scholarly journals Research on wind-induced nutrient release in Yangshapao Reservoir, China

2019 ◽  
Vol 20 (2) ◽  
pp. 469-477
Author(s):  
Yu Bai ◽  
Jinhua Gao ◽  
Ying Zhang
Keyword(s):  
Water Quality ◽  
Shear Stress ◽  
Wind Speed ◽  
Nutrient Release ◽  
Urban Water ◽  
Bottom Shear Stress ◽  
Dissolved Phosphorus ◽  
Urban Water Use ◽  
Lakes And Reservoirs

Abstract Nutrient (total nitrogen (TN) and total phosphorus (TP)) are considered the major indicators to be impacted by wind speed in shallow lakes and reservoirs. As a reservoir situated in Jilin Province, China, Yangshapao Reservoir has been employed for irrigation and urban water use. After 2 years’ observation carried out on water quality and wind speed, it was found that the TN, NH4 and TP are significantly correlated with the bottom shear stress attributed to wind, whereas the dissolved phosphorus (DP) is not. Bottom shear stress is also noticeably associated with dissolved oxygen (DO), thus promoting nutrient release into the water body. In winter, ice can effectively inhibit the wind-induced shear stress, and the TP concentration is evidently lower than in the other seasons. This scenario should be considered in the management of the water quality of the lake and similar lakes.

Empirical relationships for monitoring water quality of lakes and reservoirs through multispectral images

2014 ◽  
Vol 7 (5) ◽  
pp. 1632-1641 ◽  
Author(s):  
Carolina Dona ◽  
Juan M. Sanchez ◽  
Vicente Caselles ◽  
Jose Antonio Dominguez ◽  
Antonio Camacho
Keyword(s):  
Water Quality ◽  
Multispectral Images ◽  
Empirical Relationships ◽  
Lakes And Reservoirs

scholarly journals Influence of the use and the land cover of the catchment in the water quality of the semiarid tropical reservoirs

2018 ◽  
Vol 7 (7) ◽  
pp. 389
Author(s):  
Herika Cavalcante ◽  
Patrícia Silva Cruz ◽  
Leandro Gomes Viana ◽  
Daniely De Lucena Silva ◽  
José Etham De Lucena Barbosa
Keyword(s):  
Water Quality ◽  
Supervised Classification ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Landsat 8 ◽  
Dissolved Phosphorus ◽  
Sparse Vegetation ◽  
Tropical Reservoirs

The aim of this study was to evaluate some parameters of water quality of semiarid reservoirs under different uses and occupation of the catchment’s soil. For this, the reservoirs Acauã and Boqueirão, belonging to the Paraíba do Norte river watershed and Middle and Upper course sub catchments, respectively, were studied. For this, water samples were collected in August, September and October 2016. From these samples, total and dissolved phosphorus, nitrate, nitrite, ammonia, chlorophyll, dissolved and suspended solids were analyzed. In addition, images of the Landsat 8 satellite were acquired for the calculation of the Normalized Difference Vegetation Index (NDVI), and for the supervised classification of the use and occupation of the sub catchments. Thus, it was observed that, in general, the Acauã reservoir presented values of phosphorus and nitrogen and solids larger than the Boqueirão reservoir, due to the greater urban area, even though it had a smaller total area of the basin. Both reservoirs presented low vegetation rates and high areas of sparse vegetation and exposed soil, increasing the propensity to soil erosion and the transport of nutrients from the basin to the reservoirs, making water quality worse or impossible.

scholarly journals Water quality of urban water bodies – a threat for amphibians?

2014 ◽  
Vol 19 ◽  
pp. 57
Author(s):  
Karolina A. Budzik ◽  
Krystian M. Budzik ◽  
Paulina Kukiełka ◽  
Anna Łaptaś ◽  
Ewa E. Bres
Keyword(s):  
Water Quality ◽  
Water Bodies ◽  
Urban Water

scholarly journals Understanding the Variability in Estimation of Water Quality of Lakes and Reservoirs

2020 ◽  
Vol 955 ◽  
pp. 012085
Author(s):  
Ramp Pal Singh ◽  
Vasudevan Mangottiri ◽  
Balaganesh Pandiyan
Keyword(s):  
Water Quality ◽  
Lakes And Reservoirs

Investigating water quality of an urban water body using ground and space observations

2021 ◽  
Author(s):  
Manish Kumar ◽  
Mukesh Kumar ◽  
Derrick Mario Denis ◽  
Om Prakash Verma ◽  
Lakhan Lal Mahato ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Body ◽  
Urban Water ◽  
Space Observations

scholarly journals Effects of Climate Change on Water Quality in the Jucar River Basin (Spain)

