NOPR Collection:

An economic analysis of fisheries sector of Balochistan, Pakistan: current status and future potential

Sat, 01 Sep 2018 00:00:00 GMT

Title: An economic analysis of fisheries sector of Balochistan, Pakistan: current status and future potential Authors: Noman, Muhammad; Mu, Yong Tong; Mohsin, Muhammad; Mehak, Ana Abstract: The contribution of marine capture fisheries production from Baluchistan is almost 34% of total fisheries production in Pakistan. Nevertheless, little attention has been paid from provincial and federal governments, which lead to severe constraints in the development of Balochistan fisheries sector. Immediate steps such as control of over-fishing, revision of existing policies, assessment of stock status, better monitoring and surveillance and improvement of existing infrastructure are required for the betterment of this sector in the region. This study also highlights that future investment opportunities are still present in this sector, which may grab the attention of private stakeholders. Page(s): 1727-1734

Finfish diversity of trawl landings at Pamban therkuvady in south-east coast of India

Sat, 01 Sep 2018 00:00:00 GMT

Title: Finfish diversity of trawl landings at Pamban therkuvady in south-east coast of India Authors: Varghese, Molly; Mini, K. G. Abstract: The present research provides detailed information on the yearwise distributional patterns of fishes landed by trawl at Pamban therkuvady based on fortnightly samplings from September 2007 to April 2012. A total of 244 species belonging to 75 families under 18 orders were recorded. Quantitatively, Karalla dussumieri and family Leiognathidae dominated while by number of species, the family Carangidae contributed maximum with 20 species. The fish landing were the maximum during 2011-12 and was the minimum during 2008-09. Biodiversity studies were made using PRIMER 6 software. Different indices of conventional diversity as well as that of taxonomic distinctness based on dominance plot, dendrogram and funnel plots of delta+ and lambda+ are presented and discussed. Page(s): 1735-1741

Identification of shallow water flow using multicomponent seismic and GPR attributes in the deepwater basin of the northern South China Sea

Sat, 01 Sep 2018 00:00:00 GMT

Title: Identification of shallow water flow using multicomponent seismic and GPR attributes in the deepwater basin of the northern South China Sea Authors: Shen, Yupeng; Tang, Tianxiao; Zuo, Ruifang; Zhang, Zhe; Wang, Yaqiong Abstract: China has been using large-scale ocean bottom cable (OBC) multicomponent seismic data in deepwater oil and gas exploration since May 2012. In the northern South China Sea, shallow-water flows and over-pressurized zones are major hazards in deepwater drilling projects. Thus, the accurate predrill seismic prediction of shallow-water flow sands is an important practical problem. In this paper, the exact velocity field of sound in deep water is calculated as a function of the density, temperature and pressure of the seawater. Models of various elastic parameters are established. Through drilling data and simulation of the full wave field, new Pp and Ps AVO phenomena of shallow-water flow at various effective pressures are developed. Methods based on multicomponent seismic attributes, such as weighted average frequency and sweetness, are established to predict and characterize shallow-water flow. By studying vertically oriented GPR signals and signals parallel to the well paths in the SWF region, we find a significantly increased polarity inversion and decreased amplitude in the SWF region as effective pressure increases. Methods based on multicomponent seismic attributes and characteristics of the GPR signals may aid in the identification of SWF in the deepwater basin of the northern South China Sea. This may help overcome limitations to research in this area. Page(s): 1742-1748

Spatial and seasonal variation of groundwater levels in Vattamalaikarai River basin, Tamil Nadu, India - A study using GIS and GPS

Sat, 01 Sep 2018 00:00:00 GMT

Title: Spatial and seasonal variation of groundwater levels in Vattamalaikarai River basin, Tamil Nadu, India - A study using GIS and GPS Authors: Arya, S.; Vennila, G.; Subramani, T. Abstract: Groundwater is the major source of water in Vattamalaikarai River basin, Tamil Nadu, India for meeting the demand of the population for drinking and agriculture activities throughout the year. The basin occupies an area of 436.5 Km². Detailed field investigation was carried out in the basin during November 2011 for understanding the spatial and seasonal behavior of groundwater fluctuation. Groundwater levels were measured at 70 well locations with the help of water level recorder. GPS was used to find out the geographical coordinates and altitude of the wells with respect to the mean sea level. Hydrographs were prepared to understand the long-term groundwater fluctuation in various types of soils. It was observed that recharge rate was low in black cotton soil and high in alluvial soil. It was further observed that there was a quick response of water level to rainfall in red soil whereas the response was moderate to poor in calcareous soil. The minimum, maximum and average annual groundwater level fluctuations have been computed and plotted based on 21 years water level data and field observations. Groundwater flow directions were predicted using GIS based on the differences in groundwater head at various well locations. Spatial and seasonal groundwater level fluctuations were also plotted using GIS. Three dimensional water table elevation model was also prepared using GIS based on the groundwater levels in wells and topography of the basin. Page(s): 1749-1753