International symposium on the effects of urbanization and industrialization on the hydrological regime and on water quality

1978 ◽  
Vol 23 (2) ◽  
pp. 231-233
Keyword(s):  
Water Quality ◽  
International Symposium ◽  
Hydrological Regime

scholarly journals Assessment of the Water Quality of Jatiluhur Reservoir, the Downstream of Citarum Cascade River, Using Selected Physico-Chemical Parameters

2014 ◽  
Vol 10 (1) ◽  
Author(s):  
Lieza Corsita ◽  
Arwin Arwin ◽  
Barti Setiani Muntalif ◽  
Indah Rachmatiah Salami
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Level ◽  
Hydrological Regime ◽  
Quality Parameters ◽  
Biological Data ◽  
Chemical Parameters ◽  
Stream Flows ◽  
Physico Chemical

Physico-chemistry and biological data were investigated  from  October 2010 until April 2011 of Jatiluhur reservoir. A total of six sampling stations were selected for this study. The discharge and hidrological data were obtained from Perum Jasa Tirta II Jatiluhur. The results showed that the hydrological regime in the reservoir Jatiluhur was affected by global phenomenon La Nina events in 2010 and early in 2011. Stream flows were determined during sampling to range from 78  to 482.5 m3/s. The water quality findings were as follows: pH (6.93-8.81), temperature (26.37-30.6°C), dissolved oxygen (0.733-5.2 mg/l), conductivity (2.45-233µmhos/cm), COD (7.36-96.9 mg/l), turbidity (4.063-65.6 NTU), total phosphate (0.002-0.324 mg/l), total nitrogen (0.99-5.96 mg/l), chlorophyl (2.237-43.37 mg/m3), visibility (30-160 cm). The eutrophication was pronounced at Jatiluhur reservoir. Canonical Correspendence Analysis found that some water quality parameters correlated positively with the discharge and the water level.

scholarly journals Change of Hydrological Regime and Water Quality Due to Reduced Wastewater Discharged into Surface Waters

2020 ◽  
Vol 29 (4) ◽  
pp. 2661-2668
Author(s):  
Věra Hubačíková ◽  
Jozefína Pokrývková ◽  
Jana Marková
Keyword(s):  
Water Quality ◽  
Surface Waters ◽  
Hydrological Regime

scholarly journals Phosphorus and thermotolerant coliforms’ loads in Brazilian watersheds with limited data: considerations on the integrated analysis of water quality and quantity

RBRH ◽  
2019 ◽  
Vol 24 ◽  
Author(s):  
Luis Otávio do Amaral Marques ◽  
Denise Taffarello ◽  
Maria do Carmo Calijuri ◽  
Eduardo Mario Mendiondo ◽  
Murilo de Souza Ferreira ◽  
...  
Keyword(s):  
Water Quality ◽  
Critical Loads ◽  
Hydrological Regime ◽  
Current Approach ◽  
Integrated Analysis ◽  
Total N ◽  
Qualitative And Quantitative ◽  
Quality Guidelines ◽  
Thermotolerant Coliforms ◽  
Water Quality And Quantity

ABSTRACT Integrated analyses of the qualitative and quantitative aspects of aquatic ecosystems play an important role in decision making, which is linked to water resources management and promotion of ecosystem services. However, the possible advantages of such integration are still hampered by basic aspects, such as high uncertainties due to the partial and non-synchronized monitoring of discharges and observed concentrations of water quality variables. The lack of data has been limiting the adequate representation of a more accurate hydrological regime, which is in turn possibly affected by the potential effects of land use and size of drainage areas. The aim of this research was to discuss the advantages of the integrated analysis of qualitative and quantitative data from water bodies. Under different specific discharge regimes (L.s -1.km-2), we assessed the total phosphorus (TP, t.day-1 .km-2) and thermotolerant coliforms’ (TC, CFU.day-1.km -2) specific loads in rivers with different drainage areas (27-26,500 km 2) and land uses. We compared such loads with the admissible specific loads for these variables, which were estimated based on long-term average discharges and water quality guidelines (i.e., Brazilian environmental standards). Based on data from 2001-2013, we sought to contribute to the qualitative and quantitative analysis of surface waters, focusing on the discussion of the results on critical thresholds of duration and critical loads and discharges. The results showed the existence of significant time intervals with conflicts between the specific admissible and observed loads. This non-compliance varied between 10 and 100% of the duration of the regime for TP, and between 25 and 100% for TC, with a more critical situation observed in rivers with smaller drainage areas. The critical loads ranged from 1 10-4 to 8 10-3 t.day-1.km-2 (TP) and 1 10-2 to 1 10-1 CFU.day-1.km-2 (TC). Although a relatively limited dataset was considered (total N=1,402), the significant variations in discharges and critical loads highlighted the need for considering how these dynamics would affect the traditional methodology for estimating ecological flows, whose current approach is almost exclusively quantitative.

