scholarly journals Prediksi Perubahan Arus Akibat Reklamasi pada Pangkal Breakwater Barat Pelabuhan Tanjung Emas Semarang dengan Pendekatan Model Matematik

2016 ◽  
Vol 18 (3) ◽  
pp. 147
Author(s):  
Sugeng Widada
Keyword(s):  
Land Reclamation ◽  
Tide Gauge ◽  
Ocean Model ◽  
The West ◽  
Current Pattern ◽  
Reclaimed Land ◽  
Princeton Ocean Model ◽  
Reclamation Area ◽  
Current Flows ◽  
Break Water

Kebutuhan lahan dan dermaga, Pelindo III Tanjung Emas Semarang berencana melakukan reklamasi seluas 22,02 Ha menempel di sebelah barat pangkal break water barat pelabuhan. Daratan baru hasil reklamasi akan merubah bentuk garis pantai, maka dipastikan akan merubah pola arus yang selanjutnya berakibat pada pola transport sedimen dan sedimentasinya. Penelitian ini bertujuan untuk mempredikasikan pengaruh reklamasi tersebut di atas terhadap pola arus di perairan sekitar Pelabuhan Tanjung Emas Semarang, sehingga dapat dilakukan antisipasi dampak lanjutan yang mungkin terjadi. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif denganpendekatan pemodelan matematis. Data arus diperoleh melalui pengukuran menggunakan ADCP dan data pasut diperoleh dari pengamatan palem pasut. Sedangkan data batimetri diambil dari data hasil pengukuran yang dilakukan oleh Pelindo III sebelumnya.Model hidrodinamika yang digunakan dalam penelitian ini adalah model POM (the Princeton Ocean Model) untuk kasus model 2D. Hasil penelitian menunjukan pola arus di perairan pelabuhan Tanjung Emas dan sekitarnya dipredikasikan tidak mengalamai perubahan yang signifikan dengan adanya reklamasi seluas 22 Ha di pangkal break water barat pelabuhan tersebut. Namun demikian arus menjadi sangat lambat hingga kurang dari 0,1 m/det tepat disisi barat lahan reklamasi sehingga berpotensi terjadinya sedimentasi di lokasi tersebut. Demikian juga tepat di sebelah timur lahan reklamasi, arus saat pasang masuk ke kolam labuh dengan kecepatan 0,2 m/det dan keluar saat surut dengan kecepatan 0,06 m/det sehingga berpotensi terjadi sedimentasi di sisi barat kolam labuhKata Kunci: Pelabuhan, Pelindo, Arus, Reklamasi, Tanjung MasPelindo III Tanjung Emas Semarang planned reclamation area of 22.02 ha on the west base of the west break water to Tmeet the needs of the land and pier. The new land reclamation will change the coastline, then it certainly will change the current pattern which in turn resulted in sediment transport and sedimentation patterns. The research was conducted to determinethe reclamation effect to the current in the waters around the Tanjung Emas Port Semarang, so it can be anticipatted the continued impact that may occur. The method used in this research is quantitative method with a mathematical modeling approach. Current was measured using ADCP and the tide was observed by tide gauge While the bathymetric taken from data which measured by Pelindo III earlier. Hydrodynamic model used in this study is a model POM (the Princeton Ocean Model) for the case of 2D models. The results showed that the current in the waters of Tanjung Emas harbor and surrounding predicated not experiencing a significant change in the reclamation area of 22 hectares at the base of the break water west of the port. However, the current becomes very slow to less than 0.1 m / s in the west side of reclaimed land, so it potential occurrence of sedimentation in these locations. Likewise, just east of land reclamation, the current flows into the pond at a speed of 0.2 m / s and out with a speed of 0.06 m / s, so it potential occurrence of sedimentation.Keywords: Port, Pelindo, Currents, Reclamation, Tanjung Mas

scholarly journals Land Subsidence Analysis of Reclaimed Land using Time-Lapse Microgravity Anomaly in Manado, Indonesia

