scholarly journals MODELING OF WATER QUALITY CHANGE DUE TO RESUSPENSION OF BOTTOM SEDIMENTS IN A SHALLOW RESERVOIR

2002 ◽  
Vol 46 ◽  
pp. 1085-1090 ◽  
Author(s):  
Kunihiko AMANO ◽  
Yoshiya YASUDA ◽  
Hiroyuki SUZUKI
Keyword(s):  
Water Quality ◽  
Bottom Sediments ◽  
Quality Change ◽  
Shallow Reservoir ◽  
Water Quality Change

scholarly journals Water quality change and driving forces of Lake Hongze from 2012 to 2018

2021 ◽  
Vol 33 (3) ◽  
pp. 715-726
Author(s):  
Li Ying ◽  
◽  
Zhang Zhen ◽  
Cheng Jianhua ◽  
Zou Lianghua ◽  
...  
Keyword(s):  
Water Quality ◽  
Driving Forces ◽  
Quality Change ◽  
Water Quality Change

scholarly journals LUCC impact on water quality change in Xingyun Lake basin

2020 ◽  
Vol 198 ◽  
pp. 04025
Author(s):  
Xiaolun Zhang ◽  
Yanyan Shao
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Land Use ◽  
Lake Basin ◽  
Quality Change ◽  
Construction Land ◽  
Water Quality Change ◽  
Pollution Indicator ◽  
Bare Land ◽  
Xingyun Lake

Basin ecological environment and water quality are seriously threatened by development around the lake. The thesis intends to assess basin Land Use and land Cover Changes (here after abbreviated as LUCC) impact on water quality change in Xingyun Lake basin. To achieve this purpose, land use information was interpreted from six periods high-resolution images in the past 30 years, which were classified into seven land use types. The water quality data was obtained by investigation and collection. SPSS software was used to celebrate the correlation coefficient between water quality and LUCC. The results revealed that, in the study area construction land, transportation land and farm land were underwent an increase with the region development; grassland and bare land were gradually reduced, forest land had become fragmented. In addition, the water pollution index gradually increased since 2000, the water deteriorated significantly. Furthermore, there was a strong positive correlation between water pollution indicator and farmland, construction land and transportation land, which indicated that the deterioration of water quality may be the result of the combined effects of agriculture non-point source pollution, domestic and industrial pollution; there was a significant negative correlation between water pollution indicator and grassland and bare land, which indicated that permeable underlying mat had significant interception and absorption effects on pollutants.

scholarly journals Paleo‐indicators and water quality change in the Charlotte Harbor Estuary (Florida)

2006 ◽  
Vol 51 (1part2) ◽  
pp. 518-533 ◽  
Author(s):  
R. E. Turner ◽  
N. N. Rabalais ◽  
B. Fry ◽  
N. Atilla ◽  
C. S. Milan ◽  
...  
Keyword(s):  
Water Quality ◽  
Charlotte Harbor ◽  
Quality Change ◽  
Water Quality Change

scholarly journals Water quality change of rivers during rainy events in a watershed with different land uses in Southern Brazil

RBRH ◽  
2016 ◽  
Vol 21 (3) ◽  
pp. 514-524 ◽  
Author(s):  
Rubia Girardi ◽  
Adilson Pinheiro ◽  
Luis Hamilton Pospissil Garbossa ◽  
Édson Torres
Keyword(s):  
Water Quality ◽  
High Frequency ◽  
The Other ◽  
Ammonium Ion ◽  
Native Forest ◽  
Quality Change ◽  
Short Term ◽  
Temperature Conductivity ◽  
Nitrate Ion ◽  
Water Quality Change

ABSTRACT High frequency monitoring in environmental studies is increasingly being used due to the availability of equipment and quick response. With high frequency time series, it is possible to extract short-term responses during and after a rain event, which is not captured by conventional monitoring. The aim of this study is to evaluate the superficial water quality change of a stream in a preserved area in Atlantic Forest by short-term data (hour interval). The Cubatão do Sul watershed is located in the Central Coast region of the state of Santa Catarina in Brazil. Rain height and water quality parameters were monitored using rain gauge and multiparameter probes. Two fluviometric sections were also monitored — one in Vargem do Braço stream (FS1), which is mainly native forest (dense ombrophilous forest), and the other in Cubatão do Sul River (FS2), which is influenced by urban, agricultural and sand extraction uses. The temperature and nitrate ion permanency curve in FS1 showed slightly lower values during rainy events, but an opposite behavior was observed for turbidity. On the other hand, the permanency curves during rainy periods of FS2 presented lower conductivity and ammonium ion. When the dry and rainy periods were statistically compared, there was a significant difference for temperature, conductivity, pH, nitrate ion, turbidity and dissolved oxygen for FS1, and temperature, conductivity and turbidity for FS2. The water quality of the Cubatão do Sul watershed is influenced by stream flow and has a short-term time response considering the rain events. The oscillation of the monitored parameters between two periods, dry and rainy, is smaller in native forest than urban and rural land use.

A basic study on comprehensive water indices using glass fiber filters and a spectrophotometer

1996 ◽  
Vol 34 (7-8) ◽  
pp. 163-168
Author(s):  
Keigo Nakamura ◽  
Yukihiro Shimatani
Keyword(s):  
Water Quality ◽  
Glass Fiber ◽  
Quality Index ◽  
Point Of View ◽  
Absorbance Spectrum ◽  
Water Color ◽  
Quality Change ◽  
Basic Study ◽  
Water Quality Change ◽  
Water Indices

Chemical and biotic indices of water quality have some problems. They need a lot of time to measure and technology, therefore we considered evaluating water color objectively and quantitatively. This method is as follows; after filtering sampling water on the glass fiber filter, absorbance spectrum of this filter is measured by the spectrophotometer. This method does not need, technology and cost. We surveyed the relation between absorbance spectrum and conventional water indices. As a result, this method is very effective to evaluate water quality change from the water color point of view abd it can also evaluate turbidity and Chlorophyll-a very easily. We expect this method to lead to a new water quality index.

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