scholarly journals Characterization of Temporal and Spatial Variability of Phosphorus Loading to Lake Erie from the Western Basin Using Wavelet Transform Methods

Hydrology ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 50 ◽  
Author(s):  
Suresh Sharma ◽  
Deasy Nalley ◽  
Naba Subedi
Keyword(s):  
Wavelet Transform ◽  
Surface Runoff ◽  
Lake Erie ◽  
Soluble Reactive Phosphorus ◽  
Phosphorus Loading ◽  
Discrete Wavelet ◽  
Western Lake ◽  
Temporal And Spatial ◽  
Wavelet Spectra

The characterization of temporal and spatial patterns in phosphorus (P) loading in Lake Erie is essential in order to continue monitoring the excessive P condition that comes from the western Lake Erie Basin. This study aims to perform such a characterization using the continuous wavelet transform (CWT) and the discrete wavelet transform (DWT) methods. These wavelet transformations were conducted on streamflow data, TP loads, and soluble reactive phosphorus (SRP) of six stations located near Lake Erie of Northern Ohio. These stations are located near the outlet of Cuyahoga, Grand, Maumee, Vermilion, Raisin, and Sandusky watersheds. Long-term continuous P loading data, in which some dated back to 1970, were used in the analysis. The results obtained from the CWT and DWT approaches were found to complement each other. Streamflow had significant mixed variability at 1, 2, and 4 years. The variability for SRP was limited to 1 and 2 years while the TP variability was only seen at the 1-year scale. It was interesting to find that strong temporal patterns of SRP were observed in most of the watersheds only after the mid-1990s. The CWT wavelet spectra also reflected the land use characteristics of each watershed. For example, the wavelet spectra of surface runoff and TP for the agricultural watersheds (i.e., Raisin, Sandusky, and Maumee Rivers) were similar and characterized by significant variability primarily at the annual scale and at the two to four-year periodicities. The urbanized watershed (i.e., Cuyahoga River) did not show any association between either phosphorus (TP or SRP) with surface runoff and baseflow, which indicates that P in the urbanized watershed was not driven by the flow.

scholarly journals Characterization of sedimentary phosphorus in Lake Erie and on-site quantification of internal phosphorus loading

2021 ◽  
Vol 188 ◽  
pp. 116525
Author(s):  
Y.T. Wang ◽  
T.Q. Zhang ◽  
Y.C. Zhao ◽  
J.J.H. Ciborowski ◽  
Y.M. Zhao ◽  
...  
Keyword(s):  
Lake Erie ◽  
Phosphorus Loading ◽  
Internal Phosphorus Loading

scholarly journals Multiscale characterization of chronobiological signals based on the discrete wavelet transform

2000 ◽  
Vol 47 (1) ◽  
pp. 88-95 ◽  
Author(s):  
F.H.Y. Chan ◽  
B.M. Wu ◽  
E.K. Lam ◽  
P.W.F. Poon ◽  
A.M.S. Poon
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Discrete Wavelet

Effects of recent ecosystem changes on the recruitment of young-of-the-year fish in western Lake Erie

1998 ◽  
Vol 55 (12) ◽  
pp. 2572-2579 ◽  
Author(s):  
Gouthaman Gopalan ◽  
David A Culver ◽  
Lin Wu ◽  
Bruce K Trauben
Keyword(s):  
Lake Erie ◽  
White Perch ◽  
Fish Growth ◽  
Phosphorus Loading ◽  
Forage Fish ◽  
Diet Shift ◽  
Zooplankton Abundance ◽  
Forage Fishes ◽  
Western Lake ◽  
Young Of The Year

We compared the variability in forage fish recruitment over the last 27 years against major ecological changes that occurred in Lake Erie over the same time period. During a period of high adult walleye abundance and declining phosphorus loading (1976-1982), we observed a decline in the abundance of later hatching forage fish species (e.g., July) and those species that did not shift their diets from zooplankton to benthos during the summer of their life. During years of high young-of-the-year (YOY) white perch abundance (1983-1990), forage fishes whose hatching dates and (or) diet overlapped with YOY white perch declined in abundance. When the zebra mussel (Dreissena polymorpha) became abundant (1991-1995), most forage fishes showed no change in abundances. Given a YOY's ability to switch to benthos during summer, the date on which this occurred was determined by a combination of zooplankton abundance and fish size. Hence, the dates individual taxa of fish hatch relative to seasonal cycles of zooplankton abundance and the size at which they can undergo an ontogenetic diet shift to benthos and (or) fish could be influencing fish growth and recruitment and need to be incorporated into YOY recruitment models.

