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Journal articles on the topic 'Water quality state estimation'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Munavalli, G. R., and M. S. Mohan Kumar. "Water Quality Parameter Estimation in Steady-State Distribution System." Journal of Water Resources Planning and Management 129, no. 2 (2003): 124–34. http://dx.doi.org/10.1061/(asce)0733-9496(2003)129:2(124).

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2

Xu, Daxing, Hailun Wang, and Lu Zhang. "A new water quality state estimation method with an unknown state model." DESALINATION AND WATER TREATMENT 217 (2021): 174–80. http://dx.doi.org/10.5004/dwt.2021.26755.

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3

Łangowski, Rafał, and Mietek Brdys. "Monitoring of Chlorine Concentration in Drinking Water Distribution Systems Using an Interval Estimator." International Journal of Applied Mathematics and Computer Science 17, no. 2 (2007): 199–216. http://dx.doi.org/10.2478/v10006-007-0019-y.

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Monitoring of Chlorine Concentration in Drinking Water Distribution Systems Using an Interval EstimatorThis paper describes the design of an interval observer for the estimation of unmeasured quality state variables in drinking water distribution systems. The estimator utilizes a set bounded model of uncertainty to produce robust interval bounds on the estimated state variables of the water quality. The bounds are generated by solving two differential equations. Hence the numerical efficiency is sufficient for on-line monitoring of the water quality. The observer is applied to an exemplary wat

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Salem, Aly K., Ahmad F. Taha, and Ahmed A. Abokifa. "Graph neural networks-based dynamic water quality state estimation in water distribution networks." Engineering Applications of Artificial Intelligence 138 (December 2024): 109426. http://dx.doi.org/10.1016/j.engappai.2024.109426.

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5

Choi, Hyoung-Sub, In-Cheol Cho, Jong-Hwan Byun, Byung-Hyun Moon, and Jong-Soo Heo. "Estimation of Water Quality and Trophic State in the Hapcheon Lake." Korean Journal of Environmental Agriculture 22, no. 1 (2003): 1–6. http://dx.doi.org/10.5338/kjea.2003.22.1.001.

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Munavalli, G. R., and M. S. Mohan Kumar. "Water quality parameter estimation in a distribution system under dynamic state." Water Research 39, no. 18 (2005): 4287–98. http://dx.doi.org/10.1016/j.watres.2005.07.043.

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7

Rauch, W., M. Henze, L. Koncsos, et al. "River water quality modelling: I. State of the art." Water Science and Technology 38, no. 11 (1998): 237–44. http://dx.doi.org/10.2166/wst.1998.0473.

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River water quality models are used extensively in research as well as in the design and assessment of water quality management measures. The application of mathematical models for that purpose dates back to the initial studies of oxygen depletion due to organic waste pollution. Since then, models have been constantly refined and updated to meet new and emerging problems of surface water pollution, such as eutrophication, acute and chronic toxicity, etc. In order to handle the complex interactions caused by the increased influence of human activities in rivers it is today mandatory to couple r

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Łangowski, Rafał, and Mietek A. Brdys. "An Interval Estimator for Chlorine Monitoring in Drinking Water Distribution Systems Under Uncertain System Dynamics, Inputs and Chlorine Concentration Measurement Errors." International Journal of Applied Mathematics and Computer Science 27, no. 2 (2017): 309–22. http://dx.doi.org/10.1515/amcs-2017-0022.

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AbstractThe design of an interval observer for estimation of unmeasured state variables with application to drinking water distribution systems is described. In particular, the design process of such an observer is considered for estimation of the water quality described by the concentration of free chlorine. The interval observer is derived to produce the robust interval bounds on the estimated water quality state variables. The stability and robustness of the interval observer are investigated under uncertainty in system dynamics, inputs, initial conditions and measurement errors. The bounds

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Shakhman, I. A., and N. S. Loboda. "Water quality estimation at the gauge station of the Ingulets River, town of Snigurivka, by hydrochemical parameters." Ukrainian hydrometeorological journal, no. 17 (October 29, 2017): 123–36. http://dx.doi.org/10.31481/uhmj.17.2016.14.

