Item talk:Q228737

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Project",
 "url": "https://www.usgs.gov/centers/columbia-environmental-research-center/science/synthesis-hydrologic-and-geomorphic-drivers",
 "headline": "Synthesis of Hydrologic and Geomorphic Drivers of Riverine Habitat Dynamics",
 "datePublished": "August 30, 2018",
 "author": [
   {
     "@type": "Person",
     "name": "Robert Jacobson, PhD",
     "url": "https://www.usgs.gov/staff-profiles/robert-jacobson",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0002-8368-2064"
     }
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "Return to Riverine Habitat Dynamics"
   },
   {
     "@type": "TextObject",
     "text": "CERC scientists are developing a predictive understanding of rates and processes of river corridor habitat dynamics resulting from hydrologic and geomorphic sources by:"
   },
   {
     "@type": "TextObject",
     "text": "Addressing the Issue:"
   },
   {
     "@type": "TextObject",
     "text": "Return to River Studies"
   },
   {
     "@type": "TextObject",
     "text": "The Issue:"
   },
   {
     "@type": "TextObject",
     "text": "Return to River-Corridor Habitat Dynamics Research"
   },
   {
     "@type": "TextObject",
     "text": "Natural and human-influenced disturbances are transmitted through watersheds and may diminish or grow as they travel downstream (and sometimes upstream) over time.  Geomorphic adjustments are characterized by complex response: thresholds, feedbacks, and sediment-routing within watersheds result in non-linear, lagged, and unexpected cumulative changes in physical habitat.  There is a pressing need to understand broad-scale, long-term geomorphic responses to evaluate resource management and restoration options.  Current understanding is so poor that in many rivers there is difficulty in identifying the signal of human disturbance from among natural variation."
   },
   {
     "@type": "TextObject",
     "text": "Next Steps:"
   },
   {
     "@type": "TextObject",
     "text": "Habitats of many rivers of the US are perceived to be degraded as a result of human-induced stresses.  CERC scientist are focusing physical habitat as measured by depth, velocity, and substrate, in order to establish relevance of physical habitat to biota."
   },
   {
     "@type": "TextObject",
     "text": "Understanding the interaction of hydrology (flow regime) and geomorphology (channel morphology) is critical for evaluating habitat loss and degradation, and for guiding river restoration designs.  Where it is reasonable to neglect the effects of sediment transport, the spatial and temporal distribution of physical habitat can be modeled with operational multidimensional hydraulic models that calculate changes in habitat with changing discharge \u2013 hydrodynamic time scales.  This technique is maturing, but challenges remain in the areas of optimizing model formulation (data density, calibration/verification standards, biologically meaningful model scales), defining biological significance of physical habitats, and understanding spatial and temporal patterns.  More importantly, in most rivers significant sediment transport takes place and channel geometry changes over time.  These geomorphic effects are poorly captured in available research models: there is a pressing need to address the coupling of geomorphic and hydrologic habitat dynamics."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Columbia Environmental Research Center",
   "url": "https://www.usgs.gov/centers/columbia-environmental-research-center"
 },
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     "@type": "Thing",
     "name": "Geology"
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   {
     "@type": "Thing",
     "name": "Large River Ecology, Restoration, and Management"
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     "name": "Environmental Health"
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     "name": "Riverine Habitat Dynamics"
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     "name": "Ecosystems"
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