scholarly journals Mapping Impact of Tidal Flooding on Solar Salt Farming in Northern Java using a Hydrodynamic Model

2019 ◽  
Vol 8 (10) ◽  
pp. 451 ◽  
Author(s):  
Nirwansyah ◽  
Braun
Keyword(s):  
High Tide ◽  
Water Levels ◽  
North Coast ◽  
Flood Events ◽  
Accurate Identification ◽  
Solar Salt ◽  
Salt Production ◽  
The North ◽  
Production Area ◽  
The Impact

The number of tidal flood events has been increasing in Indonesia in the last decade, especially along the north coast of Java. Hydrodynamic models in combination with Geographic Information System applications are used to assess the impact of high tide events upon the salt production in Cirebon, West Java. Two major flood events in June 2016 and May 2018 were selected for the simulation within inputs of tidal height records, national seamless digital elevation dataset of Indonesia (DEMNAS), Indonesian gridded national bathymetry (BATNAS), and wind data from OGIMET. We used a finite method on MIKE 21 to determine peak water levels, and validation for the velocity component using TPXO9 and Tidal Model Driver (TMD). The benchmark of the inundation is taken from the maximum water level of the simulation. This study utilized ArcGIS for the spatial analysis of tidal flood distribution upon solar salt production area, particularly where the tides are dominated by local factors. The results indicated that during the peak events in June 2016 and May 2018, about 83% to 84% of salt ponds were being inundated, respectively. The accurate identification of flooded areas also provided valuable information for tidal flood assessment of marginal agriculture in data-scarce region.

scholarly journals ASSESSING TIDAL FLOOD UPON SOLAR SALT FARMING AREA IN NORTH PART OF JAVA USING HYDRODYNAMIC MODEL

2019 ◽  
Vol XLII-3/W8 ◽  
pp. 283-286
Author(s):  
A. W. Nirwansyah ◽  
B. Braun
Keyword(s):  
Water Level ◽  
Extreme Event ◽  
Single Case ◽  
High Tide ◽  
Peak Level ◽  
Accurate Identification ◽  
Salt Production ◽  
North Part ◽  
Production Area ◽  
The Impact

<p><strong>Abstract.</strong> This study aims to assess the impact of high tide upon salt production areas in north part of Java, Indonesia. Single case in June 2016 was applied using MIKE 21 in salt production area of Cirebon. The inputs are tidal height records, bathymetry, digital elevation model (DEM) from Geospatial Information Agency (GIA), and wind data from OGIMET. Peak water level from tidal constituent is extracted from the simulation. The exposed that were generated from peak level of water elevation showed that tidal event has led to 82.9% of salt production area being inundated. West and east part are recorded as the most affected location due to this extreme event. The maximum water level has reached about 38 cm and covered more than 6,489.38 ha during the tide. Whilst the accurate identification will provide valuable information for flood assessment upon marginal agriculture in coastal area.</p>

Seed production and seedling emergence of Giant Parramatta grass on the north coast of New South Wales

1996 ◽  
Vol 36 (3) ◽  
pp. 299 ◽  
Author(s):  
TS Andrews ◽  
RDB Whalley ◽  
CE Jones
Keyword(s):  
Seed Production ◽  
Seed Bank ◽  
New South ◽  
New South Wales ◽  
Seed Banks ◽  
North Coast ◽  
The North ◽  
South Wales ◽  
Seed Fall ◽  
The Impact