2018 ◽  
Vol 32 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Sandy Nur Eko Wibowo ◽  
Gybert E. Mamuaya ◽  
Rignolda Djamaluddin
Keyword(s):  
Land Subsidence ◽  
Land Reclamation ◽  
Vertical Gradient ◽  
Time Lapse ◽  
Positive Anomaly ◽  
Natural Ecosystems ◽  
Reclaimed Land ◽  
The North ◽  
Gps Survey ◽  
Reclamation Area

Coastal area land reclamation is a policy with various benefits, including its potential to increase economic growth. However, reclamation also potentially has adverse impacts on the environment, including increasing pressure on biodiversity, natural resources and natural ecosystems, and the most common problem is land subsidence. This study uses time-lapse microgravity anomaly to ascertain the distribution of gravity and vertical gradient anomaly in order to map the subsidence characteristics occurring in the Manado reclamation area. From the research that has been previously conducted, the positive gravity anomaly is spread around Megamall-Multimart to the north of Monaco Bay and on the southern side of Manado Town Square (Mantos). Positive anomaly values range from 3 to 29.7 μGal. The negative anomaly values are scattered around the Mantos and Megamas separating bridge and at some points around the Whiz Prime Hotel, Menora Church and towards the Pohon Kasih Megamas area. The reclaimed areas generally experience subsidence accompanied by a reduction in groundwater mass (Megamall and Mantos) due to the use of the groundwater by the community in these areas. Uplifts also occur at some points in the reclamation area of Megamas as a result of the occurrence of land subsidence. Longer-term research is needed to determine whether there is an increase in the rate of land subsidence in the Manado reclamation area. Over a longer period of time it can also be established whether there are other factors which affect land subsidence. Other geodetic methods to monitor subsidence, such as levelling, InSAR and GPS survey, which have been conducted in other locations, are also needed to obtain more detailed information about the land subsidence in this area.

scholarly journals Identification of land reclamation area and potential plantation area on Bagmati river-basin in the Terai region of Nepal

2016 ◽  
Vol 26 (1) ◽  
pp. 53-59
Author(s):  
A. K. Acharya ◽  
A. K. Chaudhary ◽  
S. Khanal
Keyword(s):  
Land Cover ◽  
Image Classification ◽  
River Basin ◽  
Land Reclamation ◽  
Forest Products ◽  
Landsat 8 ◽  
Reclaimed Land ◽  
Water Index ◽  
Reclamation Area ◽  
Bagmati River

Utilization of land reclamation area offers the potentiality of increasing greenery as well as providing forest products. This study refers to the identification of the land reclamation areas and potential plantation areas on the Bagmati river-basin in the Terai region of Nepal, and recommends appropriate species for plantation in order to rehabilitate such areas. Multi-temporal Landsat Satellite Images (Landsat 7 and Landsat 8) were acquired for 2002 and 2014. Object-based Image Classification method was used to classify the land cover classes into four broad categories: i) Water, ii) Sand and gravel, iii) Plantation potential (open areas suitable for plantation) and iii) Others (forest, agriculture, built-up areas etc.). The Mean Normalized Difference Water Index (NDWI) values and Mean Brightness values were found to be helpful in identifying the water and sand & gravel areas from the other land cover classes. The overall classification accuracy was 0.97 with a kappa coefficient of 0.89 in the case of the 2014 Image classification. In this study, the land reclamation area referred to the areas occupied by water, sand & gravel on the river-beds that were converted into plantation potential and other classes between 2002 and 2014. Similarly, the potential plantation area referred to the summation of the area of reclaimed land, the area of ‘Others’ class converted into ‘Plantation potential’ class and the area that remained to be plantation potential on the bed of the Bagmati River and its tributaries between 2002 and 2014. Altogether, 4,819.10 ha land was reclaimed in the study area, and a total of 5,395.10 ha land was found to be potential for plantation within the study area.Banko JanakariA Journal of Forestry Information for NepalVol. 26, No. 1, Page:53-59, 2016

The practice of reclaimed land be converted to arable land in China

2020 ◽  
Author(s):  
Xiangbing Kong ◽  
Liangyou Wen
Keyword(s):  
Family Income ◽  
Land Reclamation ◽  
Arable Land ◽  
Coal Mines ◽  
Ecological Environment ◽  
Soil Conditions ◽  
Chinese Government ◽  
Reclaimed Land ◽  
Brick Kilns ◽  
Reclamation Area

