The Non Dredged Reclamation Method Environmental Sciences Essay

With the rapid sparing and population growing, assorted sparing, societal, lodging and transferee demands of the community are increasing, ensuing in increasing demand for land offer. receivable to the limited land hang on, replacing is usually apply to under cause the production line in Hong Kong. However, innovation does non and lend to the economical development but besides the environmental debasement. In this essay, jobs caused by innovation and workable solutions bequeath be discussed.As charactered in Environmental Impact Assessment musical theme ( 2001 ) , d deprivationging, disposal of naval trunk and mass filling activities whitethorn give emanation to many a(prenominal) possible impacts on body of water eccentric. First, solids may be suspend in the water supply column. Second, as system contemptible ridges and turbulent flow leave alone be generated, by perturbation, organic and inorganic substances e.g. ammonium hydroxide, heavy metals and sulfides may be released into the H2O column. Third, during the compacting and settling procedure in put formation, contaminations and leachate may be given come on from pore H2O and deposits severally. As a consequence, the leatherneck H2O quality result be deteriorated.2.2 Marine ecosystemHarmonizing to Chan ( 2000 ) , dredging and disposal of flagellate involved in diversity forget convey inauspicious effects to the marine ecosystem. First, remotion of deposit may take to the loss of home ground. Second, marine beings may entrain during dredging. Third, dissolved O provide be depleted and foods will be released into the H2O. In peculiar, if t here(predicate) is a beta rise in the alimentary degree, algal productiveness will increase which may ensue in & A acirc ?red tides & A acirc A? .2.3 Air qualityThe job of dividing line contamination will originate during the operation period of renewal as a great effect of dust will be emitted where the & A acirc ?dust & A acirc A? here refers to general suspended particulates. Among assorted sorts of beginnings of air pollution, earthmoving ( lading, droping and bulldozing ) , haul route handicraft on unpaved roads and wind wearing of the unfastened site country trim back the air quality the most ( Chan, 2000 ) .Solutions3.1 The non-dredged renewal method actingTraditionally, the soft Marine clay in the ocean floor is replaced by sand fill to do a dependable foundation for seawall building. Dredging and disposing of Marine clay are then involved. As the dredging procedure in renewal is the important cause for the environmental impacts mentioned above, the non-dredged renewal method is advocated for the future renewal undertakings. Making mention to Hong Kong-Zhuhai-Macau Bridge Hong Kong Projects ( 2011 ) , this renewal method does non collision dredging the soft Marine clay in the ocean floor before backfilling. Alternatively, sloppy building and destruction stuff is used to make full many big interlocked steel cells. The steel cells will so drop in the H2O and keep on the alluvial sediment, organizing the margin wall. ( Items, 2011 )As found in Items ( 2011 ) , the non-dredge renewal has many benefits over the effected dredge wall building method. For case, dredging and dumping of Marine clay arouse be about altogether avoided. Besides, merely 30 % of the original suspended atoms will be released during renewal and merely half of the backfilling stuff will be needed. Thus the building Marine traffic can be decreased by about 50 % . It can be concluded that the non-dredge renewal method will convey less environmental impacts and therefore it is a better pick for renewal.3.2 festering of hole-and-corner(a) blankEnhanced fashion of undercover infinite is an effectual and possible option to increase land supply as Hong Kong is cragged and abundant with strong volcanic and flinty stones. This geographic singularity favors the development of belowground inf inite in Hong Kong. Rock caverns can be certain for assorted land utilizations such as crematory, substation, sewerage intervention installations etc ( Hong Kong Underground post Study Executive Summary, 2009 ) .While two steps can alleviate the job of deficiency of available land, developing belowground infinite has well-nigh advantages over renewal. For illustration, some unwanted utilizations like garbage ingathering point can be build underground so that the impacts on the occupants populating near can be minimised. Furthermore, developing belowground infinite does non do much pollution or take away native resources, which means that the natural environment can be preserved.DecisionThough renewal can supply for the demands of the economic development, the conventional renewal method causes H2O pollution, air pollution and adversely affects the marine ecosystem, which is non an beau ideal act for the society. In order to strike a balance between economic growing and envi ronmental preservation, the non-dredged renewal method should be adopted for future renewal undertakings as it is more environmentally friendly. In add-on to renewal, development of belowground infinite should be considered which can move as an option to increase land supply and reserve our valuable seaport.