scholarly journals Influence of Catchment and Stream Characteristics on Suspended Solids and Phosphorus Concentrations Across an agriculturally Intensive Watershed in Southern Ontario

2021 ◽  
Author(s):  
Arsh Grewal
Keyword(s):  
Partial Least Squares Regression ◽  
Suspended Solids ◽  
Soluble Reactive Phosphorus ◽  
Least Squares Regression ◽  
Flow Conditions ◽  
Southern Ontario ◽  
Hydrological Characteristics ◽  
Creek Watershed ◽  
Reactive Phosphorus ◽  
The Relationship

The overall objective of this study is to determine the influence of landscape and hydrological characteristics on sub-catchment variability of total phosphorus (TP), soluble reactive phosphorus (SRP), the ratio of SRP and TP (SRP/TP), and total suspended solids (TSS). Fourteen longitudinal synoptic surveys were conducted for 13 sampling sites over a variety of flow conditions in the Innisfil Creek watershed located in southern Ontario. The surveys were split into baseflow and stormflow and partial least squares regression (PLSR) was used to analyze the relationship between watershed and hydrological characteristics, median concentrations of phosphorus, and TSS. The PLSR models indicate that buried tile drainage might be a major source of SRP in Innisfil Creek, while bank erosion is likely a dominant source of TSS. The results of this study can serve as the basis for future adaptive management experiments that seek to improve water quality in Innisfil Creek and beyond.

scholarly journals Influence of Catchment and Stream Characteristics on Suspended Solids and Phosphorus Concentrations Across an agriculturally Intensive Watershed in Southern Ontario

2021 ◽  
Author(s):  
Arsh Grewal
Keyword(s):  
Partial Least Squares Regression ◽  
Suspended Solids ◽  
Soluble Reactive Phosphorus ◽  
Least Squares Regression ◽  
Flow Conditions ◽  
Southern Ontario ◽  
Hydrological Characteristics ◽  
Creek Watershed ◽  
Reactive Phosphorus ◽  
The Relationship

The overall objective of this study is to determine the influence of landscape and hydrological characteristics on sub-catchment variability of total phosphorus (TP), soluble reactive phosphorus (SRP), the ratio of SRP and TP (SRP/TP), and total suspended solids (TSS). Fourteen longitudinal synoptic surveys were conducted for 13 sampling sites over a variety of flow conditions in the Innisfil Creek watershed located in southern Ontario. The surveys were split into baseflow and stormflow and partial least squares regression (PLSR) was used to analyze the relationship between watershed and hydrological characteristics, median concentrations of phosphorus, and TSS. The PLSR models indicate that buried tile drainage might be a major source of SRP in Innisfil Creek, while bank erosion is likely a dominant source of TSS. The results of this study can serve as the basis for future adaptive management experiments that seek to improve water quality in Innisfil Creek and beyond.

scholarly journals Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1947
Author(s):  
Ling Su ◽  
Chen Zhong ◽  
Lei Gan ◽  
Xiaolin He ◽  
Jinlei Yu ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Soluble Reactive Phosphorus ◽  
Particulate Phosphorus ◽  
Modified Bentonite ◽  
Combined Application ◽  
Water And Sediment ◽  
Phosphorus Form ◽  
Labile P ◽  
Reactive Phosphorus ◽  
Polyaluminium Chloride

The application of lanthanum modified bentonite (Phoslock®) and polyaluminium chloride (PAC) is popular in the restoration of European temperate lakes; however, the effects of the application on the concentrations of phosphorus (P) in both the water and the sediments have been poorly evaluated to date. We studied the effects of the application of Phoslock® + PAC on the concentrations of total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), total suspended solids (TSS) and chlorophyll a (Chla) in the water, and different P forms in the sediments, in an isolated part of Lake Yanglan. The results showed that the concentrations of TP, PP, SRP, TSS and Chla decreased significantly after the addition of Phoslock® + PAC. Moreover, the concentrations of labile-P, reductant-soluble-P and organic-P in the sediments were also significantly decreased after the Phoslock® + PAC application. However, the concentrations of both the stable apatite-P and residual-P in the sediments after application of Phoslock® + PAC were much higher than the pre-addition values, while the concentrations of metal-oxide-P did not differ significantly between the pre- and post- application conditions. Our findings imply that the combined application of Phoslock® and PAC can be used in the restoration of subtropical shallow lakes, to reduce the concentrations of P in the water and suppress the release of P from the sediments.

