{"id":3329,"date":"2020-09-28T16:49:16","date_gmt":"2020-09-28T21:49:16","guid":{"rendered":"https:\/\/www.iowawatercenter.org\/?post_type=portfolio&#038;p=3329"},"modified":"2020-09-28T16:49:24","modified_gmt":"2020-09-28T21:49:24","slug":"time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations","status":"publish","type":"portfolio","link":"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/","title":{"rendered":"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations"},"content":{"rendered":"<p>Surface water from the Des Moines River is impaired by nitrate-nitrogen for drinking water use. Saylorville Reservoir is a 24.1 km2 impoundment of the Des Moines River located approximately 10 km north of the City of Des Moines. Monthly mean nitrate concentration data collected upstream and downstream of the reservoir for a 30-year period (1977-2006) are analyzed in this study. Our objective is to improve understanding of the reservoir effects on river nitrate concentrations. We hypothesize that monthly water quality downstream of the reservoir depends on the current monthly upstream water quality and its past lags. The dynamic relation is studied via a transfer function model that is shaped by reservoir characteristics such as surface area, volume, and discharge. Research results may used to better manage Saylorville Reservoir to mitigate nitrate concentrations in downstream receiving waters and forecast potential impairment to the Des Moines Water Works.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Surface water from the Des Moines River is impaired by nitrate-nitrogen for drinking water use. Saylorville Reservoir is a 24.1 km2 impoundment of the Des Moines River located approximately 10 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","portfolio_category":[10],"portfolio_tag":[],"class_list":["post-3329","portfolio","type-portfolio","status-publish","hentry","portfolio_category-statewide"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations - Iowa Water Center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations - Iowa Water Center\" \/>\n<meta property=\"og:description\" content=\"Surface water from the Des Moines River is impaired by nitrate-nitrogen for drinking water use. Saylorville Reservoir is a 24.1 km2 impoundment of the Des Moines River located approximately 10 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/\" \/>\n<meta property=\"og:site_name\" content=\"Iowa Water Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.iowawatercenter.org\/water-scholars-sign-up-form\/\" \/>\n<meta property=\"article:modified_time\" content=\"2020-09-28T21:49:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.iowawatercenter.org\/wp-content\/uploads\/2020\/08\/IMG_4940.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"750\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@iowawatercenter\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/\",\"url\":\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/\",\"name\":\"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations - Iowa Water Center\",\"isPartOf\":{\"@id\":\"https:\/\/www.iowawatercenter.org\/#website\"},\"datePublished\":\"2020-09-28T21:49:16+00:00\",\"dateModified\":\"2020-09-28T21:49:24+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.iowawatercenter.org\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Portfolios\",\"item\":\"https:\/\/www.iowawatercenter.org\/portfolio\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.iowawatercenter.org\/#website\",\"url\":\"https:\/\/www.iowawatercenter.org\/\",\"name\":\"Iowa Water Center\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.iowawatercenter.org\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.iowawatercenter.org\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.iowawatercenter.org\/#organization\",\"name\":\"Iowa Water Center\",\"url\":\"https:\/\/www.iowawatercenter.org\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.iowawatercenter.org\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.iowawatercenter.org\/wp-content\/uploads\/2020\/08\/IowaWaterCenterLogo-1.png\",\"contentUrl\":\"https:\/\/www.iowawatercenter.org\/wp-content\/uploads\/2020\/08\/IowaWaterCenterLogo-1.png\",\"width\":300,\"height\":44,\"caption\":\"Iowa Water Center\"},\"image\":{\"@id\":\"https:\/\/www.iowawatercenter.org\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.iowawatercenter.org\/water-scholars-sign-up-form\/\",\"https:\/\/x.com\/iowawatercenter\",\"https:\/\/www.youtube.com\/channel\/UCGNCbnIgs_oa3ZpW0mrJwfw\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations - Iowa Water Center","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.iowawatercenter.org\/portfolio\/time-series-modeling-of-reservoir-effects-on-river-nitrate-concentrations\/","og_locale":"en_US","og_type":"article","og_title":"Time-Series Modeling of Reservoir Effects on River Nitrate Concentrations - Iowa Water Center","og_description":"Surface water from the Des Moines River is impaired by nitrate-nitrogen for drinking water use. 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