Inputs and losses from Giant Parramatta grass [GPG, Sporobolus indicus (L.) R. Br. var. major (Buse) Baaijens] soil seed banks were quantified on the North Coast of New South Wales. Monthly potential seed production and actual seed fall was estimated at Valla during 1991-92. Total potential production was >668 000 seeds/m2 for the season, while seed fall was >146000 seeds/m2. Seed fall >10000 seeds/m2.month was recorded from January until May, with further seed falls recorded in June and July. The impact of seed production on seed banks was assessed by estimating seed banks in the seed production quadrats before and after seed fall. Seed banks in 4 of the 6 sites decreased in year 2, although seed numbers at 1 damp site increased markedly. Defoliation from mid-December until February, April or June prevented seed production, reducing seed banks by 34% over 7 months. Seed banks in undefoliated plots increased by 3300 seeds/m2, although seed fall was estimated at >114 000 seeds/m2. Emergence of GPG seedlings from artificially established and naturally occurring, persistent seed banks was recorded for 3 years from bare and vegetated treatment plots. Sown seeds showed high levels of innate dormancy and only 4% of seeds emerged when sown immediately after collection. Longer storage of seeds after collection resulted in more seedlings emerging. Estimates of persistent seed banks ranged from 1650 to about 21260 seeds/m2. Most seedlings emerged in spring or autumn and this was correlated with rainfall but not with ambient temperatures. Rates of seed bank decline in both bare and vegetated treatment plots was estimated by fitting exponential decay curves to seed bank estimates. Assuming no further seed inputs, it was estimated that it would take about 3 and 5 years, respectively, for seed banks to decline to 150 seeds/m2 in bare and vegetated treatments.

scholarly journals Evidence for Freshwater Residualism in Coho Salmon, Oncorhynchus kisutch, From a Watershed on the North Coast of British Columbia

2017 ◽  
Vol 130 (4) ◽  
pp. 336 ◽  
Author(s):  
Eric A Parkinson ◽  
Chris J Perrin ◽  
Daniel Ramos-Espinoza ◽  
Eric B Taylor
Keyword(s):  
British Columbia ◽  
Fresh Water ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Oncorhynchus Kisutch ◽  
Water Levels ◽  
North Coast ◽  
The North ◽  
Seaward Migration ◽  
Mature Fish

The Coho Salmon, Oncorhynchus kisutch, is one of seven species of Pacific salmon and trout native to northeastern Pacific Ocean watersheds. The species is typically anadromous; adults reproduce in fresh water where juveniles reside for 1–2 years before seaward migration after which the majority of growth occurs in the ocean before maturation at 2–4 years old when adults return to fresh water to spawn. Here, we report maturation of Coho Salmon in two freshwater lakes on the north coast of British Columbia apparently without their being to sea. A total of 15 mature fish (11 males and four females) were collected in two lakes across two years. The mature fish were all at least 29 cm in total length and ranged in age from three to five years old. The occurrence of Coho Salmon that have matured in fresh water without first going to sea is exceedingly rare in their natural range, especially for females. Such mature Coho Salmon may represent residual and distinct breeding populations from those in adjacent streams. Alternatively, they may result from the ephemeral restriction in the opportunity to migrate seaward owing to low water levels in the spring when Coho Salmon typically migrate to sea after 1–2 years in fresh water. Regardless of their origin, the ability to mature in fresh water without seaward migration may represent important adaptive life history plasticity in response to variable environments.

scholarly journals The Impact of the North Coast Highway on Socioeconomic Status and Family Life of Residents in Bogue Village, Jamaica

2009 ◽  
Vol 5 (2) ◽  
Author(s):  
Donovan McGrowder ◽  
Lennox Anderson Jackson ◽  
Rohan Forrester ◽  
Carla Edie ◽  
Angella Crawford ◽  
...  
Keyword(s):  
Socioeconomic Status ◽  
Family Life ◽  
North Coast ◽  
The North ◽  
The Impact

scholarly journals Factors Influencing Movement of the Manila Dunes and Its Impact on Establishing Non-Native Species

2020 ◽  
Vol 12 (10) ◽  
pp. 1536
Author(s):  
Buddhika Madurapperuma ◽  
James Lamping ◽  
Michael McDermott ◽  
Brian Murphy ◽  
Jeremy McFarland ◽  
...  
Keyword(s):  
Native Species ◽  
North Coast ◽  
Vegetation Density ◽  
Dune Vegetation ◽  
Feature Extraction Method ◽  
Humboldt County ◽  
The North ◽  
Remote Sensing Techniques ◽  
Dynamic Communities ◽  
The Impact