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2424
Author(s):  
Gabriel Gómez-Martínez ◽  
Lorena Galiano ◽  
Toni Rubio ◽  
Carlos Prado-López ◽  
Darío Redolat ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
River Basin ◽  
Water Supply Systems ◽  
Urban Water ◽  
Raw Water ◽  
Urban Water Supply ◽  
Water Treatments ◽  
Supply Systems

The Mediterranean region is a climate change hotspot, especially concerning issues of hydrological planning and urban water supply systems. In this context, the Jucar River Basin (Spain) presents an increase of frequency, intensity and duration of extreme meteorological phenomena, such as torrential rains, droughts or heat waves, which directly affect the quantity and quality of raw water available for drinking. This paper aims to analyze the effects of climate change on the raw water quality of the Jucar River Basin District, which mainly supplies the city of Valencia and its metropolitan area, in order to adapt drinking water treatments to new conditions and opportunities. For this purpose, we used observed data of water quality parameters from four stations and climate drivers from seven Earth system models of the latest Coupled Model Intercomparison Project—Phase 6. To model water quality (turbidity and conductivity) in the past and future scenarios, this study employs a backward stepwise regression taking into account daily values of mean temperature, maximum temperature, total rainfall and minimum and maximum relative humidity. Results showed that the model performance of the water quality simulation is more adequate for short moving-average windows (about 2–7 days) for turbidity and longer windows (about 30–60 days) for conductivity. Concerning the future scenarios, the most significant change was found in the projected increase of conductivity for the station of the Júcar river, between 4 and 11% by 2100, respectively, under the medium (SSP2–4.5) and pessimistic (SSP5–8.5) emission scenarios. The joint use of these types of management and monitoring tools may help the managers in charge of carrying out the different water treatments needed to apply a better plan to raw water and may help them identify future threats and investment needs to adapt the urban water supply systems to the changing conditions of raw water, such as turbidity or conductivity, as a consequence of climate change.

COMBINED EFFECT OF WIND SPEED AND COVERING IRRIGATION CANALS ON WATER QUALITY PARAMETERS

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Sherine Ahmed El Baradei ◽  
Mai Alsadeq
Keyword(s):  
Water Quality ◽  
Wind Speed ◽  
Considerable Effect ◽  
Quality Parameters ◽  
Combined Effect ◽  
Water Quality Parameters ◽  
Maximum Increase ◽  
Water Parameters

Wind has a considerable effect on many water quality parameters. Some of the parameters are directly affected by the wind, while others are influenced by other physical water parameters like the velocity, temperature. etc. that are affected by wind and hence transfer their effect to water quality parameters. As the wind has an effect on water quality parameters, also covering waterways has a great effect on the water quality of those covered waterways. This is because covering a waterway alters the concentrations of its water quality parameters. This research is concerned with studying the combined effect of wind and covering of canals on different water quality parameters. The main Sheikh Zayed canal of the New Valley project in Toshka governorate in Egypt is taken as case study. Water quality parameters studied are dissolved oxygen concentration (DO) and total dissolved solids (TDS). Mathematical model was developed in order to carry on the simulation. After simulating the effect of wind and covering on these two water quality parameters it was found that the studied water quality parameters concentrations increased as the wind is gradually increased. Thus, TDS and DO showed maximum increase with increased wind speed and with uncovered canal area. TDS showed the max increase; namely 16%.

SFAQUALI – fuzzy system for urban water quality assessment

2019 ◽  
Vol 14 (3) ◽  
pp. 625-632
Author(s):  
Juliana Tais Engelmann ◽  
Rejane Frozza ◽  
Adilson Ben da Costa ◽  
Rodrigo Augusto Klamt
Keyword(s):  
Water Quality ◽  
Water Quality Assessment ◽  
Residual Chlorine ◽  
Great Good ◽  
Urban Water ◽  
Urban Water Quality ◽  
Quality Classification ◽  
Apparent Color ◽  
Free Residual Chlorine

Abstract The objective of this study was to develop a system capable of evaluating the quality of the water consumed by an urban population using fuzzy logic. The set of factors to be analyzed were total coliforms, fluoride, free residual chlorine, turbidity, and apparent color. The factors selected as indicators of water quality and the system rules were modeled using the INFUZZY tool with help from specialists in this area, using a Great, Good, Acceptable or Inappropriate quality classification. 47 water quality analyses were applied. The results showed that 57.44% of the samples had a water quality classified as Great, 2.12% as Good, 2.12% as Acceptable, and 38.29% as Inappropriate. For each sample, results were in agreement with the evaluated parameters.

Sign in / Sign up

Export Citation Format

Share Document