scholarly journals A GIS methodology to support sea water quality assessment in coastal areas

2018 ◽  
Vol 20 (1) ◽  
pp. 122-127 ◽  
Keyword(s):  
Water Quality ◽  
Statistical Analysis ◽  
Spatial Analysis ◽  
Sea Water ◽  
Rapid Development ◽  
Coastal Areas ◽  
Geographical Information ◽  
Multivariate Techniques ◽  
Analysis Methods ◽  
Wide Range

The development of methodologies for assessing water quality in coastal areas including mapping of eutrophication levels is a research area of high interest. A wide range of methodological approaches can be found in the literature, including multivariate techniques, since marine eutrophication is a multi-parametric phenomenon. In this context, statistical analysis and in particular Principal Component Analysis (PCA) have been widely applied. However, no attempt has been presented so far for mapping eutrophication levels based on information acquired from PCA results in integration with spatial analysis methods. The rapid development of Geographical Information Systems provides the appropriate framework for the development and application of methodologies integrating statistical analysis, spatial analysis methods and mapping techniques. This paper proposes such a methodological approach for assessing sea water quality in coastal areas. The methodology is clearly described and the Strait of Mytilene at the east of the Island of Lesvos in the NE Aegean Sea, Greece is used as a case study.

A geographic information system screening tool to tackle diffuse pollution through the use of sustainable drainage systems

2014 ◽  
Vol 69 (10) ◽  
pp. 2066-2073 ◽  
Author(s):  
Zorica Todorovic ◽  
Neil P. Breton
Keyword(s):  
Water Quality ◽  
Information System ◽  
Flood Management ◽  
Diffuse Pollution ◽  
Geographical Information ◽  
Drainage Systems ◽  
Wide Range ◽  
Diffuse Pollutant Sources ◽  
Traditional Approaches ◽  
Sustainable Drainage Systems

Sustainable drainage systems (SUDS) offer many benefits that traditional solutions do not. Traditional approaches are unable to offer a solution to problems of flood management and water quality. Holistic consideration of the wide range of benefits from SUDS can result in advantages such as improved flood resilience and water quality enhancement through consideration of diffuse pollution sources. Using a geographical information system (GIS) approach, diffuse pollutant sources and opportunities for SUDS are easily identified. Consideration of potential SUDS locations results in source, site and regional controls, leading to improved water quality (to meet Water Framework Directive targets). The paper will discuss two different applications of the tool, the first of which is where the pollutant of interest is known. In this case the outputs of the tool highlight and isolate the areas contributing the pollutants and suggest the adequate SUDS measures to meet the required criteria. The second application is where the tool identifies likely pollutants at a receiving location, and SUDS measures are proposed to reduce pollution with assessed efficiencies.

Identification of coastal water quality by statistical analysis methods in Daya Bay, South China Sea

2010 ◽  
Vol 60 (6) ◽  
pp. 852-860 ◽  
Author(s):  
Mei-Lin Wu ◽  
You-Shao Wang ◽  
Cui-Ci Sun ◽  
Haili Wang ◽  
Jun-De Dong ◽  
...  
Keyword(s):  
Water Quality ◽  
Statistical Analysis ◽  
South China Sea ◽  
Coastal Water ◽  
South China ◽  
Daya Bay ◽  
Coastal Water Quality ◽  
China Sea ◽  
Analysis Methods ◽  
Statistical Analysis Methods

scholarly journals Physical and Facilities Factors Influencing Tourist Distribution in Bantul Regency, Special Region of Yogyakarta

2018 ◽  
Vol 73 ◽  
pp. 03002
Author(s):  
Akhmad Shidiq Darajat ◽  
M. H. Dewi Susilowati
Keyword(s):  
Statistical Analysis ◽  
Spatial Analysis ◽  
Coastal Areas ◽  
Physical Factors ◽  
Chi Square ◽  
Significance Level ◽  
Factors Influencing ◽  
Percent Area ◽  
Special Region

Bantul Regency is one of favorite of tourism in Special Region of Yogyakarta. Bantul’s landscape are very different, more than half area is below 50 m and around 70 percent area consist agricultural lanscapes. Bantul Regency have many primary, secondary and conditional facilities, along accessibility. Variety of facilities cause differences number tourist. The objective of reseach was to analyze physical and facilities factors influencing tourist distribution. The method used are spatial and statistical analysis (chi-square). Based on spatial analysis shows: (1) physical factors are different, indicating flat on souther and plain on western; (2) the most facilities are placed at southern, especially Parangtritis Beach; (a) primary facilities covering most natural attractions in southern coastal areas and cultures in westhern with plain terrain; (b) the highest of secondary and conditional facilities are located at Parangtritis Beach;(d) highest accessibility is at Parangtritis Beach; (3) most tourist are placed at southern, especially Parangtritis Beach. Based on statistical analysis shows: (1) the influence of physical factors on distribution of number tourists is not significant at the significance level (α) = 0.05; (2) Correlation between number tourist and facilities is significant and indicate the value of correlation is 0.959.