<p> </p><p>Land reclaim can be converted to arable land in China. Land reclamation is the process of reclamation and restoration to arable land on the basis of the original abandoned independent land. It mainly includes: land for coal mines, quarries, brick kilns, warehouses, other enterprises and institutions, and abandoned rural construction land. As of 2015, China's construction activities and natural disasters have damaged about 10 million hm<sup>2</sup> of land, with an annual increase of about 270,000 hm<sup>2</sup>. China's land reclamation rate is about 45%, of which about 50% of the land reclaimed is arable land. China has a large number of land reclamation practices and has very rich experience. First, we carried out land adaptability evaluation in the reclamation area .we selected the currently land for coal mines, quarries, brick kilns, warehouses, and other enterprises and institutions from natural, economic, and social aspects to evaluate its suitability, comprehensively calculated the consolidation potential, and calculated the area that could be reclaimed as arable land. Second, we carried out arable land construction in the reclamation area. Through land consolidation methods such as land leveling, farmland irrigation and drainage construction, shelterbelt network layout, and farmland road construction, rural residential areas that can be reclaimed as arable land, which will be sorted higher productivity arable land with a centralized patch, good irrigation and drainage , and complete farmland roads. Third, according to the soil conditions of the reclamation area, we carry out soil fertilization. We plowed the soil, applyed organic manure and soil biochar, improved soil water retention and porosity, enhanced soil fertility, improved arable land quality, and increased land production potential. Finally, after the land is reclaimed as arable land, we will monitor the soil conditions and ecological environment of the newly reclaimed arable land on a regular basis through the establishment of a regulatory agency. As same time, while we tried to meeting the fertility of the newly reclaimed arable land, we moinitor the ecological environment of the newly reclaimed land, ensuring sustainable use of arable land. Through the land reclamation, the per capita arable land area in the country have be increased by 0.08 mu. the annual grain yield per mu is calculated at 400kg, which increased 40 billion kg of grain each year. what’s more, farmers have increased the area of ​​arable land, increased their family income, and let themselves live better. By land be reclaimed to arable land, Chinese government has effectively protected 1.2 billion hm<sup>2</sup> of Red line of arable land and ensured national food security. At same time, farmers' income was increased by increasing of crop area, and intensive land conservation has been achieved, which has solved our country to a certain extent.</p>

A STUDY ON THE ROLE OF HABITATS OF A TIDAL LAND RECLAMATION AREA FOR WINTER MIGRANTS IN KOREA

2013 ◽  
Vol 62 ◽  
pp. 44-51
Author(s):  
Park Sang Hyun ◽  
Kim Jae Ok ◽  
Ji Kwang Jae ◽  
Lee Deog Bae
Keyword(s):  
Land Reclamation ◽  
Reclamation Area

Vacuum preloading consolidation of reclaimed land: a case study

1998 ◽  
Vol 35 (5) ◽  
pp. 740-749 ◽  
Author(s):  
J Q Shang ◽  
M Tang ◽  
Z Miao
Keyword(s):  
Land Reclamation ◽  
Soil Improvement ◽  
Large Area ◽  
Vacuum Preloading ◽  
Reclaimed Land ◽  
Improvement Project ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Soft Clays

This case study presents the design, operation, and results of a soil improvement project using the vacuum preloading method on 480 000 m2 of reclaimed land in Xingang Port, Tianjing, China. The areas treated with vacuum ranged from 5000 to 30 000 m2. The effects of soil improvement are demonstrated through the average consolidation settlement of 2.0 m and increases in undrained shear strengths by a factor of two to four or more. The study shows that the vacuum method is an effective tool for the consolidation of very soft, highly compressive clayey soils over a large area. The technique is especially feasible in cases where there is a lack of surcharge loading fills, extremely low shear strength, soft ground adjacent to critical slopes, and access to a power supply.Key words: vacuum preloading consolidation, soil improvement, soft clays, land reclamation, prefabricated vertical drains.