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The article contains the results of water quality estimation by hydrochemical parameters at the gauge station of the Ingulets River, town of Snigurivka, during the observation period of 2001-2014 based on modern calculation methods. The analysis of anthropogenic factors affecting change of quality of surface water of the Ingulets River was used. It was found that by hydrochemical parameters waters are mostly "contaminated", "very contaminated", or "catastrophically contaminated". River flow appears to be the main source of water supply for the population and the economy. There is an acute defi

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10

Hohls, D., G. du Plessis, S. N. Venter, et al. "Estimation of the fate of microbial water quality contaminants in a South African river." Water Science and Technology 31, no. 5-6 (1995): 271–74. http://dx.doi.org/10.2166/wst.1995.0623.

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The aim of this study was to evaluate the validity of assumptions, regarding assimilative capacity for microbial contaminants, implicit in microbial water quality management in South Africa. A one dimensional steady state stream water quality model, assuming first order decay of microbial water quality variables, was employed in an attempt to describe and predict microbial water quality in the chosen catchment. Based on the faecal coliform counts the results indicated that the processes of decay and dilution were inadequate to yield water quality which complied with South African and internati

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11

Deng, Fuliang, Wenhui Liu, Mei Sun, et al. "Fine Estimation of Water Quality in the Yangtze River Basin Based on a Geographically Weighted Random Forest Regression Model." Remote Sensing 17, no. 4 (2025): 731. https://doi.org/10.3390/rs17040731.

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Water quality evaluation usually relies on limited state-controlled monitoring data, making it challenging to fully capture variations across an entire basin over time and space. The fine estimation of water quality in a spatial context presents a promising solution to this issue; however, traditional analyses often ignore spatial non-stationarity between variables. To solve the above-mentioned problems in water quality mapping research, we took the Yangtze River as our study subject and attempted to use a geographically weighted random forest regression (GWRFR) model to couple massive station

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12

Belal, Abdallah Ahmed Adam, and Lingala Kalyan Viswanath Reddy. "Estimation of Hardness Level and Total Dissolved Solids in Ground Water at Shendi Town, River Nile State, Sudan." Applied Sciences Research Periodicals 2, no. 4 (2024): 21–29. http://dx.doi.org/10.63002/asrp.24.442.

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Water is life but hardness in water is harmful to human health. This descriptive and analytical study was conducted to determine the levels of hardness and concentration of Total Dissolved Solids (TDS) in drinking water in Shendi town of Sudan. The drinking water samples of 150 (50 samples for each season) were collected from wells, distribution channels and storage facilities and tested per season. The analysis of these samples was done using photometer device to determine the water hardness and result is displayed as mg/l CaCO3, while for estimation of TDS Conductivity / TDS meter and result

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13

Giovanelli, Luan B., Rubens A. Oliveira, Jair C. Oliveira-Filho, Júlio C. M. Baptestini, Fábio T. Delazari, and Gilberto C. Sediyama. "Reference evapotranspiration estimation by the Irrigameter in Southern Tocantins State, Brazil." Revista Brasileira de Engenharia Agrícola e Ambiental 21, no. 5 (2017): 293–97. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n5p293-297.

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ABSTRACT The choice for the most appropriate method to estimate evapotranspiration depends on the availability of meteorological data, required level of precision and cost of equipment acquisition. For this estimate, the Irrigameter is simple to operate, precise and economically viable to farmers. In addition, it collaborates in the application of the necessary water depth to crops, thus avoiding unnecessary energy consumption, environmental degradation, and increasing crop yield and improving crop quality. In this context, the objective of this research was to estimate the reference evapotran

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Vieira, J. M. P., J. L. S. Pinho, N. Dias, D. Schwanenberg, and H. F. P. van den Boogaard. "Parameter estimation for eutrophication models in reservoirs." Water Science and Technology 68, no. 2 (2013): 319–27. http://dx.doi.org/10.2166/wst.2013.248.

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Excessive eutrophication is a major water quality issue in lakes and reservoirs worldwide. This complex biological process can lead to serious water quality problems. Although it can be adequately addressed by applying sophisticated mathematical models, the application of these tools in a reservoir management context requires significant amounts of data and large computation times. This work presents a simple primary production model and a calibration procedure that can efficiently be used in operational reservoir management frameworks. It considers four state variables: herbivorous zooplankto

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Rajakumar, Anjana G., M. S. Mohan Kumar, Bharadwaj Amrutur, and Zoran Kapelan. "Real-Time Water Quality Modeling with Ensemble Kalman Filter for State and Parameter Estimation in Water Distribution Networks." Journal of Water Resources Planning and Management 145, no. 11 (2019): 04019049. http://dx.doi.org/10.1061/(asce)wr.1943-5452.0001118.

