Analysis of long-term (2002–2020) trends and peak events in total suspended solids concentrations in the Chesapeake Bay using MODIS imagery

2021 ◽  
Vol 299 ◽  
pp. 113550
Author(s):  
Ali P. Yunus ◽  
Yoshifumi Masago ◽  
Yasuaki Hijioka
Keyword(s):  
Chesapeake Bay ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Modis Imagery

scholarly journals Can Multispectral Information Improve Remotely Sensed Estimates of Total Suspended Solids? A Statistical Study in Chesapeake Bay

2018 ◽  
Vol 10 (9) ◽  
pp. 1393 ◽  
Author(s):  
Nicole DeLuca ◽  
Benjamin Zaitchik ◽  
Frank Curriero
Keyword(s):  
Water Quality ◽  
Random Forest ◽  
Chesapeake Bay ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Single Band ◽  
Random Forest Model ◽  
Validation Dataset ◽  
Forest Model

Total suspended solids (TSS) is an important environmental parameter to monitor in the Chesapeake Bay due to its effects on submerged aquatic vegetation, pathogen abundance, and habitat damage for other aquatic life. Chesapeake Bay is home to an extensive and continuous network of in situ water quality monitoring stations that include TSS measurements. Satellite remote sensing can address the limited spatial and temporal extent of in situ sampling and has proven to be a valuable tool for monitoring water quality in estuarine systems. Most algorithms that derive TSS concentration in estuarine environments from satellite ocean color sensors utilize only the red and near-infrared bands due to the observed correlation with TSS concentration. In this study, we investigate whether utilizing additional wavelengths from the Moderate Resolution Imaging Spectroradiometer (MODIS) as inputs to various statistical and machine learning models can improve satellite-derived TSS estimates in the Chesapeake Bay. After optimizing the best performing multispectral model, a Random Forest regression, we compare its results to those from a widely used single-band algorithm for the Chesapeake Bay. We find that the Random Forest model modestly outperforms the single-band algorithm on a holdout cross-validation dataset and offers particular advantages under high TSS conditions. We also find that both methods are similarly generalizable throughout various partitions of space and time. The multispectral Random Forest model is, however, more data intensive than the single band algorithm, so the objectives of the application will ultimately determine which method is more appropriate.

scholarly journals The Analysis of Water Quality Compliance of Jompo River Irrigation in Jember Regency

2021 ◽  
Vol 2 (1) ◽  
pp. 31-34
Author(s):  
Sri Wahyuningsih ◽  
Elida Novita ◽  
Idah Andriyani ◽  
Indarto Indarto
Keyword(s):  
Water Quality ◽  
Data Analysis ◽  
Irrigation Water ◽  
Government Regulation ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Average Value ◽  
Grade Ii

Jompo river is one of many tributaries in Jember regency has become one of water sources for residents nearby to meet their daily needs. People activities may lead to the emergence of pollution in Jompo river in long term. The measurement needs to determine water quality of the river. The research site ranged from Patrang to Kaliwates district with six nodes and covered a distance of 625 m. Based on the data analysis, average value of water quality in the river was characterized by 67 mg/l TSS (Total Suspended Solids), 72 mg/l TDS, pH at 6.73, 8.34 mg/l DO, 1.20 mg/l BOD, and EC at 145 µmhos/cm. Based on Government Regulation No. 82 of 2001 and Electricity value, the water quality of Jompo river was included in Grade II criteria. Jompo River was appropriate to irrigation water.

scholarly journals Effect of lockdown on wastewater characteristics: a comparison of two large urban areas

2020 ◽  
Vol 82 (12) ◽  
pp. 2813-2822
Author(s):  
Marie-Noëlle Pons ◽  
Pauline Louis ◽  
Davide Vignati
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Suspended Solids ◽  
Wastewater Treatment Plants ◽  
Carbon Sources ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Noticeable Effect ◽  
Kjeldahl Nitrogen

Abstract The effect of the lockdown imposed to limit the spread of SARS-CoV-2 in France between March 14 and May 11, 2020 on the wastewater characteristics of two large urban areas (with between 250,000 and 300,000 inhabitants) was studied. The number of outward and inward daily commuters was extracted from national census databases related to the population and their commuting habits. For urban area A, with the larger number of daily inward commuters (110,000, compared to 53,000 for B), lockdown was observed to have an effect on the monthly load averages of chemical oxygen demand, biochemical oxygen demand, total Kjeldahl nitrogen, total suspended solids and total phosphorus, all of which decreased (confidence level of 95%). This decrease, which varied between 20% and 40% and reached 45% for COD, can be related to the cessation of catering and activities such as hairdressing, which generate large amounts of graywater. The ammonium loads, due to the use of toilets before leaving for work and after returning from work, remained constant. In the case of urban area B, lockdown had no noticeable effect. More data would be necessary in the long term to analyze the effect of changes in the balance between ammonia and carbon sources on the operation of wastewater treatment plants.