Unmanned aerial vehicles (UAVs) are being widely used to monitor microtopographic and vegetation changes in coastal habitats using remote sensing techniques. Sand dune habitats are vital ecosystems along the North coast of Humboldt County in California. This study was conducted at the Manila Dunes, west of the Humboldt Coastal Nature Center, in Manila, California. Various factors influence dune movements, including vegetative stabilization and the creation of social trails. The purpose of this paper is to understand the dune movements in relation to social vs. established trails, vegetation density, topography, and also, mapping invasive vs. native species in the Mal-le’l Dunes area of the Humboldt Bay National Wildlife Refuge. A DJI Mavic Pro multicopter small unmanned aerial vehicle (UAV) was used to fly a 22.5-acre plot of the Manila Dunes. The images from this flight were used to create an orthomosaic image using a photogrammetry process (Structure-from-Motion (SfM)). From our analysis, the installation of trails lessened the impact of dune movements. Social trails digitized within the study site were found to have more local movements than the established trails when compared to movements across the entire site. We compared two methods of classification, viz., the object-based feature extraction method and a pixel-based supervised maximum likelihood classification method, in order to identify the best way to classify dune vegetation. In conclusion, this study is useful for providing baseline dune movement information that can aid in informing how trail and infrastructure constructions can be impacted in land management or in areas with dynamic communities of flora and fauna.

scholarly journals DAMPAK SUBSIDI TERHADAP SURPLUS PRODUSEN DAN TOTAL BENEFIT PERIKANAN TANGKAP PANTURA JAWA TENGAH

2017 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Armen Zulham
Keyword(s):  
Fiscal Policy ◽  
High Impact ◽  
North Coast ◽  
Fishing Community ◽  
The North ◽  
Central Java ◽  
Producer Surplus ◽  
The Government ◽  
Fisheries Subsidies ◽  
The Impact

hidup nelayan. Salah satu indikator untuk menilai peningkatan taraf hidup nelayan akibat dari subsidi adalah surplus produsen dan total benefit dari eksploitasi potensi ikan. Penelitian ini menggunakan quaterly data 1998 - 2002, pada delapan lokasi pendaratan ikan di Pantura Jawa Tengah. Penelitian ini menghitung surplus produsen berdasarkan: baseline (tanpa subsidi) dan subsidi. Perhitungan surplus produsen dilakukan dengan program Maple dengan memasukkan koefisien yang diperoleh dari pendekatan regresi. Secara umum hasil analisis tersebut menunjukkan subsidi perikanan akan mendorong peningkatan surplus produsen. Pengaruh subsidi perikanan yang meningkatkan surplus produsen dalam jumlah yang relatif tinggi terjadi pada daerah Kabupaten Brebes, Kota Tegal, Kabupaten Tegal, Kabupaten Pemalang, dan Kota Pekalongan. Sementara pengaruh subsidi perikanan terhadap peningkatan surplus produsen di Kabupaten Batang, Kabupaten Pekalongan dan Kabupaten Kendal dapat dikatakan relatif kecil. Peningkatan surplus produsen belum tentu meningkatkan total benefit, hal ini terjadi jika surplus produsen baseline lebih besar dari surplus produsen subsidi. Penelitian ini merekomendasikan bahwa pemberian subsidi pada perikanan tangkap perlu lebih teliti dan terarah agartujuan alokasi subsidi tersebut dapat lebih efektif. Tittle: Impact Of Subsidy On Producer Surplus And Total Benefit In The North Coast of the Central Java FisherySubsidy is a fiscal policy; fisheries subsidy proposed by the government intended to support the the standart of living for fishing community. Producer surplus and total benefit could be used as indicators to measured the impact of subsidy on the fishery. The quaterly data from 1998 - 2000 from 8 fish landing centers in Northcoast of Central Java were used in the analysis. The producer surpluses were calculated for baseline and subsidy. The Maple software was used to calculate producer surpluses. In general fisheries subsidy lead to increase producer surplus. A relatively high impact of fisheries subsidy on producer surplus was indicated by Kabupaten Brebes, Kota Tegal, Kabupaten Tegal, Kabupaten Pemalang, and Kota Pekalongan. Meanwhile, the increasing of producer surplus in Kabupaten Batang, Kabupaten Pekalongan and Kabupaten Kendal was indicating relatively low. The increasing value of producer surplus is not necessary follow by the increasing value of the total benefit, particularly when the baseline's producer surplus is greater than subsidy's producer surplus. This research recommends that the fisheries subsidies should be allocated properly to the fishery in order to ensure the effectiveness of the policy.

