scholarly journals INVESTIGASI KANDUNGAN RADIOISOTOP DALAM SAMPEL BATUAN DI MUARA SUNGAI SUMLILI KUPANG BARAT

2020 ◽  
Vol 5 (1) ◽  
pp. 11-18
Author(s):  
Yosefina Molo ◽  
Bartholomeus Pasangka ◽  
Jehunias Leonidas Tanesib
Keyword(s):  
Three Dimensional ◽  
River Estuary ◽  
River Mouth ◽  
Field Research ◽  
Survey Sampling ◽  
Nuclear Radiation ◽  
Mineral Deposits ◽  
Counting Range ◽  
Mass Activity ◽  
Mass Type

Abstrak Masalah pokok yang dikaji di penelitian ini adalah pemetaan dan analisis aktivitas jenis kandungan radioisotop dalam sampel batuan di muara sungai Sumlili Kupang Barat. Tujuan penelitian meliputi : menentukanrange cacah dan aktivitas jenis massa (C) kandungan radioisotop dalam sampel pasir  di muara sungai Sumlili Kupang Barat, mengestimasi tingkat kontaminasi radioisotop sesuai standar di sekitar muara sungai Sumlili, dan memetakan sebaran cacah radioisotop pada luasan daerah tertentu yang terjangkau survei di lapangan. Metode penelitian meliputi : observasi/survei, sampling, serta analisis dan interpretasi data. Kisaran cacah radiasi di lapangan, di laboratorium, dan nilai aktivitas jenis massa kandungan radioisotop dalam 52 sampel pasir dari lokasi penelitian dimuara sungai Sumili Kupang Barat secara berturut-turut adalah 19 cpm sampai dengan 60 cpm, 29 cpm sampai dengan 73 cpm, dan  0,107 x 10-5μCi/gram sampai dengan 0,269 x 10-5μCi/gram. Berdasarkan kontur dan kurva tiga dimensi radiasi cacah radioisotop dalam sampel pasir di lapangan dan di laboratorium serta kontur dan kurva tiga dimensi aktivitas jenis massa di muara sungai Sumlili Kupang Barat dapat diketahui bahwa sebaran kontaminasi radioisotop di muara sungai Sumlili Kupang Barat  lebih tinggi ke arah barat dan cenderung menurun ke arah timur. Hasil perhitungan aktivitas jenis massa kandungan radioisotop dalam sampel pasir di muara sungai Sumlili Kupang Barat, termaksud dalam kontaminasi rendah untuk radiasi alpha (α) dan beta (β), namun daerah ini perlu diwaspadai karna terdapat beberapa titik di lapangan, cacah radiasi nuklir kandungan radioisotop dalam deposit mineral cukup tinggi melebihi standar IAEA. Kata kunci : Radioisotop, Aktivitas Jenis Massa, Daerah Kontaminasi. ABSTRACT The main problem studied in this study is mapping and analyzing the activity of the types of radioisotope content in rock samples at the mouth of the Sumlili river in West Kupang. The research objectives included: determining the counting range and mass type activity (C) radioisotope content in the sand samples at the Sumlili River mouth in West Kupang, estimating the level of radioisotope contamination according to the standards around the Sumlili river estuary, and mapping the distribution of radioisotope counts in the area covered by surveys in field. Research methods include: observation / survey, sampling, and analysis and interpretation of data. The range of radiation counts in the field, in the laboratory, and the value of the type of mass activity of radioisotope content in 52 sand samples from the study locations in the West Kupang Sumili River are 19 cpm to 60 cpm, 29 cpm to 73 cpm, and 0.107 x 10-5μCi / gram up to 0.269 x 10-5μCi / gram. Based on the three-dimensional contour and curve of radiation from radioisotope counts in sand samples in the field and in the laboratory and three-dimensional contours and curves the activity of mass types in the Sumlili estuary of West Kupang can be seen that the distribution of radioisotope contamination in the Sumlili estuary of West Kupang is higher west and tends to decline to the east. The results of the calculation of the type of mass activity of radioisotope content in sand samples at the mouth of the Sumlili River in West Kupang, are referred to in low contamination for alpha (α) and beta (β) radiation, but this area needs to be watched out for there are several points in the field, nuclear radiation in mineral deposits quite high exceeding IAEA standards. Keywords : Radioisotopes, Mass Type Activities, Contamination Areas.

scholarly journals Guarantee rate of freshwater in a river mouth intruded by saltwater with respect to the joint impact of runoff and tide

2015 ◽  
Vol 17 (6) ◽  
pp. 917-929 ◽  
Author(s):  
Jijian Lian ◽  
Wei He ◽  
Chao Ma ◽  
Kui Xu
Keyword(s):  
Numerical Model ◽  
Water Intake ◽  
Saltwater Intrusion ◽  
Three Dimensional ◽  
River Estuary ◽  
River Mouth ◽  
Level Line ◽  
Level Lines ◽  
Tide Level ◽  
Guarantee Rate