Snowmelt Runoff and Total Solids Production in a Discontinuous Permafrost Basin

1993 ◽  
Vol 24 (2-3) ◽  
pp. 65-78
Author(s):  
Edw. F. Chacho
Keyword(s):  
Suspended Solids ◽  
Total Suspended Solids ◽  
Temperature Fluctuations ◽  
Water Yield ◽  
Snowmelt Runoff ◽  
Stream Discharge ◽  
Solids Concentration ◽  
Discontinuous Permafrost ◽  
Diurnal Fluctuations

Snowmelt runoff and total suspended solids were measured for two years on Glenn Creek, a small, second-order, subarctic stream located near Fairbanks, Alaska, within the Yukon-Tanana Uplands physiographic province. The stream drains a 2.25-km2 research watershed of which 70 % is underlain by permafrost. The two years of study represent very different snowmelt hydrographs due to differences in the snowpacks. In 1985, the snowpack was 180 % of the long-term average, while in 1988 it was only 56 % of the average. During both years, 60 % of the total snowmelt-season water yield had passed before a significant rate of solids yield was observed. Also in both years the peak in total suspended solids concentration lagged the stream discharge peak by three days. Diurnal fluctuations in discharge and total suspended solids concentrations are well-defined, including a peculiar occurrence of double diurnal peaks in the discharge hydrograph during portions of the snowmelt season. The diurnal fluctuations in solids concentration are shown to be consistent with water temperature fluctuations. In 1988, the percentage of organics in the total suspended solids was scattered from 0 % to 66 % during the snowmelt season.

scholarly journals Water quality in the Knysna estuary

Koedoe ◽  
1996 ◽  
Vol 39 (1) ◽  
Author(s):  
I.A. Russell
Keyword(s):  
Water Quality ◽  
Suspended Solids ◽  
Ad Hoc ◽  
Total Suspended Solids ◽  
Published Data ◽  
Secchi Disk ◽  
Secchi Disk Depth ◽  
Long Term Changes ◽  
Remedial Actions

Measurements of water temperature, salinity, pH, dissolved oxygen, secchi disk depth, turbidity and total suspended solids were taken monthly in the Knysna estuary between 1991 and 1994. Measurements of turbidity and total suspended solids of waters entering the Knysna estuary via rivers and man-made inlets were also taken on an ad hoc basis. These results are described and compared to published data on past water quality conditions. No clear long-term changes in water quality in the estuary were evident. High inputs of sediments from minor catchments indicate the necessity for remedial actions.

Lamella settlers for storm water treatment – performance and design recommendations

2013 ◽  
Vol 69 (2) ◽  
pp. 278-285 ◽  
Author(s):  
Stephan Fuchs ◽  
Ingo Mayer ◽  
Bernd Haller ◽  
Hartmut Roth
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Fine Particles ◽  
Removal Rate ◽  
Total Suspended Solids ◽  
Surface Load ◽  
Surface Loading ◽  
Definition Of ◽  
Event Basis

Three lamella settlers were monitored over a period of 4 years. The main objective was to determine removal efficiencies for total suspended solids and associated pollutants. For this purpose a new sampling method based on large volume solid samplers was developed allowing a detailed analysis of solids. With regard to total suspended solids the average removal efficiency of the plants range from 49 to 68%. Similar values could be achieved for phosphorus and heavy metals mainly because of the high portion of fine particles in treatment plants' influent. A clear dependency between solid removal efficiency and the parameters maximum surface load and influent concentration could be observed on a single event basis. The aggregation of all findings result in a recommended maximum design surface loading rate (SLR) of 4 m/h. A solid removal rate of 50%, which is defined as minimum long-term efficiency, can be achieved safely at this SLR. In addition to the definition of the maximum SLR, a proper dissipation of the inflow energy and an equal collection of the clear water above the lamellas turn out to be essential.

Establishing an empirical equation for the relationship between total suspended solids and total phosphorus concentrations in the downstream Red river water

2020 ◽  
Vol 20 (3) ◽  
pp. 325-332
Author(s):  
Le Nhu Da ◽  
Le Thi Phuong Quynh ◽  
Phung Thi Xuan Binh ◽  
Duong Thi Thuy ◽  
Trinh Hoai Thu ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Suspended Solids ◽  
Empirical Relationship ◽  
Water Environment ◽  
Total Suspended Solids ◽  
River System ◽  
Red River ◽  
Reservoir Impoundment ◽  
Downstream Section ◽  
Reasonable Prediction

Recently, the Asian rivers have faced the strong reduction of riverine total suspended solids (TSS) flux due to numerous dam/reservoir impoundment. The Red river system is a typical example of the Southeast Asian rivers that has been strongly impacted by reservoir impoundment in both China and Vietnam, especially in the recent period. It is known that the reduction in total suspended solids may lead to the decrease of some associated elements, including nutrients (N, P, Si) which may affect coastal ecosystems. In this paper, we establish the empirical relationship between total suspended solids and total phosphorus concentrations in water environment of the Red river in its downstream section from Hanoi city to the Ba Lat estuary based on the sampling campaigns conducted in the dry and wet seasons in 2017, 2018 and 2019. The results show a clear relationship with significant coefficient between total suspended solids and total phosphorus in the downstream Red river. It is expressed by a simple equation y = 0.0226x0.3867 where x and y stand for total suspended solids and total phosphorus concentrations (mg/l) respectively with the r2 value of 0.757. This equation enables a reasonable prediction of total phosphorus concentrations of the downstream Red river when the observed data of total suspended solids concentrations are available. Thus, this work opens up the way for further studies on the calculation of the total phosphorus over longer timescales using daily available total suspended solids values.

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