Dynamics of particles and phosphorus in canals of the Lower Everglades, Florida, USA.

Autor: Onwuka IS; Department of Earth and Environment, Florida International University, Miami, FL 33199, USA; Institute of Environment, Florida International University, Miami, FL 33199, USA., Scinto LJ; Department of Earth and Environment, Florida International University, Miami, FL 33199, USA; Institute of Environment, Florida International University, Miami, FL 33199, USA. Electronic address: scintol@fiu.edu., Price RM; Department of Earth and Environment, Florida International University, Miami, FL 33199, USA; Institute of Environment, Florida International University, Miami, FL 33199, USA., Melesse AM; Department of Earth and Environment, Florida International University, Miami, FL 33199, USA; Institute of Environment, Florida International University, Miami, FL 33199, USA.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Dec 01; Vol. 902, pp. 166508. Date of Electronic Publication: 2023 Aug 22.
DOI: 10.1016/j.scitotenv.2023.166508
Abstrakt: Water flow (discharge) can affect water quality by influencing the concentration and transport of waterborne contaminants. The effects of discharge on phosphorus (P) and particle concentrations in managed canals, were described using concentration-discharge (C-Q) relationships, accumulation of suspended and settling particles, and the physicochemical characteristics of these particles and bed sediments. Piecewise regression analysis on C-Q relationships revealed slope inflections that denoted thresholds, where P-behavior changed from low to high discharge. The C-Q relationships generally showed higher concentrations at higher discharges. In three of the four Lower Everglades canals studied, long-term (1995-2019) lower temporal resolution data (daily to weekly) was adequate to describe the influence of discharge on P concentrations. However, in one site, the L-29 Canal, higher temporal resolution data (minutes to hours over weeks), derived from acoustic sensors, was necessary to produce C-Q relationships. In the L-29 Canal, discharge affected the transport, settling, and sediment accrual at distances from the S333 inflow structure. Sediment traps showed higher discharge led to a greater accumulation of suspended particles that were transported and settled farther downstream. Generally, downstream surface sediments in the L-29 Canal had greater organic matter, lower bulk density and higher TP than those of the upstream site, reflecting long-term effects of discharge. Understanding the effects of discharge on particles and associated nutrients, especially at discharge thresholds that lead to concentration increases, can inform the operation of managed canals to reduce contaminant loading to downstream sensitive ecosystems.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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