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All Journal Indonesian Journal of Geography Jurnal Sains & Teknologi Modifikasi Cuaca
Sudibyakto Sudibyakto
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Earth & Planetary Sciences Education

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PENGARUH FAKTOR IKLIM TERHADAP POLA SEBARAN INTEGRAL KONSENTRASI KONTAMINAN RADIOAKTIF TAHUNAN DARI CEROBONG REAKTOR KARTINI YOGYAKARTA KE UDARA LINGKUNGAN SEKITARNYA Mondjo Mondjo; Sudibyakto Sudibyakto
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 1 No. 2 (2000): December 2000
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v1i2.2131

Abstract

This research is to study the impact of climate factors and environmental risk due tooperation of The Nuclear Reactor of Kartini that is proportional to the annual integratedconcentration of the radioactive contaminant into the air of surrounding areas A research has been done to design a mathematical model to relate the annual integrated concentration of the radioactive contaminant with the radioactive contaminant released from the Reactor of Kartini (the rate the effluents are released, type of the radioactive contaminant, dimension of stack), and climatological factor (wind direction, wind speed, solar radiation percentage) . The result shown that the maximum of annual integrated concentration of the radioactive contaminant of Argon-41 had been on the decrease but variation of the annual climatological factor was not significant with the distribution of it. The map of the annual integrated concentration of Argon-41 shown up the maximum of 3 the annual integrated concentration of Argon-41 was 0,6 μ Ci/m . The area where had the 3 value of the annual integrated concentration of Argon-41 of 0,4 – 0,6 μ Ci/m (equal to the -5 3mean concentration of Argon-41 of 4,04 – 6,06 × 10 μ Ci/m ) for the direction of 60° onthe distance of 200 – 1075 m, the direction of 30° on the distance of 200 – 800 m, and the direction of 90° on the distance of 300 – 575 m. The contribution of contaminant released from the stack of the Reactor of Kartini was lower than the natural radioactivity so the operation of the Reactor of Kartini was not significant with the degree of theenvironmental radioactivity.
Integration Of Spa Tio- Temporal Analysis Of Rainfall And Community Information System To Reduce Landslide Risk In Indonesia Sudibyakto Sudibyakto
Indonesian Journal of Geography Vol 40, No 1 (2008): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2250

Abstract

Indonesia is vulnerable to many type of disasters including natural and anthropogenic disasters. Indonesian seasonal rainfall also shows inter annual variation. Sediment-related disaster such as landslide is the mostji-equent disaster occurred and significantly was impacted to natural, human. and social environment. Although. many disaster mitigation e.Oorts have been conducted to reduce disaster risk there are still urgently need to improve the early 1varning .\~ystem by communicating the risk into local community. Integration qf spatialtemporal analysis qf rainfall and disaster management information !o~vstem would be required to improve the better disaster management in Indonesia. Application of Disaster A1anagement Information System in the study area will presented including evacuation map that used by the local community.
ANALYZING RUNOFF DYNAMICS THROUGH PARAMETERIZING A HYDROLOGICAL MODEL IN A WATERSHED: A CASE STUDY IN UPPER SERAYU BASIN, CENTRAL JAVA PROVINCE, INDONESIA Adhi Nurul Hadi; Sudibyakto Sudibyakto; Dhruba Shrestha
Indonesian Journal of Geography Vol 43, No 1 (2011): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2293

Abstract

This research constructed a hydrological model by means of available data,hydrological equations, and GIS program to find out the runoff dynamic on thestudy area. The runoff dynamic was analyzed by describing runoff on different landcover types, figuring the correlation between hydrological component and runoff,calculating the sensitivities of the hydrological components to runoff, andidentifying the response of runoff to possible land cover change. The modelresulted that the highest runoff occurred on built up area and the lowest occurredon cultivation area. Infiltration was also the hydrological component that mostlyinfluenced runoff. Replacing forest, shrub, and plantation by cultivation greatlyreduced runoff up to 49 %. Enlarging forest area increased runoff about 12 %.Based on those findings, the hydrological component having the strongestcorrelation with runoff gave the most influence to runoff change, and enlargingforest area does not always decrease runoff.
SPATIOTEMPORAL CHARACTERISTICS OF EXTREME RAINFALL EVENTS OVER JAVA ISLAND, INDONESIA Supari Supari; Sudibyakto Sudibyakto; Janneke Ettema; Edvin Aldrian
Indonesian Journal of Geography Vol 44, No 1 (2012): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2391

Abstract

The patterns and trends of extreme daily rainfall within period of 1981 – 2010 have beenanalyzed for Java Island, Indonesia particularly East Java Province. A set of extreme indicesrecommended by WMO were calculated using high quality data from 84 rain stations toexpress the frequency and intensity of those events. The spatial patterns was identified bymapping climatological mean of indices while temporal trends was assessed using the nonparametricMann-Kendal test. The study found that the spatial pattern of extreme rainfallevents over East Java Province is generally characterized by low frequency and intensity inthe coastal area, and high frequency and intensity in the mountainous area. The dominantfinding from trend assessment is not-significant trend. However, the consistently significanttrend was observed in some districts. Rain stations in District of Ponorogo, Ngawi,Bojonegoro, Gresik and Sumenep showed significant negative trend for almost all indiceswhereas significant positive trend was found in District of Surabaya and Pasuruan.
Urban Risk Assessment of Lahar Flows in Merapi Volcano (Study Case: Muntilan Urban Area, Central Java) Cosmas Bambang Sukatja; Sudibyakto Sudibyakto; RPGA Voskuil
Indonesian Journal of Geography Vol 46, No 1 (2014): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3222.564 KB) | DOI: 10.22146/ijg.4991

Abstract

The objective of the research was to analyse probability of lahar flows occurrence in Muntilan urban area,Central Java. By using integrated methods, which involve the numerical simulation program, Geographic InformationSystem (GIS), Remote Sensing (RS) and field verification to produce lahar flows Hazard Map and Risk Map. Muntilanurban area located at western flank of Merapi volcano, and in down stream of Lamat river. The river is Lahar River thatis endangering from Merapi volcano, which flowing down to cuts a cross of that area. Therefore, Muntilan urban areais vulnerable area from lahar flows disaster. Lahar flows, generally occur during intense rainfall on saturated volcanicdeposit in upper stream of river or wall of volcano. Lahar flows are extremely dangerous especially to those living invalley areas near a volcano, which can undercut banks and cause houses destruction situated on the banks, and canbury and destroy resident, structures, infrastructure facilities including roads and bridges. Meanwhile, development ofMuntilan urban area that caused many illegal settlements appears surrounding that area. Occasionally, un-benefit peopleconstructing house in disaster prone area, such as down stream of river side that have lahar flows risk. The research wasconcluded that lahar flow occurrence in 100 years return period will be buried the Muntilan urban area. With the methodsintegrating of GIS, RS, field verification can be done analysing of lahar flows hazard map, and risks map to producerisk assessment in Muntilan urban area.
Co-Authors Adhi Nurul Hadi Cosmas Bambang Sukatja Dhruba Shrestha Edvin Aldrian Janneke Ettema Mondjo Mondjo RPGA Voskuil Supari Supari