scholarly journals DISTRIBUSI TEMPORAL DAN SPASIAL TEKANAN UDARA TERKAIT PERTUMBUHAN AWAN DI DAS LARONA, SULAWESI SELATAN

2011 ◽  
Vol 12 (2) ◽  
pp. 55
Author(s):  
Tri Handoko Seto

Telah dilakukan análisis temporal dan spasial data tekanan udara dan curah hujan menggunakan data hasil pengukuran dengan AWS dan penakar hujan manual di DASLarona, Sulawesi Selatan. Dari hasil analisis temporal nampak bahwa tekanan udarapermukaan cenderung turun saat pertumbuhan awan. Penurunan tekanan menjadi energi yang digunakan untuk menarik massa udara di sekitarnya. Ketika terjadi hujan maka tekanan udara menjadi tinggi akibat adanya pendinginan masa udara. Dari analisisspasial nampak bahwa daerah yang memiliki tekanan lebih rendah cenderung memilikicurah hujan yang lebih tinggi dibandingkan dengan daerah-daerah di sekitarnya. Hasilpenelitian ini bisa dijadikan referensi bahwa ketika terjadi pertumbuhan awan di suatulokasi maka aliran udara akan masuk menuju lokasi pertumbuhan awan. Semakin kuat pertumbuhan awannya maka semakin kuat tarikan massa udara dari sekitarnya. Dalam teknologi modifikasi cuaca, usaha memperkuat pertumbuhan awan mungkin bisa dijadikan salah satu strategi untuk menarik massa udara atau awan-awan yang lebih kecil ke area dengan pertumbuhan awan yang kuat. Namun masih perlu dilakukan penelitian lebih lanjut untuk membuktikan hipotesa ini.Temporal and spatial data analysis of air pressure and rainfall data using AWS andrain gauges in the watershed of Larona, South Sulawesi has been done. From theresults it appears that surface air pressure tends to fall when clouds develop. Pressuredecreasing became energy which is used to draw air mass from the vicinity. When itrains then the air pressure increased due to the cooling of the air. From the spatialanalysis it appears that areas with lower pressure tend to have higher rainfall than thesurrounding areas. The results of this study can be used as a reference that when thereis cloud growth in a location, air flow will go to the location of cloud growth. The stronger cloud’s growth the stronger pull of the surrounding air mass. In weather modification technology, strengthen the growth of cloud technique may be used as one strategy to attract the mass of air or clouds of smaller clouds to the area with strong growth. But it still needs to do further research to prove this hypothesis.

2014 ◽  
Vol 72 (1) ◽  
Author(s):  
Syerrina Zakaria ◽  
Nuzlinda Abd. Rahman

The objective of this study is to analyze the spatial cluster of crime cases in Peninsular Malaysia by using the exploratory spatial data analysis (ESDA). In order to identify and measure the spatial autocorrelation (cluster), Moran’s I index were measured. Based on the cluster analyses, the hot spot of the violent crime occurrence was mapped. Maps were constructed by overlaying hot spot of violent crime rate for the year 2001, 2005 and 2009. As a result, the hypothesis of spatial randomness was rejected indicating cluster effect existed in the study area. The findings reveal that crime was distributed nonrandomly, suggestive of positive spatial autocorrelation. The findings of this study can be used by the goverment, policy makers or responsible agencies to take any related action in term of crime prevention, human resource allocation and law enforcemant in order to overcome this important issue in the future. 


Ecology ◽  
1996 ◽  
Vol 77 (5) ◽  
pp. 1642
Author(s):  
Michael W. Palmer ◽  
Trevor C. Bailey ◽  
Anthony C. Gatrell

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