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Rodriguez-Mata, Abraham Efraim, Yaneth Bustos-Terrones, Victor Gonzalez-Huitrón, Pablo Antonio Lopéz-Peréz, Omar Hernández-González, and Leonel Ernesto Amabilis-Sosa. "A Fractional High-Gain Nonlinear Observer Design—Application for Rivers Environmental Monitoring Model." Mathematical and Computational Applications 25, no. 3 (2020): 44. http://dx.doi.org/10.3390/mca25030044.

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The deterioration of current environmental water sources has led to the need to find ways to monitor water quality conditions. In this paper, we propose the use of Streeter–Phelps contaminant distribution models and state estimation techniques (observer) to be able to estimate variables that are very difficult to measure in rivers with online sensors, such as Biochemical Oxygen Demand (BOD). We propose the design of a novel Fractional Order High Gain Observer (FOHO) and consider the use of Lyapunov convergence functions to demonstrate stability, as it is compared to classical extended Luenberg

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17

Yamada, William, Jerry Cherney, Debbie Cherney, Troy Runge, and Matthew Digman. "Handheld Near-Infrared Spectroscopy for Undried Forage Quality Estimation." Sensors 24, no. 16 (2024): 5136. http://dx.doi.org/10.3390/s24165136.

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This study investigates the efficacy of handheld Near-Infrared Spectroscopy (NIRS) devices for in-field estimation of forage quality using undried samples. The objective is to assess the precision and accuracy of multiple handheld NIRS instruments—NeoSpectra, TrinamiX, and AgroCares—when evaluating key forage quality metrics such as Crude Protein (CP), Neutral Detergent Fiber (aNDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), in vitro Total Digestibility (IVTD)and Neutral Detergent Fiber Digestibility (NDFD). Samples were collected from silage bunkers across 111 farms in New York

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18

Suleiman, Ahmad Abubakar, Usman Aliyu Abdullahi, Aminu Suleiman, Suleiman Abubakar Suleiman, and Hassan Umar Abubakar. "Correlation and Regression Model for Physicochemical Quality of Groundwater in the Jaen District of Kano State, Nigeria." Journal of Statistical Modelling and Analytics 4, no. 1 (2022): 14–24. http://dx.doi.org/10.22452/josma.vol4no1.2.

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Thirty (30) samples of groundwater from various locations in the district of Jaen were obtained and analysed for drinking and other domestic purposes. Twelve (12) physical and chemical (physicochemical) groundwater quality parameters such as electrical conductivity (EC), pH, total dissolved solid (TDS), total hardness (TH), calcium (Ca), magnesium (Mg), nitrate (NO3), potassium (K), zinc (Zn), chromium (Cr), copper (Cu) and Manganese (Mn) were selected and analyzed in this study. The conventional remote sensing techniques used for monitoring and estimation of water parameters are typically bas

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19

Suzuki, M., K. Chihara, M. Okada, H. Kawashima, and S. Hoshino. "Development of Dialog System Model for Eutrophication Control between Discharging River Basin and Receiving Water Body – Case Study of Lake Sagami (Japan)." Water Science and Technology 21, no. 12 (1989): 1821–24. http://dx.doi.org/10.2166/wst.1989.0178.

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A computer program based on expert system software was developed and proposed as a prototype model for water management to control eutrophication problems in receiving water bodies (Suzuki etal., 1988). The system has several expert functions: 1. data input and estimation of pollution load generated and discharged in the river watershed; 2. estimation of pollution load run-off entering rivers; 3. estimation of water quality of receiving water bodies, such as lakes; and 4. assisting man-machine dialog operation. The program can be used with MS-DOS BASIC and assembler in a 16 bit personal comput

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20

Gopchak, І. V., and T. O. Basiuk. "ESTIMATION OF ANTHROPOGENIC LOAD ON THE VESELUKHA SMALL RIVER BASIN." Міжвідомчий тематичний науковий збірник "Меліорація і водне господарство", no. 1 (July 22, 2019): 82–87. http://dx.doi.org/10.31073/mivg201901-163.

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Relevance of research. As a result of economic activities and irrational use of water and land resources in small river basins there are problems connected with pollution, destruction of natural landscape complexes of river valleys and adjoining territories, engineering reorganization of canals and floodplains as a result of melioration works. All these changes in river basins require operational control and response, which is possible only if real estimation of the level of anthropogenic load on river basins is carried out and the limits of permissible economic interference in their ecosystem

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21

Msusa, Anastazia Daniel, Dalin Jiang, and Bunkei Matsushita. "A Semianalytical Algorithm for Estimating Water Transparency in Different Optical Water Types from MERIS Data." Remote Sensing 14, no. 4 (2022): 868. http://dx.doi.org/10.3390/rs14040868.