scholarly journals A new approach to increase land reclamation rate in coal mining subsidence area: A case study of Guqiao Coal Mine, China

2021 ◽  
Author(s):  
Gensheng LI ◽  
Jianxuan Shang ◽  
Zhenqi Hu ◽  
Dongzhu Yuan ◽  
Pengyu Li ◽  
...  
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Land Reclamation ◽  
Water Area ◽  
Land Area ◽  
Reclaimed Land ◽  
Land Protection ◽  
Mining Areas ◽  
Concurrent Mining And Reclamation ◽  
Coal Mining Subsidence

Underground coal mining will inevitably cause land ponding in high groundwater table, which will affect the land sustainable development. However, the traditional reclamation (TR) is poor in land rate. Thus, finding a suitable reclamation approach is crucial to alleviate the conflicts between coal exploitation and land protection. In this paper, taking Guqiao Coal Mine of China was seriously affected by mining-induced ponding as an example. Firstly, dynamic distribution of surface subsidence and land damage from 2007 to 2017 was revealed base on concurrent mining and reclamation (CMR). Second, the land-water layout of five reclamation schemes (no reclamation, TR, CMR I, CMR II and CMR III) were simulated. Then, and the dynamic filling elevation model and filling thickness model were constructed. Finally, the sequence of earthwork allocation was optimized. The results revealed that: 1) reclaimed land area: CMR III > CMR II > CMR I > TR > no reclamation; 2) The digging depth is directly proportional to earthwork volume and land area, and inversely proportional to water area, but with increase of digging depth, the increase in the reclaimed land area relatively slowed down; 3) CMRs had reclaimed 426.31~637.82 ha and 259.62~471.13 ha more than the no reclamation and TR respectively. Compared with the no reclamation and TR, CMRs can increase the proportion of reclaimed land by 33.77~50.52% and 20.57~37.32% respectively. The research results provide a reference to increase the reclamation rate of mining areas in the high phreatic table.

scholarly journals Characterizing and Monitoring Ground Settlement of Marine Reclamation Land of Xiamen New Airport, China with Sentinel-1 SAR Datasets

2019 ◽  
Vol 11 (5) ◽  
pp. 585 ◽  
Author(s):  
Xiaojie Liu ◽  
Chaoying Zhao ◽  
Qin Zhang ◽  
Chengsheng Yang ◽  
Jing Zhang
Keyword(s):  
Land Reclamation ◽  
Ground Deformation ◽  
Second Phase ◽  
Spatial Evolution ◽  
Soil Consolidation ◽  
Ground Settlement ◽  
Reclaimed Land ◽  
Phase Measurements ◽  
Under Construction ◽  
Sbas Insar

Artificial lands or islands reclaimed from the sea due to their vast land spaces and air are suitable for the construction of airports, harbors, and industrial parks, which are convenient for human and cargo transportation. However, the settlement process of reclamation foundation is a problem of public concern, including soil consolidation and water recharge. Xiamen New Airport, one of the largest international airports in China, has been under construction on marine reclamation land for three years. At present, the airport has reached the second phase of construction, occupying 15.33 km2. The project will last about twenty years. To investigate the temporal and spatial evolution of ground settlement associated with land reclamation, Sentinel-1 synthetic aperture radar (SAR) data, including intensity images and phase measurements, were considered. A total of 82 SAR images acquired by C-band Sentinel-1 satellite covering the time period from August 2015 to October 2018 were collected. First, the spatial evolution process of land reclamation was analyzed by exploring the time series of SAR image intensity maps. Then, the small baseline subset InSAR (SBAS–InSAR) technique was used to retrieve ground deformation information over the past three years for the first time since land reclamation. Results suggest that the reclaimed land experienced remarkable subsidence, especially after the second phase of land reclamation. Furthermore, 26 ground settlement areas (i.e., 0.015% of the whole area) associated with land reclamation were uncovered over an area of more than 1200 km2 of the Xiamen coastal area from January 2017 to October 2018. This study offers important guidance for the next phase of land reclamation and the future construction of Xiamen New Airport.

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