scholarly journals Wave Modeling for the Establishment Potential Area of Offshore Aquaculture in Indonesia

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 229
Author(s):  
Muhammad Zikra ◽  
Haryo Dwito Armono ◽  
Fahrizal Pratama
Keyword(s):  
Environmental Parameters ◽  
Wave Model ◽  
Human Consumption ◽  
Total Production ◽  
Sustainable Aquaculture ◽  
Wave Modeling ◽  
Establishment Potential ◽  
Offshore Aquaculture ◽  
Potential Area ◽  
Suitable Location

Aquaculture is expected to further improve in the future and can provide 57 percent of fish for human consumption by 2025. In Indonesia, the aquaculture sector produced 5.77% of the world total production in 2014 and increases annually by, on average, 0.62%. Prigi Bay, located in the south of east Java, is one potential area to develop sustainable aquaculture in Indonesia. This study presents numerical wave modeling to investigate the potential area for offshore aquaculture in Prigi Bay. The method used Delft3D Flow and CG WAVE model to simulate wave and current. The superimposed analysis is used to select potential areas between the results of the model and the criteria of environmental parameters. The result shows that the location which meets the aquaculture criteria is located at coordinates 8.311° S–8.322° S and 111.734° E–111.747° E. This site has a depth of around 18–26 m with current velocity between 0.10 and 0.14 m/s and significant a wave height between 0.2–0.4 m. This location is the most suitable location for aquaculture in the Prigi Bay.

scholarly journals Wave Power Assessment in the Middle Part of the Southern Coast of Java Island

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2633
Author(s):  
Addy Wahyudie ◽  
Tri Bagus Susilo ◽  
Fatima Alaryani ◽  
Cuk Supriyadi Ali Nandar ◽  
Mohammed Abdi Jama ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Wave Energy ◽  
Significant Wave Height ◽  
Middle Part ◽  
Wave Power ◽  
Southern Coast ◽  
Power Intensity ◽  
Wave Energy Converters ◽  
Potential Area ◽  
Suitable Location

An assessment of the wave power at the southern coast of the middle part of Java Island (Indonesia) was conducted based on a 15-year hindcast spectral wave model using the MIKE 21 Spectral Wave software. The model was forced with wind data with a 0.125° spatial interval and hourly time resolution. The obtained model was validated with field data collected from a buoy station that provided a set of significant wave height data with an hourly data interval for the whole month of June 2014. The validation showed that the obtained model matched the observed data with a minor average error. A spatial analysis was conducted in order to find the most suitable location for installing wave energy converters while taking into consideration the potential area demand, the wave power intensity, and the distance from the shore. Moreover, spatial analysis is conducted in order to find a suitable location to install wave energy converters, with consideration to potential area demand, wave power intensity, and distance from the shore. The best prospective location reached 30 kW/m of mean wave power intensity, 2.04 m of mean significant wave height, 8.9 s of mean wave period, 150 m of distance from the shoreline.

scholarly journals Bioaccumulation and health risk assessment of trace elements in Mytilus galloprovincialis as sea food in the Al Hoceima coasts (Morocco)

2021 ◽  
Vol 240 ◽  
pp. 01002
Author(s):  
Ghizlane Azizi ◽  
Mostafa Layachi ◽  
Mustapha Akodad ◽  
Antonio Ignacio Martín-García ◽  
David R. Yáñez-Ruiz ◽  
...  
Keyword(s):  
Trace Elements ◽  
Mytilus Galloprovincialis ◽  
Physiological State ◽  
Environmental Parameters ◽  
Sampling Period ◽  
Human Consumption ◽  
Food And Agriculture ◽  
Sampling Campaign ◽  
Al Hoceima ◽  
Monthly Variations

The monthly variations in metal concentration of Cadmium (Cd), Zinc (Zn) and Chromium (Cr) were determined in tissues of Mytilus galloprovincialis and seawater obtained from the mussel farm installed along the Al Hoceima coasts, during the sampling period of 2018. The heavy metals encountered in the bivalves were higher than those observed in their environment with a decreasing order of Zn > Cr > Cd. The results also showed a decreasing trend for the metals studied during the summer sampling campaign. The maximum values were obtained during the wet periods. The monthly variations in trace metals observed in the mussel tissues were due to environmental parameters and the physiological state of the bivalves. Our results revealed that the average concentrations of pollutants found in M. galloprovincialis were below the limits allowed by the Food and Agriculture Organization of the United Nations (FAO) which are 2.0, 1000 and 1.0 mg/kg, for Cd, Zn and Cr, respectively in molluscan shellfish for human consumption. Therefore, the trace elements present in the tissues of Al Hoceima shore mussels do not represent a risk to human health associated with their consumption, even during the period of their maximum bioaccumulation. Our work highlights the potential use of Mytilus galloprovincialis in the Biomonitoring of metallic pollutants in this region of the northern Moroccan coasts.

