Illinois River CREP: Sediment and Nutrient Delivery Assessment

Demissie, Misganaw; Slowikowski, James A.; Keefer, Laura; Stevenson, Kip E.

doi:10.1061/40976(316)334

Cited by 1 publication

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other long‐term sediment budgets have also indicated considerable sediment deposition in the mainstem of the Illinois River (Demissie et al. 2016). This accumulated sediment can be a source of legacy P through remobilization of previously deposited sediments and desorption of P from sediments.…”

Section: Resultsmentioning

confidence: 98%

“…A yield less than zero indicates greater incoming than outgoing TP or net deposition of TP in this drainage area. The Illinois River downstream from Marseilles has a very low gradient, and extensive sediment deposition in the lower river has been reported by Demissie et al (2016). Because much riverine P is attached to sediment, sediment deposition in this stretch of the river may account for much of the net deposition of P.…”

Section: Incremental Tp Yieldsmentioning

confidence: 97%

“…The TSS load at Valley City decreased by 14% (423 Gg/year), but during both time periods, the annual average TSS load at Valley City was less than the combined loads from upstream, indicating TSS deposition in the lower mainstem but with less deposition occurring in 2015-2019. Other long-term sediment budgets have also indicated considerable sediment deposition in the mainstem of the Illinois River (Demissie et al 2016). This accumulated sediment can be a source of legacy P through remobilization of previously deposited sediments and desorption of P from sediments.…”

Section: Lower Tributaries and Lower Mainstem Subbasinmentioning

confidence: 99%

“…The Illinois River downstream from Marseilles has a very low gradient (about 0.007%), and extensive sediment deposition in the lower river has been reported by Demissie et al (2016). Seven tributaries to the Illinois River downstream from Marseilles are monitored, which we refer to collectively as the lower JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION tributaries.…”

Section: Geographic Setting: Illinois River Basinmentioning

confidence: 99%

See 3 more Smart Citations

Spatial and Temporal Variations in Phosphorus Loads in the Illinois River Basin, Illinois USA

McIsaac

Hodson

Markus

et al. 2022

J American Water Resour Assoc

View full text Add to dashboard Cite

Total phosphorus (TP) loads in many rivers in the north‐central United States have increased, including the Illinois River at Valley City, Illinois, USA, which increased 39% from the periods 1989–1996 to 2015–2019 despite efforts to reduce loads from point and nonpoint sources. Here, we quantify long‐term variations in phosphorus (P) loads in the Illinois River and its tributaries and identify factors that may be causing the variations. We calculated river loads of dissolved (DP) and particulate P (PP), total and volatile suspended solids (TSS and VSS), and other potentially related constituents at 41 locations. DP loads generally increased and PP and TSS loads generally decreased from 1989–1996 to 2015–2019. During 1989–1996, P accumulated in the lower basin between Marseilles and Valley City (excluding monitored tributaries). This portion of the basin is very flat and accumulates sediment. During 2015–2019, this section shifted from being a net sink to being a net source of P, accounting for 78% of the increased TP load at Valley City. We present evidence supporting several mechanisms that could have caused this shift: increased DP and chloride loads, reduced sulfate and nitrate concentrations influencing ionic strength and redox potential in the sediments, and increased VSS loads at Valley City possibly indicating greater algal production and contributing to hypoxia in lower river sediments. Additional research is needed to quantify the relative importance of these mechanisms.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Incremental Tp Yieldsmentioning

confidence: 97%

Section: Lower Tributaries and Lower Mainstem Subbasinmentioning

confidence: 99%

Section: Geographic Setting: Illinois River Basinmentioning

confidence: 99%

See 2 more Smart Citations