The Study of Para-Social Interaction with e-Word-of-Mouth for Influencer Marketing by Complex Computing

2022 ◽  
Vol 34 (3) ◽  
pp. 0-0
Keyword(s):  
Regression Analysis ◽  
Social Interaction ◽  
Online Survey ◽  
Partial Least Squares Regression ◽  
Word Of Mouth ◽  
Reliability And Validity ◽  
Least Squares Regression ◽  
Data Process ◽  
Analysis Methodology ◽  
The Relationship

The purpose of this study was focused on exploring the relationship among the fans’ preferences, fans’ para-social interaction, and fans’ word-of-mouth. A survey consisted of 21 items based on the literature review and developed by this study. An online survey was distributed to the users of YouTube in Taiwan. A total of 606 valid samples was collected by survey. The instrument passed the reliability and validity test. Further, the data process applied the PLS (partial least squares) regression analysis methodology. The result shows that the ‘attractive’ impacted ‘para-social interaction’, ‘e-word-of-mouth’, and ‘preferences of fans’ positively. In addition, the para-social interaction plays an important role as a mediator between influencer’s attractiveness, w-word-of-mouth, and preferences of fans. Some suggestions were provided for social media influence’ related studies as reference.

scholarly journals Nutrients retention in a small subtropical wetland (México)

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Martha B. Rendón-López ◽  
M. Luisa Suarez Alonso ◽  
Gloria L. Ayala-Ramirez ◽  
Yazmin Hernández-Linares ◽  
Alberto Gómez-Tagle Chavez ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Hydrological Cycle ◽  
Soluble Reactive Phosphorus ◽  
Nutrient Retention ◽  
Dry Period ◽  
Rainy Period ◽  
Subtropical Wetland ◽  
Macrophyte Community ◽  
Tropical Areas ◽  
Reactive Phosphorus

<p>In tropical areas very few studies have analysed wetlands’ ability to control nutrients. We analysed the efficiency of the Pátzcuaro subtropical wetland in Mexico to retain nutrients (total phosphorus: TP; soluble reactive phosphorus: PO<sub>4</sub><sup>3-</sup>, nitrite: NO<sub>2</sub><sup>-</sup> and nitrate: NO<sub>3</sub><sup>-</sup>) and total suspended solids (TSS) and its temporal variability from November 2011 to October 2012, where two hydrological different periods (dry and wet periods) were included. The results indicate that, annually, this wetland reduced TP, 30.4%; PO<sub>4</sub><sup>3-</sup>, 19.2%; NO<sub>2</sub><sup>-</sup>, 2.5%; NO<sub>3</sub><sup>-</sup>, 17.6%; and TSS, 14.7%. However, the reduction % rose to 55.3% for TP and to 47.3% for PO<sub>4</sub><sup>3-</sup> during the dry period and to 14.1 % for NO<sub>2</sub><sup>-</sup>, 49% for NO<sub>3</sub><sup>-</sup> and 44.5% for TSS during the rainy period. These results show dependence on the hydrological cycle, although P retention is also related with uptake by a dense macrophyte community and with organic matter accumulation. The results obtained suggest that removal of N is due mainly to denitrification. TSS retention seems to respond to low speed hydraulics and the resistance generated by macrophytes roots and floating plants. Like other studies in temperate environments, this wetland seems to remove more efficiently P than N. Unlike that  in temperate environments where the highest nutrient retention occurs in autumn, we found the highest retention values for both NO<sub>2</sub><sup>-</sup> and NO<sub>3</sub><sup>-</sup> during summer (rainy period), and the lowest for P, probably due to release of P for the senescence of wetland plants during this period.   </p>

scholarly journals Analyzing the Impact of Ambient Temperature Indicators on Transformer Life in Different Regions of Chinese Mainland

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Cui-fen Bai ◽  
Wen-Sheng Gao ◽  
Tong Liu
Keyword(s):  
Ambient Temperature ◽  
Least Squares ◽  
Partial Least Squares ◽  
Partial Least Squares Regression ◽  
Chinese Mainland ◽  
Least Squares Regression ◽  
Temperature Characteristics ◽  
Life Consumption ◽  
The Impact ◽  
The Relationship

Regression analysis is applied to quantitatively analyze the impact of different ambient temperature characteristics on the transformer life at different locations of Chinese mainland. 200 typical locations in Chinese mainland are selected for the study. They are specially divided into six regions so that the subsequent analysis can be done in a regional context. For each region, the local historical ambient temperature and load data are provided as inputs variables of the life consumption model in IEEE Std. C57.91-1995 to estimate the transformer life at every location. Five ambient temperature indicators related to the transformer life are involved into the partial least squares regression to describe their impact on the transformer life. According to a contribution measurement criterion of partial least squares regression, three indicators are conclusively found to be the most important factors influencing the transformer life, and an explicit expression is provided to describe the relationship between the indicators and the transformer life for every region. The analysis result is applicable to the area where the temperature characteristics are similar to Chinese mainland, and the expressions obtained can be applied to the other locations that are not included in this paper if these three indicators are known.

Spot Welding Quality Prediction Model Based on Partial Least-Squares Regression

2013 ◽  
Vol 740 ◽  
pp. 223-225
Author(s):  
Hui Zhao ◽  
Jian Jun Wu ◽  
An Du ◽  
Rui Na Ma ◽  
Yong Zhe Fan
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Spot Welding ◽  
Partial Least Squares Regression ◽  
Welding Process ◽  
Quality Prediction ◽  
Least Squares Regression ◽  
Welding Quality ◽  
Nugget Diameter ◽  
The Relationship

The relationship between spot welding process parameters and nugget diameter was selected and synthesized by partial least squares. The partial least squares regression model of spot welding quality was established. And the nugget diameter was predicted based on the model mentioned above. The results show that this model can be used to predict the spot welding quality.

