Wyniki wyszukiwania - BazTech

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The Interaction of Chlorophyll-a and Total Suspended Matter along the Western Semarang Bay, Indonesia, Based on Measurement and Retrieval of Sentinel 3

Maslukah Lilik, Ismunarti Dwi Haryo, Widada Sugeng, Sandi Nur Fikri, Prayitno Hanif Budi

Journal of Ecological Engineering

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2022

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Vol. 23, nr 10

191--201

EN

The Kendal Regency area is one of the areas on the northern coast of Central Java that has been experiencing rapid industrial development. The high human activity in this area will impact the quality of water in these surrounding areas and affect the fertility of the waters. The concentrations of chlorophyll-a (Chl-a) and total suspended matter (TSM) are major water quality parameters that can be retrieved using remotely sensed data. The retrieval satellite of the 3 OLCI chosen in this study has a 300 m spatial resolution. This study aimed to see the distribution and effect of total suspended matter (TSM) on chlorophyll-a based on measurement and retrieval of Sentinel 3 imagery using the linear regression method. The results show the chlorophyll-a distribution and the value from retrieval satellite are higher and occur over larger surface area compared to chlorophyll-a measurements. The linear regression model of chlorophyll-a by retrieval satellite imagery and measurement is y = 0.65x + 4.65 with R2 = 0.54. The presence of high amounts of suspended solids in the waters causes disturbances in the reflectance values, which are recorded by the retrieval of satellite. The model regression chlorophyll-a with TSM accuracy from retrieval satellite results in the equation y = -0.0416x + 5.14 (R2 = 0.45, p = 0.05, n = 13). The determination (R2) coefficient value is 0.445, which means that suspended solids have a 44.5% effect on chlorophyll-a and 55.5% is influenced by other factors and not examined in this study. The results show that TSM has an influence on the accuracy of chlorophyll-a and retrieval satellite recording can be disrupted if waters have high turbidity.

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Synergic use of neural networks model and remote sensing algorithms to estimate water clarity indicators in Khanpur reservoir, Pakistan

Faizi Fiza, Mahmood Khalid

Acta Geophysica

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2022

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Vol. 70, no 3

1433--1443

EN

Freshwater reservoirs are limited and facing issues of over-exploitation, climate change effects and poor maintenance which have serious consequences for water quality. Developing countries face the challenge of collecting in situ information on ecological status and water quality of these reservoirs due to constraints of cost, time and infrastructure. In this study, a practical method of retrieval of two water clarity indicators, total suspended matter and secchi disk depth, using Sentinel-2 satellite data is adopted for preliminary assessment of water quality and trophic conditions in Khanpur reservoir, Pakistan. The study explores the synergy of utilizing two independent models, i.e., case 2 regional coast color analytical neural network model and semiempirical remote sensing algorithms to understand the spatiotemporal dynamics of water clarity patterns in the dammed reservoir, in the absence of ground measurements. The drinking water quality and trophic state of the reservoir water is determined based purely on satellite measurements. Out of the five months studied, the reservoir water has high turbidity and poor eutrophic status in three months. The results from both computational models are compared, which exhibit a high degree of statistical agreement. The study demonstrates the effective utilization of relevant analytical and semiempirical methods on satellite data to map water clarity indicators and understand their dynamics in both space and time. This solution is particularly useful for regions where routine ground sampling and observation of environmental variables are absent.

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Oznaczanie zawiesiny ogólnej - metoda z wykorzystaniem filtrów membranowych

Nocoń W.

Laboratorium - Przegląd Ogólnopolski

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2006

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nr 11

10--11

PL

Niniejszy artykuł zawiera informacje na temat zalet i wad wykorzystania filtrów membranowych do oznaczenia zawiesiny ogólnej. Opisano w nim również metodykę wykonania oznaczeń.

EN

This article includes informations about advantages and disadvantages of using membrane filters to indicate total suspended matter in water. There is described methodology of that indication.

4

Studies of mine water treatment efficiency for field II in Turów brown coal mine

Hoffman K., Mrówczyńska H., Hoffman J.

Chemia i Inżynieria Ekologiczna

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2004

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Vol. 11, nr 9

891--905

EN

Physicochemical data collected during the start-up operation of a mine water treatment plant for field II of the Turów Brown Coal Mine have been presented. The mine water is polluted mainly with suspended matter and to a lesser extent with sulphates(VI). A mine water treatment project, consisting in the use of a coagulation process and the appropriate setting of the water treatment plant's operating parameters, was carried out. As a result, the mine water after purification bas been rated as belonging to cleanliness class I and II.

PL

Przedstawiono dane fizykochemiczne otrzymane w trakcie rozruchu i pracy oczyszczalni wód kopalnianych z pola II odkrywki "Turów". Stwierdzono, że głównym zanieczyszczaniem wód kopalnianych odkrywki węgla brunatnego jest zawiesina ogólna i siarczany(VI). Zastosowanie w trakcie oczyszczania koagulacji i odpowiednie dobranie parametrów pracy oczyszczalni pozwoliło na zakwalifikowanie wód kopalnianych po oczyszczeniu do I i II klasy czystości.