scholarly journals SỬ DỤNG CÁC CHỈ SỐ ĐỂ ĐÁNH GIÁ CHẤT LƯỢNG NƯỚC VÀ PHÂN LOẠI MỨC ĐỘ PHÚ DƯỠNG CỦA VÙNG NƯỚC VEN BIỂN QUẢNG NINH - HẢI PHÒNG

2018 ◽  
Vol 17 (4) ◽  
pp. 490-497
Author(s):  
Le Van Nam ◽  
Duong Thanh Nghi ◽  
Le Thi Kim Ngan
Keyword(s):  
Economic Growth ◽  
Water Quality ◽  
Coastal Water ◽  
Water Body ◽  
Sea Water ◽  
Environmental Safety ◽  
Coastal Areas ◽  
Limit Values ◽  
Coastal Water Quality ◽  
Quang Ninh

With the fast economic growth and the loose management of pollutants discharged into the sea, the Quang Ninh - Hai Phong coastal water faces the risk of contamination of toxic subtances; and the eutrophication can occur. Therefore, coastal water quality was monitored at Tra Co, Cua Luc and Do Son in 2015. The results showed that sea water had the higher concentration of nitrate and 4.4’DDD compared to limit values. RQ coefficient of coastal areas was medium (0.25 < 0.562 < 0.75), hence “environmental safety”. According to the SWQI index, the water quality in three stations was good and not polluted. In terms of eutrophication level classification according to OECD (1982), the water body of all stations was mesotrophic. According to classification by TRIX index, only water body of Do Son station was in a state of eutrophication, that of the remaining stations was mesotrophic.

Bather Morbidity from Recreational Exposure to Sea Water

1993 ◽  
Vol 27 (3-4) ◽  
pp. 183-186 ◽  
Author(s):  
Y. E R. Von Schirnding ◽  
N. Strauss ◽  
P. Robertson ◽  
R. Kfir ◽  
B. Fattal ◽  
...  
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Sea Water ◽  
Statistical Significance ◽  
Quality Criteria ◽  
Coastal Areas ◽  
Water Quality Criteria ◽  
Western Cape ◽  
Potential Health ◽  
Health Related

Rapid urbanisation in the coastal areas of South Africa has led to increasing concern about the potential health effects on bathers resulting from exposure to contaminated seawater. Water quality criteria in South Africa are not epidemiologically derived; consequently a major programme has been launched to develop health-related criteria and policies pertaining to wastewater and stormwater management in the coastal areas of South Africa. In the first phase of the project, an epidemiological-microbiological study was carried out at a moderately polluted beach and a relatively clean beach, in the Western Cape. Individuals present at the beach in family groups were interviewed and follow-up telephone interviews were conducted 3-4 days after the beach outing. Water quality indicators measured on the same day as the beach interviews revealed significantly higher levels of enterococci and faecal coliforms at the moderately polluted beach. Symptom rates for gastrointestinal, respiratory and skin effects were substantially higher among swimmers relative to non-swimmers at the polluted beach, although they did not reach statistical significance.

scholarly journals Assessment of Groundwater Resources in Coastal Areas of Pakistan for Sustainable Water Quality Management Using Joint Geophysical and Geochemical Approach: A Case Study

2020 ◽  
Vol 12 (22) ◽  
pp. 9730 ◽  
Author(s):  
Muhammad Hasan ◽  
Yanjun Shang ◽  
Mohamed Metwaly ◽  
Weijun Jin ◽  
Majid Khan ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Management ◽  
Seawater Intrusion ◽  
Saltwater Intrusion ◽  
Water Quality Management ◽  
Coastal Areas ◽  
Silty Clay ◽  
Freshwater Resources ◽  
Saline Groundwater ◽  
Wide Range