Assessing the adequacy of SWAT model to simulate postfire effects on the watershed hydrological regime and water quality

2019 ◽  
Vol 31 (5) ◽  
pp. 619-631
Author(s):  
Marta Basso ◽  
Diana C.S. Vieira ◽  
Tiago B. Ramos ◽  
Marcos Mateus
Keyword(s):  
Water Quality ◽  
Swat Model ◽  
Hydrological Regime

scholarly journals Quality of Lake Ecosystems and its Role in the Spread of Invasive Species

2021 ◽  
Vol 25 (1) ◽  
pp. 676-687
Author(s):  
Oskars Purmalis ◽  
Laura Grīnberga ◽  
Linards Kļaviņš ◽  
Māris Kļaviņš
Keyword(s):  
Water Quality ◽  
Invasive Species ◽  
Hydrological Regime ◽  
Lake Management ◽  
Common Reed ◽  
Freshwater Ecosystems ◽  
Lake Water Quality ◽  
Lake Ecosystems ◽  
Management Measures

Abstract Lake ecosystems are important elements of hydrological regime, the quality of these ecosystems is affected by anthropogenic actions, and therefore, a variety of organisms, living in these habitats depend on the applied management solutions. Due to human activities freshwater ecosystems suffer from loss of biodiversity and increased eutrophication. Therefore, important aspects related to lake management include knowledge about the water quality, ecosystem response to climate change as well as increased risks of appearance and spreading of invasive species. Water quality, content of oxygen, nutrients, phytoplankton and distribution of macrophytes, including invasive species were analysed in Balvu and Pērkonu lakes. Presence of invasive species Canadian waterweed (Elodea canadensis) was detected, however, common reed (Phragmites australis) can be considered as expansive species. The analysis of current situation and existing management measures indicates persistent spreading of those species. Significant changes of lake water quality and climate may increase possible spreading of other, more aggressive, invasive species, for example – Nuttall’s waterweed (Elodea nuttallii).

scholarly journals Effects of Land Cover Changes on Sediment and Nutrient Balance in the Catchment with Cascade-Dammed Waters

2020 ◽  
Vol 12 (20) ◽  
pp. 3414
Author(s):  
Dawid Szatten ◽  
Michał Habel
Keyword(s):  
Water Quality ◽  
Land Cover ◽  
Catchment Area ◽  
Nutrient Balance ◽  
Water Environment ◽  
Hydrological Regime ◽  
Trapping Efficiency ◽  
Land Cover Changes ◽  
Matter Transport

It is commonly believed that changes in the use of the catchment area have a direct impact on the quality of the water environment. Rivers with dams and reservoirs are characterized by a disturbed outflow of sediments and nutrients from the catchment area. The research was based on indicating the variation in time and space of loads of selected parameters of the water quality of the Brda River (Northern Poland) against the land cover changes based on the CORINE Land Cover (CLC) data for the 1990–2018 period. In the lower part of the Brda catchment area, there are three hydropower dams with reservoirs in the form of a cascade, whose work clearly affects the hydrological regime of the river. The analysis of the dependence of the dynamics of water quality changes on the usage of CLC was based on indicators such as sediments (suspended sediment load) and nutrients (total phosphorus load and total nitrogen load). The use of hydrological data on the Brda discharge above and below the reservoirs made it possible to calculate sediment and nutrient trapping efficiency. Linking the CLC data with the indices responsible for the mechanical denudation of the catchment area made it possible to show the strength of changes taking place in the catchment area. The results of the research do not indicate any direct correlation between land cover changes and the dynamics of the denudation process and matter transport in the Brda catchment area. As our research shows, the strong influence on the hydrological regime of the catchment points out the necessity to search for still other research methods supporting the decision-making cycle in the field of water management in the face of climate change.