scholarly journals WAVES IN WETLANDS: HURRICANE GUSTAV

2011 ◽  
Vol 1 (32) ◽  
pp. 29 ◽  
Author(s):  
Jane McKee Smith ◽  
Robert E. Jensen ◽  
Andrew B. Kennedy ◽  
J. Casey Dietrich ◽  
Joannes J. Westerink
Keyword(s):  
Circulation Model ◽  
Wave Model ◽  
High Energy ◽  
Generation Model ◽  
Wave Modeling ◽  
Wave Measurements ◽  
The Waves ◽  
Variable Water ◽  
Water Depths ◽  
Made In

Few wave measurements have been made in wetlands during high-energy, surge events, such as hurricanes. During Hurricane Gustav in 2008, many nearshore wave measurements were made in Southeastern Louisiana. These data are used to verify a nearshore wave modeling system and to explore the characteristics of hurricane waves in wetlands. The modeling system consists of the wave generation model WAM, the nearhsore wave model STWAVE, and the circulation model ADCIRC. The measurements confirm reasonable success in modeling the waves. The measurements and modeling also expose some of the problems of measuring waves in highly-variable water depths under hurricane forcing and modeling waves in rapidly degrading wetlands.

Availability and Post-harvest losses of fruits and vegetable in Bihar: Economic Analysis

2016 ◽  
Vol 1 (02) ◽  
pp. 207-212
Author(s):  
Meera Kumari ◽  
Shoji Lal Bairwa ◽  
Lokesh Kumar Meena ◽  
Sk. M. Rahman
Keyword(s):  
State Government ◽  
Fruits And Vegetables ◽  
Point Of View ◽  
Human Consumption ◽  
Total Production ◽  
Air Cargo ◽  
Fruit And Vegetable ◽  
Scope For Growth ◽  
Post Harvest ◽  
Wide Range

Bihar is the rich state with abundance natural resources and wide range of diversity in agriculture in comparison to other growing states of the country.Horticultural crops constitute a significant component of total agricultural production of the country and cover nearly 11.6 million ha area with a total production of over 91 million tonnes per year. Production of fruits and vegetables play an important role in generating employment, income and meeting household nutritional security. The combined annual production of fruits and vegetables in India is likely to cross 377 million tonnes (MT) mark by 2021 from the current level of over 227 MT. However, the projected production of fruits and vegetables would only cater to domestic demand leaving no scope for growth on export front due to the huge wastage would continue to rise simultaneously in absence of on-farm processing facilities. Post-harvest losses are very high in fruit, vegetables and root crops as they are much less hardy and are quickly perishable, and if care is not taken in their harvesting, handling and transport, they soon decay and become unfit for human consumption. The importance of post-harvest management for fruit and vegetable trade should not be ignored. New strategies need to be developing to promote adoption of post-harvest technology by the fruit and vegetable growers for good marketing. The creation of market infrastructure from export point of view such as creation of pre- cooling, cold storage, air cargo, packinghouse etc. may be taken up by the concerted efforts of the state government. There is also need to develop the efficient marketing systems with better storage facilities and less number of middlemen for the ultimate welfare of farmers. Thus, the policy makers should promote processing of fruits and vegetables for value addition and also explore export avenues.

Studies on Management of a Wild Yam (Dioscorea alata) and a Wild Tanier (Xanthosoma sp.)

1969 ◽  
Vol 65 (1) ◽  
pp. 58-61
Author(s):  
Fernando Abruña ◽  
Nicolás Díaz ◽  
José Vicente-Chandler
Keyword(s):  
Human Consumption ◽  
Dioscorea Alata ◽  
Total Production ◽  
Root Crop ◽  
Vigorous Growth ◽  
Pig Feed ◽  
Wild Yam ◽  
Planting System