Changes in water chemistry associated with beaver-impounded coastal marshes of eastern Georgian Bay

2013 ◽  
Vol 70 (6) ◽  
pp. 834-840 ◽  
Author(s):  
Amanda Fracz ◽  
Patricia Chow-Fraser
Keyword(s):  
Water Chemistry ◽  
Suspended Solids ◽  
Coastal Wetland ◽  
Soluble Reactive Phosphorus ◽  
Total Suspended Solids ◽  
Coastal Marshes ◽  
Georgian Bay ◽  
Reactive Phosphorus ◽  
Chemical Conditions ◽  
Unique Chemical

Coastal marshes of eastern Georgian Bay contain unique water chemistry that reflects mixing between the relatively ion-rich waters of Georgian Bay and the relatively ion-poor water draining the Canadian Shield landscape. These unique chemical characteristics may be dramatically altered when wetlands become hydrologically disconnected from Georgian Bay through beaver activity. We sampled 35 coastal marshes in Georgian Bay, 17 of which had beaver impoundments built at the outlet of the coastal wetland. Impounded marshes had significantly higher total phosphorus (30.2 versus 15.3 μg·L−1, p = 0.0015), soluble reactive phosphorus, (13.33 versus 3.7 μg·L−1, p ≤ 0.0001), total suspended solids (15.5 versus 2.1 mg·L−1, p ≤ 0.0001), turbidity (5.4 versus 1.6, p = 0.0004), and chlorophyll (6.2 versus 1.9 μg·L−1, p = 0.0004), but significantly lower pH (5.57 versus 6.95, p ≤ 0.0001), nitrates (0.03 versus 0.04 mg·L−1, p = 0.0416), and conductivity (47 versus 134 μS·cm−1, p ≤ 0.0001), indicative of reduced mixing with Georgian Bay. The mosaic of chemical conditions and altered hydrological connectivity associated with beaver impoundments in coastal marshes of Georgian Bay may affect the distribution of other wetland biota, and further studies should be conducted to ascertain these impacts.

Use of reflectance spectroscopy to estimate the organic carbon and CaCO3 contents of soils

2012 ◽  
Vol 61 (2) ◽  
pp. 277-290 ◽  
Author(s):  
Ádám Csorba ◽  
Vince Láng ◽  
László Fenyvesi ◽  
Erika Michéli
Keyword(s):  
Organic Carbon ◽  
Least Squares ◽  
Partial Least Squares ◽  
Partial Least Squares Regression ◽  
Mean Squared Error ◽  
Reflectance Spectroscopy ◽  
Least Squares Regression ◽  
Root Mean Squared Error ◽  
Squared Error

Napjainkban egyre nagyobb igény mutatkozik olyan technológiák és módszerek kidolgozására és alkalmazására, melyek lehetővé teszik a gyors, költséghatékony és környezetbarát talajadat-felvételezést és kiértékelést. Ezeknek az igényeknek felel meg a reflektancia spektroszkópia, mely az elektromágneses spektrum látható (VIS) és közeli infravörös (NIR) tartományában (350–2500 nm) végzett reflektancia-mérésekre épül. Figyelembe véve, hogy a talajokról felvett reflektancia spektrum információban nagyon gazdag, és a vizsgált tartományban számos talajalkotó rendelkezik karakterisztikus spektrális „ujjlenyomattal”, egyetlen görbéből lehetővé válik nagyszámú, kulcsfontosságú talajparaméter egyidejű meghatározása. Dolgozatunkban, a reflektancia spektroszkópia alapjaira helyezett, a talajok ösz-szetételének meghatározását célzó módszertani fejlesztés első lépéseit mutatjuk be. Munkánk során talajok szervesszén- és CaCO3-tartalmának megbecslését lehetővé tévő többváltozós matematikai-statisztikai módszerekre (részleges legkisebb négyzetek módszere, partial least squares regression – PLSR) épülő prediktív modellek létrehozását és tesztelését végeztük el. A létrehozott modellek tesztelése során megállapítottuk, hogy az eljárás mindkét talajparaméter esetében magas R2értéket [R2(szerves szén) = 0,815; R2(CaCO3) = 0,907] adott. A becslés pontosságát jelző közepes négyzetes eltérés (root mean squared error – RMSE) érték mindkét paraméter esetében közepesnek mondható [RMSE (szerves szén) = 0,467; RMSE (CaCO3) = 3,508], mely a reflektancia mérési előírások standardizálásával jelentősen javítható. Vizsgálataink alapján arra a következtetésre jutottunk, hogy a reflektancia spektroszkópia és a többváltozós kemometriai eljárások együttes alkalmazásával, gyors és költséghatékony adatfelvételezési és -értékelési módszerhez juthatunk.

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