Trends in nutrient concentrations in Hatchery Bay, western Lake Erie, before and after Dreissena polymorpha

1995 ◽  
Vol 52 (6) ◽  
pp. 1202-1209 ◽  
Author(s):  
Ruth E. Holland ◽  
Thomas H. Johengen ◽  
Alfred M. Beeton
Keyword(s):  
Total Phosphorus ◽  
Dreissena Polymorpha ◽  
Lake Erie ◽  
Soluble Reactive Phosphorus ◽  
Water Clarity ◽  
Nutrient Concentrations ◽  
Phosphorus Concentration ◽  
Total Phosphorus Concentration ◽  
Western Lake ◽  
Western Lake Erie

Concentrations of soluble reactive phosphorus, ammonium-nitrogen, nitrate-nitrogen, silica, and chloride have all increased since the establishment of the zebra mussel (Dreissena polymorpha) in Hatchery Bay, western Lake Erie, in 1988. Total phosphorus concentrations have changed little. These results are from 188 samples collected weekly and year round before the establishment of Dreissena (1984–1987) and 192 samples post-Dreissena (1990–1993). The mean annual total phosphorus concentration for the three complete post-Dreissena years was 35 μg∙L−1 strikingly similar to the concentration of 36 μg∙L−1, which in 1959 helped to define the waters of Lake Erie as eutrophic. The relative steadiness in total phosphorus may reflect sediment reflux, because Hatchery Bay is a polymictic system. The slight increase in the biologically conservative ion, chloride, in the 1990s, is probably due to the increased precipitation and runoff in the western Lake Erie watershed. Decreased phytoplankton and associated increased water clarity caused by efficient filtering by D. polymorpha, have lessened symptoms of eutrophication and produced a situation where nutrients are not fully utilized, i.e., biological oligotrophy.

Multidimensional periodic discrete wavelets

2021 ◽  
Author(s):  
P. A. Andrianov
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Multiresolution Analysis ◽  
Discrete Wavelet ◽  
Discrete Wavelets ◽  
Definition Of

In this paper, the definition of a periodic discrete multiresolution analysis is provided. The characterization of such systems is obtained in terms of properties of scaling sequences. Wavelet systems generated by such multiresolution analyses are defined and described. Decomposition and reconstruction formulas for the associated discrete wavelet transform are provided.

scholarly journals Tile Drainage Increases Total Runoff and Phosphorus Export During Wet Years in the Western Lake Erie Basin

2021 ◽  
Vol 3 ◽  
Author(s):  
Samuel A. Miller ◽  
Steve W. Lyon
Keyword(s):  
Best Management Practices ◽  
Lake Erie ◽  
Nutrient Loading ◽  
Nitrate Concentration ◽  
Soluble Reactive Phosphorus ◽  
Tile Drainage ◽  
Nutrient Concentrations ◽  
Western Lake ◽  
The Impact ◽  
Western Lake Erie

Artificial subsurface (tile) drainage is used in many agricultural areas where soils have naturally poor drainage to increase crop yield and field trafficability. Studies at the field scale indicate that tile drains disproportionately export large soluble reactive phosphorus (SRP) and nitrate loads to downstream waterbodies relative to other surface and subsurface runoff pathways, but knowledge gaps remain understanding the impact of tile drainage to nutrient export at watershed scales. The Western Lake Erie Basin is susceptible to summertime eutrophic conditions driven by non-point source nutrient pollution due to a shallow mean water depth and land use dominated by agriculture. The purpose of this study is to analyze the impact of tile drainage on downstream discharge, nutrient concentrations, and nutrient loads for 16 watersheds that drain to the Western Lake Erie Basin. Daily discharge and nutrient concentrations were summarized annually and during the main nutrient loading period (March–July) for 2 years representing normal nutrient loading period precipitation (2018) and above normal precipitation (2019). Results indicate positive correlations between watershed tile drainage percentage and runoff metrics during 2019, but no relationship during 2018. Additionally, SRP concentration and load were positively correlated to watershed tile drainage percentage in 2019, but not in 2018. Watershed tile drainage percentage was correlated with nitrate concentration and load for both years. The SRP concentration-discharge relationships suggested relatively weak, chemodynamic behavior, implying a slight enriching effect where SRP concentrations were greater at higher stream discharge conditions during both years. In contrast, nitrate concentration-discharge relationships suggested strong, enriching chemodynamic behavior during 2018, but chemostatic behavior during 2019. The difference in SRP and nitrate export patterns in the 2 years analyzed highlights the importance of implementing appropriate best management practices that target specific nutrients and treat primary delivery pathways to effectively improve downstream aquatic health conditions.

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