A wild yam (Dioscorea alata) appears to be unaffected by insects or diseases and its vigorous growth smothers all weeds. Total production of over 40 t/ha of tubers, of which 30 t/ha were suitable for human consumption, were produced with the best planting system. Benching alone increased yields from 19.8 to 24.4 t/ha. Benching and staking increased marketable yields from 19.8 to 31.8 t/ha, and total yields from 26.4 to 41.9 t/ha. Higher yields were produced with 1 x 1 m than with 1 x 2 m spacing. Yields of a wild tanier cultivar harvested at 31 months after planting increased with closer spacing from 34.8 t/ha with 9,200 plants to 99.2 t/ha with 48,900 plants. Intermediate yields were obtained with intermediate spacings. Planting in beds did not increase yields over those for level planting. This root crop can be consumed by humans but is best used as pig feed.

scholarly journals Towards sustainable European seaweed value chains: a triple P perspective

2019 ◽  
Author(s):  
S W K van den Burg ◽  
H Dagevos ◽  
R J K Helmes
Keyword(s):  
Food System ◽  
Production Systems ◽  
World Market ◽  
Human Consumption ◽  
Triple P ◽  
Total Production ◽  
Future Directions ◽  
System A ◽  
The Right ◽  
A Minor

Abstract Seaweeds are seen as important future feedstock for Europe, providing biomass for food, feed, and other applications. Seaweeds can contribute to a circular food system a protein transition and bio-based economy. Europe is a minor player in the world market dominated by the Asian producers and processors. According to the FAO, total production of aquatic plants (dominated by seaweed) was 30 million tonnes in 2016, with China (47.9%) and Indonesia (38, 7%) dominating production. This article discusses the challenges to seaweed production and use in Europe and formulates future directions for upscaling the European seaweed sector. From a People, Planet, Profit perspective, there is no need to focus on producing large volumes of seaweed per se. We need to focus on nature-inclusive production systems, producing the right amount of the right seaweeds, based on the carrying capacity of the European seas. The seaweed sector must avoid developing along the “old” economy’s way of cost leadership but develop along the way of the “new” circular economy. Seaweeds should not be seen as a new product “added” to the market but become an integral part of the European food system, being used for human consumption, feed and improving production processes.

scholarly journals Bulk versus Spectral Wave Parameters: Implications on Stokes Drift Estimates, Regional Wave Modeling, and HF Radars Applications

2017 ◽  
Vol 47 (6) ◽  
pp. 1413-1431 ◽  
Author(s):  
Nirnimesh Kumar ◽  
Douglas L. Cahl ◽  
Sean C. Crosby ◽  
George Voulgaris
Keyword(s):  
Boundary Conditions ◽  
Wave Model ◽  
Stokes Drift ◽  
Open Boundary ◽  
Bulk Wave ◽  
Open Boundary Conditions ◽  
Wave Modeling ◽  
Model Simulations ◽  
Wave Parameters ◽  
Wave Models

AbstractAccurate estimates of Stokes drift are necessary to quantify Lagrangian transport and upper-ocean mixing. These can be estimated from directional wave spectra. Here, a methodology for the reconstruction of such spectra is developed using partitioned bulk wave parameters provided by global wave models. These reconstructed spectra agree well with global wave model–simulated full spectra. Regional wave model simulations with reconstructed spectra as open boundary conditions lead to more accurate estimates of bulk wave parameters in the coastal ocean. Furthermore, the reconstructed directional spectra can be used to improve high-frequency (HF) radar–derived surface Lagrangian current estimates. Stokes drift vertical profiles from complete directional spectra are more accurate, and therefore coupled ocean circulation and wave models should incorporate spectral estimates for wave–current interaction studies. Based on model simulations conducted here, it is recommended that regional wave modeling studies use partitioned rather than bulk wave parameter products from global wave simulations to reconstruct complete directional spectra for open boundary conditions. Finally, this study shows that inclusion of the peak spectral energy for each partition improves the ability to reconstruct more accurately directional spectra and surface Stokes drift. It is recommended that the global wave model hindcast/forecast include this additional bulk parameter.

scholarly journals The Red Sea: A Natural Laboratory for Wind and Wave Modeling

2014 ◽  
Vol 44 (12) ◽  
pp. 3139-3159 ◽  
Author(s):  
Sabique Langodan ◽  
Luigi Cavaleri ◽  
Yesubabu Viswanadhapalli ◽  
Ibrahim Hoteit
Keyword(s):  
Red Sea ◽  
Wave Model ◽  
Local Fields ◽  
Wave Modeling ◽  
Weather Forecasts ◽  
Wave Patterns ◽  
Wave Models ◽  
Future Work ◽  
Enhanced Surface ◽  
Natural Laboratory

