Item talk:Q226942

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Project",
 "url": "https://www.usgs.gov/centers/oregon-water-science-center/science/water-quality-monitoring-during-reservoir-drawdowns",
 "headline": "Water-quality monitoring during reservoir drawdowns",
 "datePublished": "December 21, 2023",
 "author": [
   {
     "@type": "Person",
     "name": "Micelis C Doyle",
     "url": "https://www.usgs.gov/staff-profiles/micelis-c-doyle",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0003-0968-7809"
     }
   },
   {
     "@type": "Person",
     "name": "Heather M Bragg",
     "url": "https://www.usgs.gov/staff-profiles/heather-m-bragg"
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "601 SW 2nd Ave Ste 1950\nPortland, OR 97204\nUnited States"
   },
   {
     "@type": "TextObject",
     "text": "The U.S. Army Corps of Engineers (USACE) conducts reservoir drawdowns to help migrating juvenile spring Chinook (Oncorhynchus tshawytscha) and steelhead (Oncorhynchus mykiss) make it downstream past dams and increase their survival rates. Reservoirs are drawn down gradually until they are near the level of the dam\u2019s regulating outlet. The drawdowns can carry accumulated sediments and organic matter downstream affecting water clarity and possibly impacting dissolved oxygen (DO) levels. Transport and deposition of large amounts of sediment to downstream river reaches may have adverse effects on water-quality, aquatic life, and recreational use. Previous drawdowns at Fall Creek Dam resulted in temporarily high turbidity and suspended sediment concentrations and low DO levels (Schenk and Bragg, 2021). Water temperature is also influenced by dam operations. Thermal stratification occurs within reservoirs, where cold dense water sinks to the bottom with warmer, less dense water on top. This effectively alters river water temperatures. Due to multiple possible impacts of reservoir drawdowns, monitoring sediment and water-quality responses is necessary for reservoir managers. USACE is interested in understanding how the release of sediment influences turbidity, water temperature and DO in rivers downstream of the dams, where drawdowns have been mandated."
   },
   {
     "@type": "TextObject",
     "text": "In addition to water-quality, USGS monitoring efforts above, within, and below USACE reservoirs also include measuring reservoir lake levels, total-dissolved gas, water levels at dam tailwaters, and streamflow quantities. USGS water quantity data is valuable information for safety and flood risk management."
   },
   {
     "@type": "TextObject",
     "text": "The USGS is monitoring water-quality above, within, and below Middle Fork Willamette and the South Santiam River dams to understand how reservoir drawdowns influence downstream water-quality conditions."
   },
   {
     "@type": "TextObject",
     "text": "To help with this effort, USGS is monitoring turbidity, water temperature and DO in the South Santiam and Middle Willamette Rivers below Fall Creek, Lookout Point and Green Peter reservoirs. These data benefit USACE, environmental researchers and the public in understanding downstream temperature, turbidity and DO responses to drawdowns. In the long term, USGS monitoring can also provide important information in efforts to understand  the amount of time needed for water quality conditions to reach background levels expected in these waterways and defined by previous studies (Schenk and Bragg, 2014, 2021)."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Oregon Water Science Center",
   "url": "https://www.usgs.gov/centers/oregon-water-science-center"
 },
 "about": [
   {
     "@type": "Thing",
     "name": "Regional Water Research"
   },
   {
     "@type": "Thing",
     "name": "Willamette Basin"
   },
   {
     "@type": "Thing",
     "name": "surface water monitoring"
   },
   {
     "@type": "Thing",
     "name": "Army Corps of Engineers"
   },
   {
     "@type": "Thing",
     "name": "Energy"
   },
   {
     "@type": "Thing",
     "name": "Water"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analysis"
   },
   {
     "@type": "Thing",
     "name": "Chinook salmon"
   },
   {
     "@type": "Thing",
     "name": "Science Technology"
   },
   {
     "@type": "Thing",
     "name": "water temperature"
   },
   {
     "@type": "Thing",
     "name": "Dissolved oxygen"
   },
   {
     "@type": "Thing",
     "name": "Monitoring"
   },
   {
     "@type": "Thing",
     "name": "Watershed/Basin Studies"
   },
   {
     "@type": "Thing",
     "name": "Information Systems"
   },
   {
     "@type": "Thing",
     "name": "Steelhead trout"
   },
   {
     "@type": "Thing",
     "name": "turbidity"
   },
   {
     "@type": "Thing",
     "name": "Santiam River"
   },
   {
     "@type": "Thing",
     "name": "Environmental Health"
   },
   {
     "@type": "Thing",
     "name": "Lakes and Rivers"
   },
   {
     "@type": "Thing",
     "name": "Geology"
   },
   {
     "@type": "Thing",
     "name": "Water Quality"
   }
 ]

}