Saltwater intrusion is detrimental to water utilization. It is of vital significance to study the joint impact of runoff and tide on salinity and the risk of saltwater intrusion. To analyze the risk of saltwater intrusion, this paper proposes two concepts: critical runoff–tide level line and guarantee rate of freshwater. Taking Nandu River Estuary in China as a study case, a three-dimensional (3-D) hydrodynamic and salinity numerical model is built. Critical runoff–tide level lines are obtained to determine the occurrence of saltwater intrusion. To quantify the guarantee rates of freshwater, copula joint distribution is utilized, which connects the numerical model and daily hydrological characteristics. Guarantee rates of freshwater are obtained under different amounts of water intake (0, 10 m3/s, 20 m3/s, 30 m3/s). In addition, critical locations of water intake that satisfy different guarantee rates (80%, 85%, 90%, 95%, 99%) are identified. All the results will provide technical support for risk evaluation of saltwater intrusion and decisions on water intake location.

The salinity responses of tropical estuaries to changes in freshwater discharge, tidal mixing and geomorphology: case study of the man-affected Senegal River Estuary (West Africa)

2014 ◽  
Vol 65 (11) ◽  
pp. 987 ◽  
Author(s):  
C. Chevalier ◽  
M. Pagano ◽  
D. Corbin ◽  
R. Arfi
Keyword(s):  
Three Dimensional ◽  
River Estuary ◽  
River Mouth ◽  
Field Measurements ◽  
Human Action ◽  
Temporal Variations ◽  
Freshwater Inflow ◽  
Tidal Mixing ◽  
Senegal River ◽  
Large Populations

Salinity in estuaries is influenced by a variety of processes including tidal advection and diffusion and river discharge. The effect of hydrodynamic features on salinity was studied in the Senegal River Estuary (SRE). This estuary is of strategic importance for large populations, but it has been greatly affected by human action (regulation of the freshwater inflow, change in the location of the river mouth ...), which has caused major changes in salinity and ecological functioning. To analyse the impacts of these changes and to determine the spatial and temporal variations in salinity in the SRE, we used a combination of three-dimensional modelling and field measurements. The overall salinity depends on freshwater inflow and tidal fluctuations. Salinity variation is mainly driven by ebb and flood near the mouth and by fortnightly cycles upstream. The enlargement of the mouth increases salinity, whereas its shifting location changes the location of the salinity front and creates a slack water zone downstream. Connection and disconnection of the tributaries also affects the salinity. The present study explains how the recent modifications have increased spatial variation and reduced seasonal differences of salinity and provides a tool for managing the water in the estuary.

Động lực phát triển vùng cửa Sông Hậu (cửa Định An - Tranh Đề)

2008 ◽  
Vol 30 (2) ◽  
pp. 130-135
Author(s):  
Hoa Mạnh Hùng ◽  
Nguyễn Quang Thành ◽  
Phan Thị Thanh Hằng
Keyword(s):  
River Estuary ◽  
River Mouth

Evaluating the dynamics of the Hau River estuary (Dinh An - Tranh De river mouth)

A Real-Time Mathematical Model for Three-Dimensional Tidal Flow and Water Quality

1991 ◽  
Vol 24 (6) ◽  
pp. 171-177 ◽  
Author(s):  
Zeng Fantang ◽  
Xu Zhencheng ◽  
Chen Xiancheng
Keyword(s):  
Mathematical Model ◽  
Water Quality ◽  
Real Time ◽  
Control Volume ◽  
Tidal Flow ◽  
Three Dimensional ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Practical Application ◽  
The Pearl River

A real-time mathematical model for three-dimensional tidal flow and water quality is presented in this paper. A control-volume-based difference method and a “power interpolation distribution” advocated by Patankar (1984) have been employed, and a concept of “separating the top-layer water” has been developed to solve the movable boundary problem. The model is unconditionally stable and convergent. Practical application of the model is illustrated by an example for the Pearl River Estuary.

scholarly journals From east to west, can feminist legal strategies be transformative? Post-disaster to everyday times of crisis

2019 ◽  
Vol 10 (2) ◽  
pp. 247-268
Author(s):  
Jane Krishnadas
Keyword(s):  
Three Dimensional ◽  
Field Research ◽  
Community Relations ◽  
Access To Justice ◽  
The West ◽  
Legal Subject ◽  
Agents Of Change ◽  
Legal Strategies ◽  
The Uk ◽  
Post Disaster