Abstract The Red Sea is a narrow, elongated basin that is more than 2000 km long. This deceivingly simple structure offers very interesting challenges for wind and wave modeling, not easily, if ever, found elsewhere. Using standard meteorological products and local wind and wave models, this study explores how well the general and unusual wind and wave patterns of the Red Sea could be reproduced. The authors obtain the best results using two rather opposite approaches: the high-resolution Weather Research Forecasting (WRF) local model and the slightly enhanced surface winds from the global European Centre for Medium-Range Weather Forecasts model. The reasons why these two approaches produce the best results and the implications on wave modeling in the Red Sea are discussed. The unusual wind and wave patterns in the Red Sea suggest that the currently available wave model source functions may not properly represent the evolution of local fields. However, within limits, the WAVEWATCH III wave model, based on Janssen’s and also Ardhuin’s wave model physics, provides very reasonable results in many cases. The authors also discuss these findings and outline related future work.

scholarly journals Kajian Pustaka Asesmen Status Kondisi Ekosistem Mangrove

2020 ◽  
Vol 1 (2) ◽  
pp. 48-56
Author(s):  
Gathot Winarso ◽  
Muhammad Kamal ◽  
Mohammad Syamsu Rosid ◽  
Wikanti Asriningrum ◽  
Jatna Supriatna
Keyword(s):  
Diversity Index ◽  
Good Condition ◽  
Ecological Integrity ◽  
Environmental Parameters ◽  
Mangrove Forests ◽  
Density Structure ◽  
Canopy Density ◽  
Mangrove Ecosystems ◽  
The Status ◽  
Potential Area

The mangrove area of the world has been decreasing and Indonesia has lost 1.6 million ha of mangrove during the period 1980-2005. In 2015 the status of Indonesia's mangroves was 3.5 million ha with 48% in good condition and 52% in degraded conditions. Therefore, mangrove forests should be conserved properly and utilized sustainably. Assessment of the status of mangrove conditions is essential in conservation planning and management so that it can be done better. However, the method for assessing the condition of mangrove forests is still diverse and has not been standardized, so a literature review and review of how to assess the condition of mangrove ecosystems from various literature needs to be done. The results of the study of various literatures, in general there are two types of assessments. The first assessment used canopy density indicators, tree density, structure and composition of vegetation including diversity index and environmental parameters which are used singly or a combination of some or all parameters and some that be correlated with ecological integrity. For the second assessment, using a comparison between the existing mangrove forest and the potential area to be overgrown with mangroves. There is a difference when assessing the potential area, there is the opinion of the area potentially seen by the status of the area whether or not the forest area, from the landsystem, the level of abrasion, pond area and the comparison of the coastline length overgrown with mangrove with a total coastline length. Both assessments with each indicator can be used in accordance with the objectives of the assessment of the condition.

scholarly journals Survey on Carp Seed Production in Private Fish Hatcheries of Nepal

ZOO-Journal ◽  
2019 ◽  
Vol 5 ◽  
pp. 7-15
Author(s):  
Dilip K Jha ◽  
Ram C Bhujel ◽  
Anil K Anal
Keyword(s):  
Seed Production ◽  
Government Policy ◽  
Total Production ◽  
Sustainable Aquaculture ◽  
Western Development ◽  
Increasing Trend ◽  
Development Region ◽  
The Status ◽  
High Quality Seed ◽  
Aquaculture Development

Aquaculture is rapidly expanding in Nepal as a result demand for fish seed is increasing. Access to adequate high quality seed is the basis for sustainable aquaculture development. Due to quick and high profitability, and encouraging government policy, a number of private hatcheries are increasing especially in southern parts of the country. A survey of 40 private fish hatcheries was conducted from different regions (Eastern-9; Central-19, Western-6, Midwestern-3 and Farwestern-3) representing 15 districts (Morang, Sunsari, Saptari, Siraha, Dhanusha, Mahottari, Bara, Chitwan, Nawalparasi, Rupandehi, Kapilvastu, Banke, Bardiya, Kailali and Kanchanpur) of Terai and inner Terai to assess the status of different stages of seed production within five year from March 2009 to April 2014. The survey revealed that total production of hatchlings, fry and advanced fry within five years were 15852.6, 879.5 and 259.5 million respectively. All these development regions showed increasing trend of their own contribution within a total of five years. The percentage of eggs fertility and hatchability was more (78.3 and 71.7) in mid western development region followed by eastern (68.9 and 61.7), central (68.3 and 61.7), far western (68.3 and 61.7) and western (68.3 and 60.0). Though private hatcheries played important role in seed production, improving their efficiency are imperative, further studies are recommended to overcome constraints on carp seed production.

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