Delineation of fresh/saline groundwater is essential for sustainable water quality management, especially in the coastal areas all around the globe. Seawater intrusion causes substantial degradation in quality of freshwater resources in the coastal areas. The main reason for saltwater intrusion is the changing environment in terms of sea-level rise, climate change, and over-extraction of freshwater resources to meet the growing demands. In this study, an integrated approach of geophysical and geochemical methods was used to assess saltwater intrusion in the coastal areas of Bela Plain, Pakistan. The inverted electrical resistivity computed from 50 vertical electrical sounding (VES) constrained the subsurface into five layers and two aquifers through 3D imaging, such as silty clay and sandy clay containing saline water, and sand, sandy gravel, and gravel containing freshwater. However, the narrow range of resistivity values shows an overlap of saline/fresh groundwater. Such ambiguity in the resistivity interpretation was removed by Dar-Zarrouk (D-Z) parameters. D-Z parameters, namely transverse unit resistance (Tr), longitudinal unit conductance (Sc), and longitudinal resistivity (ρL) estimated from VES, marked a clear distinction between saline and fresh aquifers with a wide range of values. The geochemical method was performed using 20 water samples for the main cations (K+, Ca2+ Na+, and Mg2+), anions (SO42−, HCO3−, Cl−, and NO3−), and other parameters (TDS, EC, and pH). Fresh/saline aquifers revealed by D-Z parameters are in good agreement with those delineated by physicochemical parameters and local hydrogeological conditions. This study delineates seawater intrusion of about 13–42 km from Sonmiani Bay in the Arabian Sea towards the inlands of Bela Plain. Therefore, it is expected that this investigation will be helpful in future planning for the management and exploitation of freshwater resources in the study area. Our study suggests that D-Z parameters can be used as the most inexpensive alternative to the traditional geotechnical and environmental tests for the demarcation of fresh/saline groundwater with a large coverage in any coastal or contaminated area under a homogeneous or heterogeneous setting.

scholarly journals The first step of application of water quality index (WQI) to assessment of sea water quality in the Gulf of Tonkin in 2018

2021 ◽  
Vol 20 (4B) ◽  
pp. 171-181
Author(s):  
Le Van Nam ◽  
Tran Duc Thanh ◽  
Nguyen Van Thao ◽  
Dang Hoai Nhon ◽  
Le Xuan Sinh ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Sea Water ◽  
Coastal Areas ◽  
Island Area ◽  
Poor Water Quality ◽  
Calculation Results ◽  
Gulf Of Tonkin ◽  
Average Water

The study to calculate the water quality index was conducted in the Gulf of Tonkin at the surface water in August 2018. The calculation results showed that out of 48 surveyed points, there was 1 point in the Northeast area at poor water quality, 15 points in the Northeast and coastal areas from Thanh Hoa to Thua Thien Hue at medium water quality, 14 points in the Gulf of Tonkin, Northeast and Con Co Island at good water quality, the remaining 18 points in the Gulf of Tonkin and Bach Long Vi Island at excellent water quality. Overall, the average water quality of the whole region was good (average WQI = 79). Considering each area, the Gulf of Tonkin area had good and excellent water quality, the Northeast had water quality from poor to good level, the coastal areas from Thanh Hoa to Thua Thien Hue had medium water quality, Con Co Island area had good water quality, Bach Long Vi Island area had excellent water quality.

scholarly journals The Use of Geoinformatics in Coastal Atmospheric Transport Phenomena: The Athens Experiment

2021 ◽  
Vol 9 (11) ◽  
pp. 1197
Author(s):  
Theodoros Nitis ◽  
Nicolas Moussiopoulos
Keyword(s):  
Wind Speed ◽  
Wind Direction ◽  
Geographical Information Systems ◽  
Atmospheric Transport ◽  
Transport Phenomena ◽  
Coastal Areas ◽  
Geographical Information ◽  
Meteorological Model ◽  
Coastal Meteorology ◽  
Wide Range

Coastal environment, an area where abrupt changes occur between land and sea, significantly affects the quality of life of a high portion of the Earth’s population. Therefore, the wide range of phenomena observed in coastal areas need to be assessed reliably regarding both data sets and methods applied. In particular, the study of coastal atmospheric transport phenomena which affect a variety of activities in coastal areas, using modeling techniques, demand accurate estimations of a range of meteorological and climatological variables related to the planetary boundary layer. However, the accuracy of such estimations is not obvious. Geoinformatics is able to fill this gap and provide the framework for the design, processing and implementation of accurate geo-databases. This paper aims to highlight the role of geoinformatics in the context of coastal meteorology and climatology. More precisely, it aims to reveal the effect on the performance of a Mesoscale Meteorological Model when a new scheme regarding the input surface parameters is developed using satellite data and application of Geographical Information Systems. The development of the proposed scheme is described and evaluated using the coastal Metropolitan Area of Athens, Greece as a case study. The results indicate a general improvement in the model performance based on the statistical evaluations of three meteorological parameters (temperature, wind speed and wind direction) using four appropriate indicators. The best performance was observed for temperature, then for wind direction and finally for wind speed. The necessity of the proposed new scheme is further discussed.

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