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Water transparency (or Secchi disk depth: ZSD) is a key parameter of water quality; thus, it is very important to routinely monitor. In this study, we made four efforts to improve a state-of-the-art ZSD estimation algorithm that was developed in 2019 on the basis of a new underwater visibility theory proposed in 2015. The four efforts were: (1) classifying all water into clear (Type I), moderately turbid (Type II), highly turbid (Type III), or extremely turbid (Type IV) water types; (2) selecting different reference wavelengths and corresponding semianalytical models for each water type; (3) e

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22

Sherjah, P. Y., N. Sajikumar, and P. T. Nowshaja. "Semi-analytical model for TSI estimation of inland water bodies from Sentinel 2 imagery." Journal of Hydroinformatics 24, no. 2 (2022): 444–63. http://dx.doi.org/10.2166/hydro.2022.151.

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Abstract Regular monitoring of inland water bodies is essential to identify the areas of deteriorating water quality and to take measures to curb the impairment. The present study aims to develop a semi-analytical model for estimating Trophic State Index (TSI) from Sentinel 2 (S2) imagery. A semi-analytical algorithm, QAA-v6, is parameterized for S2 data (referred to as QAA-S2) based on the correlation between the retrieved inherent optical properties (IOPs) from S2 imagery and the measured TSI data of Milford Lake in the USA. The accuracy of estimation of TSI by this modified model from three

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23

Díaz, Sarai, Roberto Mínguez, and Javier González. "Probabilistic leak detectability assessment via state estimation in water transport networks." Stochastic Environmental Research and Risk Assessment 32, no. 7 (2018): 2111–28. http://dx.doi.org/10.1007/s00477-018-1515-3.

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24

Dick, Asiton-a. Asifamabia, and Susan Chioma Okparanta. "Drinking Wells and River Water Quality Assessment in Oproama Community, Rivers State, Nigeria." Archives of Current Research International 23, no. 3 (2023): 33–41. http://dx.doi.org/10.9734/acri/2023/v23i3563.

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Aims: The hand-dug wells and river water in Oproama Community, Rivers State, Nigeria was assessed for its quality. Study Design: The study involved ten (10) sampling stations consisting of seven (7) hand-dug wells and three (3) points along the Oproama River. Place and Duration of Study: Oproama Community in Asari-toru Local Government Area of Rivers State, Nigeria between January and December, 2011 to cover both dry and wet seasons. Methodology: The parameters assessed were Vibrio (bacteria), salinity, calcium, magnesium concentrations as well as saltwater intrusion status e

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25

Masliev, I., and L. Somlyódy. "PROBABILISTIC METHODS FOR UNCERTAINTY ANALYSIS AND PARAMETER ESTIMATION FOR DISSOLVED OXYGEN MODELS." Water Science and Technology 30, no. 2 (1994): 99–108. http://dx.doi.org/10.2166/wst.1994.0033.

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Water quality models are essential to the development of least-cost water quality control strategies based on ambient criteria. Such policies are particularly important if financial resources are limited which is currently the case in Central and Eastern European countries. In turn, the derivation of realistic model parameters is a pre-requisite of successful model application. Often, longitudinal water quality profile measurements are performed for the above purpose, but the traditional evaluation of this data encounters significant difficulties due to measurement and other uncertainties. Thu

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Jarek, Tiago Miguel, Jorge Luiz Moretti de Souza, Nerilde Favaretto, and Lucimeris Ruaro. "Water quality of the reservoirs used for irrigation in São José dos Pinhais, Paraná State, Brazil." Ciência Rural 46, no. 4 (2016): 626–31. http://dx.doi.org/10.1590/0103-8478cr20150420.

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ABSTRACT: Land use outside its agricultural potential and low vegetation cover in the watershed impair the quality of water used for irrigation and may contribute to the spread of pathogenic coliform bacteria. The objective of this study was to relate the quality of irrigation water with the intensity and type of land use and the rainfall in a vegetable-producing region of São José dos Pinhais, Paraná. Water samples were collected monthly in 2013 from two reservoirs and one preserved source. After collection, the samples were chilled in Styrofoam boxes and transported to the laboratory for ana

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Ciavatta, S., R. Pastres, Z. Lin, M. B. Beck, C. Badetti, and G. Ferrari. "Fault detection in a real-time monitoring network for water quality in the lagoon of Venice (Italy)." Water Science and Technology 50, no. 11 (2004): 51–58. http://dx.doi.org/10.2166/wst.2004.0670.