scholarly journals Filling and plugging of a marine basin by volcanic rocks: the Tunoqqu Member of the Lower Tertiary Vaigat Formation on Nuussuaq, central West Greenland

1996 ◽  
Vol 171 ◽  
pp. 5-28
Author(s):  
A.K Pedersen ◽  
L.M Larsen ◽  
G.K Pedersen ◽  
K.S Dueholm
Keyword(s):  
Volcanic Rocks ◽  
Water Levels ◽  
North Coast ◽  
Magma Chambers ◽  
Tectonic Control ◽  
Crustal Rocks ◽  
The North ◽  
High Level ◽  
Marine Embayment ◽  
Volcanic Cycles

The volcanic Tunoqqu Member formed at the end of the second of three volcanic cycles in the Paleocene Vaigat Formation. The Tunoqqu Member consists of brown aphyric and feldspar-phyric basalts and forms a marker horizon within the grey picritic rocks of the Vaigat Formation. Most of the basalts are siliceous and were produced by contamination with crustal rocks of magmas ranging in composition from picrite to evolved basalt. Some of the basalts were erupted from local volcanic centres of which four have been identified, whereas other basalts form more regional flows. The four identified eruption centres are located along fault lines and zones of uplift and subsidence, indicating tectonic control. Tectonic control is also inferred to be important in terminating the volcanic cycle and causing the development of high-level magma chambers where the magmas stagnated, fractionated, and became contaminated. The basalts of the Tunoqqu Member form subaerial lava flows in western Nuussuaq. Central Nuussuaq constituted a marine embayment in which the volcanics were deposited as eastward prograding foreset-bedded hyaloclastite breccia fans which indicate water depths of up to 160 m. Eastern Nuussuaq was a gneiss highland with a more than 700 m high NW-SE-elongated gneiss promontory stretching into the sea. During Tunoqqu Member time the volcanic rocks reached the gneiss promontory and blocked the outlet from the south to the sea in the north. This resulted in increased water levels in the enclosed embayment and transformation of the outlet into a torrential river. This river eroded the concomitantly forming Tunoqqu Member volcanics and the gneiss promontory and deposited the material in up to more than 250 m thick foreset-bedded boulder conglomerates in the sea where the north coast of Nuussuaq is now situated.

The habitat and management of hairy jointgrass (Arthraxon hispidus, Poaceae) on the north coast of New South Wales, Australia

2020 ◽  
Vol 26 (1) ◽  
pp. 45 ◽  
Author(s):  
Laura White ◽  
Claudia Catterall ◽  
Kathryn Taffs
Keyword(s):  
Threatened Species ◽  
Anthropogenic Disturbance ◽  
New South ◽  
New South Wales ◽  
Freshwater Wetland ◽  
North Coast ◽  
Native Vegetation ◽  
The North ◽  
South Wales ◽  
The Impact

Ecological information about threatened species is required to guide strategic management approaches for effective biodiversity conservation in Australia. Arthraxon hispidus (hairy jointgrass) is a listed threatened species in New South Wales (NSW), but there is limited information on its habitat preferences and native vegetation associations, as well as the impact of historical and ongoing anthropogenic disturbance on its distribution and abundance. In the present study, populations of A. hispidus on the north coast of NSW were surveyed to investigate the habitat characteristics associated with various occurrences of the species. Its preferred habitat was found to be dense ground-cover formations in high-moisture, low-canopy conditions. Cover was highest in moisture-associated assemblages in and around wetlands, drainage lines and groundwater seepages, often in association with native grasses, sedges and herbs. These findings suggest that naturally open freshwater wetland communities comprise the most plausible native habitat niches for A. hispidus populations on the north coast of NSW. A. hispidus also occurs widely among introduced pastures and weeds in previously forested areas, demonstrating the species’ potential to exploit derived habitat. Results indicate that, although ongoing disturbance continues to promote A. hispidus in these exotic-dominated landscapes where historical clearing has created potential habitat opportunities, anthropogenic disturbance (slashing or cattle grazing) is not necessary to sustain A. hispidus within native-dominated wetland communities. Findings suggest more scope for integrated management of A. hispidus within broader native vegetation conservation strategies rather than a single species approach.

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