Spatial and Temporal Changes in Habitat Conditions in the Na'aman Stream Ecosystem, Israel

1993 ◽  
Vol 27 (7-8) ◽  
pp. 387-395
Author(s):  
Jean-Jacques Jennings ◽  
Avital Gasith
Keyword(s):  
Water Quality ◽  
Species Diversity ◽  
A Priori ◽  
Hydrological Regime ◽  
Late Summer ◽  
Polluted Water ◽  
Habitat Conditions ◽  
Stream Ecosystem ◽  
Lowland Streams ◽  
Coastal Streams

Nahal Na'aman is a small, shallow coastal stream in northern Israel. A three year study was conducted to examine the effect of habitat conditions on the biological structure and function of the stream ecosystem. Here we describe temporal and spatial changes in the water regime and water quality as measures of the stream's habitat conditions. Habitat condition is strongly influenced by the hydrological regime and the water quality. In dry years the water level drops and the upper section of the stream may dry up completely. Inflow of polluted water from various sources increasingly reduces water quality downstream. In general, the Na'aman may be categorized as oligo- to mesohaline stream, highly enriched with organic matter and nutrients. Sporadic pollution events markedly affect the water quality resulting in hypertrophic conditions, particularly at times of low stream levels. Low water quality was detected also in association with the drying and refilling of the stream's sections in late summer and in fall, respectively, and following runoff in winter. The oligohaine nature of the stream a priori reduces species diversity relative to other freshwater, lowland streams/Based on water quality conditions, highest species diversity may be expected in the spring area and the upper section of the stream. However, habitat conditions in this section are most unstable due to changes of the hydrological regime. This, in turn, is expected to further reduce species richness and diversity. The extreme conditions are expected to determine the limit for the development of plant and animal life in the stream. This study illustrates the inherent problems of the coastal streams of Israel, namely, diminishing natural flow which is often replaced by discharge of effluent or sewage. Rehabilitation of the Na'aman and other coastal streams demands a radical solution for these problems.

scholarly journals Variability effect of hydrological regime on river quality pattern and its uncertainties: case study of Zarjoob River in Iran

2021 ◽  
Author(s):  
Saman Ebrahimi ◽  
Mahdis Khorram
Keyword(s):  
Water Quality ◽  
River Water ◽  
Hydrological Regime ◽  
River Water Quality ◽  
Pollution Load ◽  
Quality Model ◽  
Discharge Data ◽  
Load Uncertainty ◽  
Climate Conditions

Abstract River water quality assessment, affected by pollution load, and river regime changes in various climate conditions, is an implementation that simplifies water resources management, and justifies terms for increases or decreases in human activities. The current paper aims to offer a water quality model of a river considering parametric, hydrologic, and pollution load uncertainty by using uncertainty indexes like Plevel, ARIL, and NUE. These indexes were used to analyze the influences of the model's parameters and the river's regime alternations on the results. A Qual2K model, calibrated with PSO algorithm, is presented and connected to GLUE algorithm to assess the model's uncertainties like effective input parameters on the modeled variations, headwater flow, and input pollutions. Zarjoob River, in the north of Iran, was chosen as the case study. The results illustrate that the interaction among parameters, hydrologic and pollutant discharge data should be considered in river water quality simulation. The presented methodology can analyze the influences of parametric uncertainty, parametric and hydrologic uncertainty, and pollution input load uncertainty according to any quantity of observations and the modeled results of any river.

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