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In the context of monitoring water quality in natural ecosystems in real time, on-line data quality control is a very important issue for effective system surveillance and for optimizing maintenance of the monitoring network. This paper presents some applications of recursive state-parameter estimation algorithms to real-time detection of signal drift in high-frequency observations. Two continuous-discrete recursive estimation schemes, namely the Extended Kalman Filter and the Recursive Prediction Error algorithm, were applied to assuring the quality of the dissolved oxygen (DO) time series, a

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Langovic, Marko, and Vojislav Dedjanski. "Water Supply in the Republic of Serbia – State and Perspectives." Annals of Valahia University of Targoviste, Geographical Series 17, no. 1 (2017): 28–36. http://dx.doi.org/10.1515/avutgs-2017-0003.

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Abstract Water supply has pronounced priority, over other forms of water use. The term water supply includes the ensure of high quality water in general terms, for households, public needs and economic activities. The Republic of Serbia disposes with considerable underground and surface water resources, which are used for supplying, but it is required their rational utilization. The aim of this study is to show the current state of water supply on the territory of Serbia based on the analysis of the different indicators. One of the goal is to scan prevalent conditions and problems related to i

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Hu, Minqi, Ronghua Ma, Zhigang Cao, Junfeng Xiong, and Kun Xue. "Remote Estimation of Trophic State Index for Inland Waters Using Landsat-8 OLI Imagery." Remote Sensing 13, no. 10 (2021): 1988. http://dx.doi.org/10.3390/rs13101988.

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Remote monitoring of trophic state for inland waters is a hotspot of water quality studies worldwide. However, the complex optical properties of inland waters limit the potential of algorithms. This research aims to develop an algorithm to estimate the trophic state in inland waters. First, the turbid water index was applied for the determination of optical water types on each pixel, and water bodies are divided into two categories: algae-dominated water (Type I) and turbid water (Type II). The algal biomass index (ABI) was then established based on water classification to derive the trophic s

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Chugai, A. V., and О. V. Derevenska. "Estimation of pollution level of lake Yalpuh as an object of fishing purpose." Ukrainian hydrometeorological journal, no. 22 (December 3, 2018): 133–39. http://dx.doi.org/10.31481/uhmj.22.2018.13.

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The work offers estimation of Lake Yalpuh's water quality for a long period as a fishery object. The preliminary analysis of the dynamics of water quality indicators change showed that there was a decrease of concentrations of almost all quality indicators during the period of the study (2003 - 2017). According to the results of the estimation, the water quality of Lake Yalpuh in the top section was characterized by the "very dirty" category, the quality class was marked as IVc-IVd. Most often such indicators as dry residue, magnesium, chlorides, sulfates were taken as limiting indicator

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Kolisnyk, A. V. "Current situation of water quality Dniester River basin in transboundary areas." Ukrainian hydrometeorological journal, no. 16 (October 29, 2017): 202–8. http://dx.doi.org/10.31481/uhmj.16.2015.27.

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Introduction. Today there are significant problems of transboundary pollution of the Dniester River basin in Ukraine, including within the Vinnitska oblast. Purpose. The aim is to assess the current state of the watercourses of the Dniester River basin in transboundary areas with the Republic of Moldova, within the Vinnytska oblast by 2013. Methods. Evaluation of current watercourses quality in Dnister basin was performed based on the Methodology of environmental assessment of watercourses quality for the relevant category and on the Methods integrated assessment of groundwater con

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32

Kalach, A. D. "Assessing Water-Provision of Population in the System of Measures Aimed at Bottled Drinking Water Production." Vestnik of the Plekhanov Russian University of Economics, no. 2 (March 18, 2025): 118–28. https://doi.org/10.21686/2413-2829-2025-2-118-128.

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The article studies issues of providing the population with accessible drinking water of high quality. The author puts forward a new integral index to assess water-provision of people, which takes into account different factors, including accessibility of water resources, their quality, the level of water-supplying infrastructure and efficiency of water resource management. Integral index was elaborated with due regard to existing methods of water resource estimation, but it was extended and now it includes additional parameters that are specific for conditions in the Russian Federation. For e

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Shraddha, Vaishnav* Dr.Devyani Sharma Dr.Ashish Saraf. "ESTIMATION OF WATER QUALITY PHYSICOCHEMICAL AND BIOLOGICAL PARAMETER OF SHIVNATH RIVER IN DURG DISTRICT (CHHATTISGARH)." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 3 (2017): 288–93. https://doi.org/10.5281/zenodo.400941.

