formation on marine coastlines

   https://doi.org/10.5194/esurf-7-773-2019  

   Caldwell, Rebecca L. ; Edmonds, Douglas A. ; Baumgardner, Sarah ; Paola, Chris ; Roy, Samapriya ; Nienhuis, Jaap H. ( January 2019 , Earth Surface Dynamics)

   Abstract. River deltas are sites of sediment accumulation along thecoastline that form critical biological habitats, host megacities, andcontain significant quantities of hydrocarbons. Despite their importance, wedo not know which factors most significantly promote sediment accumulationand dominate delta formation. To investigate this issue, we present a globaldataset of 5399 coastal rivers and data on eight environmental variables.Of these rivers, 40 % (n=2174) have geomorphic deltas defined eitherby a protrusion from the regional shoreline, a distributary channel network,or both. Globally, coastlines average one delta forevery ∼300 km of shoreline, but there are hotspots of delta formation, for examplein Southeast Asia where there is one delta per 100 km of shoreline. Ouranalysis shows that the likelihood of a river to form a delta increases withincreasing water discharge, sediment discharge, and drainage basin area. Onthe other hand, delta likelihood decreases with increasing wave height andtidal range. Delta likelihood has a non-monotonic relationship withreceiving-basin slope: it decreases with steeper slopes, but for slopes >0.006 delta likelihood increases. This reflects differentcontrols on delta formation on active versus passive margins. Sedimentconcentration and recent sea level change do not affect delta likelihood. Alogistic regression shows that water discharge, sediment discharge, waveheight, and tidal range are most important for delta formation. The logisticregression correctly predicts delta formation 74 % of the time. Our globalanalysis illustrates that delta formation and morphology represent a balancebetween constructive and destructive forces, and this framework may helppredict tipping points at which deltas rapidly shift morphologies. 

   more » « less
5. Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

   https://doi.org/10.1029/2018JG004683  

   Shields, Michael R. ; Bianchi, Thomas S. ; Kolker, Alexander S. ; Kenney, William F. ; Mohrig, David ; Osborne, Todd Z. ; Curtis, Jason H. ( May 2019 , Journal of Geophysical Research: Biogeosciences)

   Wax Lake Delta, southern Louisiana, is a coastal delta that formed following the dredging of a river channel in 1941 and is a field model for investigating the geomorphology, ecology, carbon dynamics, and carbon storage capacity in young prograding deltas. However, it is unknown how the transition from subaqueous to subaerial sediments affects the sources and quality of the sequestered carbon. We investigated these variations within the sediments of Wax Lake Delta using amino acid, lignin, and stable carbon isotope compositions of the organic matter (OM). A principal component analysis of these proxies highlighted variability in organic carbon (OC) composition with changes in elevation. The transition from subaqueous to subaerial sediments at 0‐cm mean lower low water is an important component of the OM composition. In addition to the changes observed for OM source and quality, the OC loadings (OC/SA; mg C/m²) also increase as the delta aggrades and accumulates sediments with loadings typical of delta topsets and mobile mud banks (OC/SA < 0.4) to riverine sediments (0.5 < OC/SA < 1) and eventually to highly productive regions (OC/SA > 1). Linking this multiproxy approach with environmental variables such as elevation provides a path for incorporating OM dynamics into geomorphic models.

    

   more » « less