AbstractThis article engages with a key question raised by feminist legal scholars from the east to the west: whether women should or should not engage in rights strategies? Are rights systematically exercised to reproduce patriarchal, dominant sites of justice, or do rights constitute a multiple and relational force which may transform sites of justice? The experience of women’s engagements with law in South Asia has created a diversity of critical legal knowledge and scholarship reflecting the pluralism of both women’s identities and needs based on caste, religion, class and sexuality across an array of legal spaces from the family, community and state. Women in South Asian scholarship have complicated the notion of the homogenous legal subject and the static dominant site of justice. In this article I return to my underpinning field research whilst living and working within an earthquake affected area of Maharashtra, India in the post-crisis rehabilitation period (1993–1998). This research explored how women exercised their rights to reconstruct lives at different tiers of justice: in public policy, private legislation and the non-formal sphere of community relations to deconstruct the concept of rights existing within a static framework of justice. Drawing upon feminist discourse across the east to the west, I have analysed the role of rights in post-disaster sites to understand how women move from victims to survivors, beneficiaries to contributors and objects to agents of change to inform contemporary research on how women in post-domestic violence situations may exercise rights to reconstruct their lives in times of crisis in the UK. Through this analysis I argue that rights may be empowering if one can exercise one’s right to identity as agency, resources as capacity and location as mobility, as a three dimensional strategy to transform the framework in which one is situated. Over the last decade, I have actively applied this transformative methodology to create an alternative relational, intersectional and holistic legal paradigm, to transform sites of justice, in times of every day crisis, through the CLOCK/ All India Access to Justice Strategy.

scholarly journals Tidal current energy potential of Nalón river estuary assessment using a high precision flow model

2018 ◽  
Vol 8 (1) ◽  
pp. 118-123
Author(s):  
Nicolás Badano ◽  
Rodolfo Espina Valdés ◽  
Eduardo Álvarez Álvarez
Keyword(s):  
High Precision ◽  
Hydrodynamic Model ◽  
Tidal Current ◽  
Flow Model ◽  
River Estuary ◽  
River Mouth ◽  
Hydrodynamic Models ◽  
Energy Potential ◽  
Tidal Current Energy ◽  
Current Energy

Abstract Obtaining energy from tide currents in onshore locations is of great interest due to the proximity to the points of consumption. This opens the door to the feasibility of new installations based on hydrokinetic microturbines even in zones of moderate speed. In this context, the accuracy of energy predictions based on hydrodynamic models is of paramount importance. This research presents a high precision methodology based on a multidimensional hydrodynamic model that is used to study the energetic potential in estuaries. Moreover, it is able to estimate the flow variations caused by microturbine installations. The paper also shows the results obtained from the application of the methodology in a study of the Nalón river mouth (Asturias, Spain).

scholarly journals Development of a GIS for managing dynamic, 3D coastal information of Pearl River Estuary

2007 ◽  
Vol 9 (3) ◽  
pp. 215-232 ◽  
Author(s):  
S. M. Y. Ng ◽  
O. W. H. Wai ◽  
Y. S. Li ◽  
Z. H. Xu ◽  
H. L. Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Three Dimensional ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Quality Data ◽  
Pearl River ◽  
Water Quality Data ◽  
Efficient Retrieval ◽  
Marine Data ◽  
Rigorous Model

A geographic information system (GIS) was developed for retrieval and display of hydrodynamic and water quality data. To establish such a system, two of the most important challenges are: (1) to establish a rigorous model which captures the three-dimensional and continuously changing characteristics of marine data and (2) to develop interpolation techniques to accommodate for the temporally and spatially scattered distribution of collected data. The developed system not only bridges together a GIS and a database of various physical, chemical and biological geographically based data for efficient retrieval and management of information, but also incorporates advanced display tools designed specifically for marine data. The initial intention of extending GIS for marine application is to mitigate the deteriorating water quality situation in the Pearl River Estuary (PRE).

Evaluation of the Status of Copper Contamination of Surface Sediments of Jen-Gen River Estuary, Taiwan

2013 ◽  
Vol 300-301 ◽  
pp. 1381-1384
Author(s):  
Cheng Di Dong ◽  
Yao Ting Tu ◽  
Chiu Wen Chen ◽  
Chih Ming Kao ◽  
Chih Feng Chen
Keyword(s):  
Municipal Wastewater ◽  
Surface Sediments ◽  
Biological Effects ◽  
Sediment Quality ◽  
River Estuary ◽  
River Mouth ◽  
Moderate Degree ◽  
River Bank ◽  
Biological Damage ◽  
Severe Degree

Major objectives of this study are to evaluation the enrichment, accumulation, and potential biological effects of copper (Cu) in the surface sediments of Jen-Gen River estuary, Taiwan. Eleven sampling locations were installed near the mouth of Jen-Gen River to collect sediment samples for analyzing Cu. Results of laboratory analyses show that concentrations of Cu in the sediments are between 67 and 278 mg/kg with an average of 181±61 mg/kg. The spatial distribution of Cu reveals that the Cu concentration is relatively high in the boundary of the river estuary. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of pollution. Results from the enrichment factor (EF) analysis imply that the sediments can be characterized as minor to moderately severe degree of Cu enrichment. Results of geo-accumulation index (Igeo) analysis indicate that the sediments can be characterized as none to moderate degree of Cu accumulation. Base on the comparison with sediment quality guidelines (SQGs), the concentrations of Cu in Jen-Gen River mouth sediments may cause acute biological damage.

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