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Water is one of the most important components of living organism. Water quality of Shivnath River has become heavily polluted due to the disposal of Industrial effluents and several developmental activities. As research conducted by State Pollution Control Board, it is evident that human activities have contributed immensely in increasing the level of pollutants in the river. In the present study, samples from Durg District were analyzed for various parameters indicative of pollution level. Parameters like Physico-chemical properties like Temperature, Turbidity, colour, and Chemical property l

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Anthwal, Tushar, and M. K. Pandey. "Assessing State of the Art on Artificial Neural Network Paradigms for Level of Eutrophication Estimation of Water Bodies." IAES International Journal of Artificial Intelligence (IJ-AI) 5, no. 4 (2016): 135. http://dx.doi.org/10.11591/ijai.v5.i4.pp135-142.

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With growing power of computer and blend of intelligent soft wares, the interpretation and analytical capabilities of the system had shown an excellent growth, providing intelligence solutions to almost every computing problem. In this direction here we are trying to identify how different geocomputation techniques had been implemented for estimation of parameters on water bodies so as to identify the level of contamination leading to the different level of eutrophication. The main mission of this paper is to identify state-of-art in artificial neural network paradigms that are prevailing and

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Quiñones-Huatangari, Lenin, Luis Ochoa, Manuel Emilio Milla-Pino, José Federico Bazán, Oscar Andrés Gamarra, and Jesús Rascón. "Water quality index using fuzzy logic Utcubamba River, Peru." Revista de Ciencias Agrícolas 37, no. 1 (2020): 6–18. http://dx.doi.org/10.22267/rcia.203701.124.

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Water is a fundamental nutrient in the life of any living being. Therefore, it is necessary to estimate its quality, because it is an issue of increasing concern countries around the world for reasons such as the health of the population, regional, national and international economic development, and the environmental quality of the ecosystems. One tool that has been used to know the state of the water is the water quality indexes (WQI). The objective of this research was to develop a WQI based on fuzzy logic, which allows for the estimation of water quality in the Utcubamba River. The methodo

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Baik, Jongjin, Jongmin Park, and Minha Choi. "Estimation and Assessment of Total Phosphorus and Trophic State Index Estimated from Landsat 8 Dataset on 2018 at Daecheong Reservoir." Journal of Korean Society of Environmental Engineers 42, no. 9 (2020): 415–23. http://dx.doi.org/10.4491/ksee.2020.42.9.415.

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Objectives : Remote sensing of water quality parameters (WQPs) has been widely applied along with the emerging importance of obtaining the spatial pattern of water quality at inland reservoir. This study retrieved the Total Phosphorus (TP) via remote sensing imagery at Daecheong reservoir and used it for acquiring the spatial distribution of Trophic State Index (TSI).Methods : First, stepwise regression for TP was established using the ground-based TP measurement and reflectance of Landsat 8 collocated in space and time. With the developed regression model, we estimated the spatial distributio

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KAMIYAMA, Juichi, Syunya TOKUMARU, Shinya FUKUMOTO, et al. "Research on estimating state of water quality by Unmanned Surface Vehicle." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2020 (2020): 2P1—N15. http://dx.doi.org/10.1299/jsmermd.2020.2p1-n15.

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Somova, Yuliya, Elena Degodia, Elena Kasatkina, Aleksey Peryatinskiy, and Aleksandr Kudryashov. "Investigation of surface water quality in magnitogorsk industrial area for the environmental estimation of technogenic watercourse state." Eastern-European Journal of Enterprise Technologies 3, no. 10 (87) (2017): 74–81. http://dx.doi.org/10.15587/1729-4061.2017.102374.

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Kreklow, Jennifer, Bastian Steinhoff-Knopp, Klaus Friedrich, and Björn Tetzlaff. "Comparing Rainfall Erosivity Estimation Methods Using Weather Radar Data for the State of Hesse (Germany)." Water 12, no. 5 (2020): 1424. http://dx.doi.org/10.3390/w12051424.

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Rainfall erosivity exhibits a high spatiotemporal variability. Rain gauges are not capable of detecting small-scale erosive rainfall events comprehensively. Nonetheless, many operational instruments for assessing soil erosion risk, such as the erosion atlas used in the state of Hesse in Germany, are still based on spatially interpolated rain gauge data and regression equations derived in the 1980s to estimate rainfall erosivity. Radar-based quantitative precipitation estimates with high spatiotemporal resolution are capable of mapping erosive rainfall comprehensively. In this study, radar clim

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Rocha, Lucas Gonçalves, Karinnie Nascimento de Almeida, José Antonio Tosta dos Reis, Antonio Sergio Ferreira Mendonça, and Fernando das Graças Braga da Silva. "Sewage treatment efficiencies estimation for urban areas located in the River Pardo’s watershed by associating nonlinear programming and water quality modeling." Revista Brasileira de Ciências Ambientais (Online) 56, no. 1 (2020): 65–75. http://dx.doi.org/10.5327/z2176-947820200731.

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Estimating efficiencies required for sewage treatment plants within a river watershed, where there are usually multiple sewage discharges and water withdrawals points in watercourses, presenting different quality conditions and sewage assimilation capacities, is a complex task. In this context, combined optimization techniques and water quality modeling can be important tools to support sewage treatment efficiencies appropriation processes. In the present paper, QUAL-UFMG water quality model and Nonlinear Programming (NLP) are jointly applied to sewage treatment levels selection for the river

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Ashraf, M. M., M. Obaid Ullah, T. N. Malik, A. B. Waqas, M. Iqbal, and F. Siddiq. "A Hybrid Water Cycle Algorithm-Least Square based Framework for Robust Estimation of." Nucleus 55, no. 2 (2018): 47–60. https://doi.org/10.71330/thenucleus.2018.413.

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Â The power quality is becoming an extensively addressing aspect of power system because of sensitive operation of smart grid, awareness of power quality and modern power system equipment. This paper proposes a new hybrid framework of Water Cycle Algorithm-Least Square (WCA-LS) for estimation of harmonics present in time varying noisy power signals. Water Cycle Algorithm (WCA) is a population based algorithm which realizes the concepts of exploitation and exploration to find global optimal in search space under consideration. This algorithm exploits the concept of natural hydrologic cycle to p

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Nurfadillah, Nurfadillah, Irma Dewiyanti, Sri Riska Rahayu, Siswani Sari, Indri Karina, and Hasfiandi Hasfiandi. "Trophic status analysis and estimation of fish production in Aneuk Laot Lake aquatic resources management, Sabang City." Depik 11, no. 3 (2022): 469–75. http://dx.doi.org/10.13170/depik.11.3.27499.

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Aneuk Laot Lake is located in Sabang City, Weh Island, Aceh Province. Changes in water quality can affect the life of aquatic organisms found in Aneuk Laot Lake. The purpose of this research estimates fish production and trophic status for the aquatic resource management of Aneuk Laot Lake, Sabang. This research was conducted in September 2019 in Lake Aneuk Laot using the TRIX, TSI (Trophic State Index) and Nygaard index methods to determine fish production and trophic status. Observation stations were determined using stratified random sampling method and analysis of chlorophyll-a was done us

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Rodríguez-López, Lien, David Bustos Usta, Lisandra Bravo Alvarez, et al. "Machine Learning Algorithms for the Estimation of Water Quality Parameters in Lake Llanquihue in Southern Chile." Water 15, no. 11 (2023): 1994. http://dx.doi.org/10.3390/w15111994.

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The world’s water ecosystems have been affected by various human activities. Artificial intelligence techniques, especially machine learning, have become an important tool for predicting the water quality of inland aquatic ecosystems. As an excellent biological indicator, chlorophyll-a was studied to determine the state of water quality in Lake Llanquihue, located in southern Chile. A 31-year time series (1989 to 2020) of data collected in situ was used to determine the evolution of limnological parameters at eight spaced stations covering all of the main points of the lake, and the year, mont

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Sufyan, A., R. Akhwady, D. Mahabror, S. M. Permana, and R. Zulkarnain. "Analysis of Physical and Chemical Conditions in Sidakarya Coastal Waters, Bali." IOP Conference Series: Earth and Environmental Science 1118, no. 1 (2022): 012049. http://dx.doi.org/10.1088/1755-1315/1118/1/012049.

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Abstract Sidakarya Coast is one of the developing ecotourism and fisheries areas in Denpasar City, Bali Province. This area has ecotourism and fishery potential that needs to be maintained so that ecotourism and fishery activities that depend on this area can enjoy economic prosperity. Activities around the coast of Sidakarya, such as ecotourism, housing areas, traditional fisheries, and agriculture, have indirectly affected the quality of coastal waters. This research was one of the efforts to identify the physical and chemical parameters of the coastal waters, including, salinity, temperatur

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Капранов, С. В. "Methodology for estimating the state of non-centralized sources of drinking water supply in an emergency socio-economic situation." Vodosnabzhenie i sanitarnaia tehnika, no. 10 (October 15, 2021): 56–64. http://dx.doi.org/10.35776/vst.2021.10.06.

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Целью работы явилось обоснование необходимости организации и проведения на конкурсной основе благоустройства нецентрализованных водоисточников с использованием разработанной методики комплексной гигиенической и экологической оценки состояния нецентрализованных источников питьевого водоснабжения в условиях чрезвычайной ситуации. В работе использованы результаты многолетнего санитарно-гигиенического обследования и лабораторных исследований воды коллективных источников нецентрализованного питьевого водоснабжения. Определены следующие основные показатели для комплексной гигиенической и экологическ

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Sarmento Vieira, Allan, and Isabel Fontgalland. "Proposal of a Model for Water Usage: Revenue Estimation in Brazil Hydrographic Basin." Technium Sustainability 4 (November 4, 2023): 72–82. http://dx.doi.org/10.47577/sustainability.v4i.10133.

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In order to improve the quality of aquatic ecosystems, a water collection instrument was established in the National Water Resources Policy (PNRH), with the purpose of collecting and allocating resources to the management of water systems, as well as stimulating the conscious and efficient use of water, with the direct finality of reducing the rates of waste and pollution of water sources. This instrument guided the definition of the objective from the present research, which is to estimate the collection of the Pianco-Piranhas-Açu Basin, located between the State of Paraiba and Rio Grande do

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Pivato, Mattia, Luca Carniello, Daniele Pietro Viero, Chiara Soranzo, Andrea Defina, and Sonia Silvestri. "Remote Sensing for Optimal Estimation of Water Temperature Dynamics in Shallow Tidal Environments." Remote Sensing 12, no. 1 (2019): 51. http://dx.doi.org/10.3390/rs12010051.

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Given the increasing anthropogenic pressures on lagoons, estuaries, and lakes and considering the highly dynamic behavior of these systems, methods for the continuous and spatially distributed retrieval of water quality are becoming vital for their correct monitoring and management. Water temperature is certainly one of the most important drivers that influence the overall state of coastal systems. Traditionally, lake, estuarine, and lagoon temperatures are observed through point measurements carried out during field campaigns or through a network of sensors. However, sporadic measuring campai

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Krutys, Pawel, Zbigniew Gomolka, Boguslaw Twarog, and Ewa Zeslawska. "Synchronization of the vector state estimation methods with unmeasurable coordinates for intelligent water quality monitoring systems in the river." Journal of Hydrology 572 (May 2019): 352–63. http://dx.doi.org/10.1016/j.jhydrol.2019.02.038.

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Kang, Seongkyu, Sijung Choi, and Dongryul Lee. "Evaluation and Re-estimation of Instream Flow Considering the Water Quality and Aquatic Ecosystem of the Seomjingang River Watershed." Journal of the Korean Society of Hazard Mitigation 21, no. 6 (2021): 347–55. http://dx.doi.org/10.9798/kosham.2021.21.6.347.

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In this study, the appropriateness of the current publicly announced and managed instream flow in the Seomjingang River watershed was evaluated based on the water quantity, water quality, and state of the aquatic ecosystem. The stream flow was evaluated based on the observed water flow rate at the Gurye-gun (Songjeong-ri) station that is the main point of the Seomjingang River flow management and located at the lowest downstream of the main stream of the Seomjingang River. Another important reason for choosing this station was that observational data from before the construction of the major d

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Caviglione, João H. "Pedotransfer functions of soil water properties to estimate the S-index." Revista Brasileira de Engenharia Agrícola e Ambiental 22, no. 7 (2018): 465–70. http://dx.doi.org/10.1590/1807-1929/agriambi.v22n7p465-470.

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ABSTRACT One big challenge for soil science is to translate existing data into data that is needed. Pedotransfer functions have been proposed for this purpose and they can be point or parametric when estimating the water retention characteristics. Many indicators of soil physical quality have been proposed, including the S-Index proposed by Dexter. The objective of this study was to assess the use of pedotransfer functions for soil water retention to estimate the S-index under field conditions in the diversity of soils of the Paraná state. Soil samples were collected from 36 sites with texture

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