M. Pramono Hadi
Fakultas Geografi UGM

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APPLICATION INTEGRATION METHODS ON LANDSAT ETM + TO DETERMINE EARTHQUAKE POTENTIALS IN PALU GRABEN

Indonesian Journal of Geography Vol 42, No 1 (2010): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

This study aims to assess the ability of the integration method at LandsatETM + imagery in recognizing object fault, main fault and secondary fault in PaluGraben. Mapping of fault and calculate earthquake potential, based of fault that isfound in Graben of Palu. The image used in this study is Landsat ETM +.Techniques used to process Landsat ETM + is a method of integration. LandsatETM+ imagery processed with ENVI software 4.4, while the mapping of faults anddetermining of length using ArcGIS 9.2.The potential of earthquakes is calculatedfrom the length of faults found in the Graben of Palu. Results obtained showed thatthe patterns of lineament as a picture of fault in the Palu Graben can be extractedfrom Landsat ETM +. Lineament of fault is seen clearly on Landsat ETM + imageprocessed with integration method and band combination, 45PC1_8. Faults arearranged in the form of map. There are 66 faults found at research sites.Magnitude earthquake 5,5 SR can be produced from the fault with a length greaterthan or equal to 9 km. If each faults contributes the same to earthquakeoccurrence, the potential incidence of earthquake with magnitude greater than orequal to 5.5 SR in the Graben of Palu is 33.8%, while the magnitude is smallerthan 5.5 SR is 66.2%. The largest magnitude that can occur in Palu Graben, 7.1SR. These results indicate that the potential earthquake destructive (≥ 5.5 SR) ofapproximately 33.8%.

KAJIAN KETERSEDIAAN AIR METEOROLOGIS UNTUK PEMENUHAN KEBUTUHAN AIR DOMESTIK DI PROVINSI JAWA TENGAH DAN DIY

Jurnal Bumi Indonesia Volume 2, Nomor 2, Tahun 2013
Publisher : Fakultas Geografi UGM

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Abstract

Penelitian ini bertujuan untuk mengetahui sebaran ketersediaan air meteorologis, sebaran kebutuhan air domestik dan sebaran kekritisan air domestik di Provinsi Jawa Tengah dan DIY. Metode yang digunakan yaitu analisis deskriptif kuantitatif dan analisis spasial. Dalam penelitian ini, aspek curah hujan dan jumlah penduduk digunakan sebagai dasar utama dalam analisis. Curah hujan bulanan rata-rata digunakan untuk menghitung nilai ketersediaan air pada masing-masing desa di wilayah penelitian, sementara itu jumlah penduduk digunakan untuk menghitung nilai kebutuhan air domestiknya. Dengan begitu tingkat kekritisan air pada masing-masing desa di wilayah penelitian dapat diketahui yakni dengan membandingkan nilai keduanya.Hasil penelitian menunjukan kekritisan air domestik terjadi pada daerah dengan kepadatan penduduk yang tinggi dan atau memiliki curah hujan yang relatif rendah. Desa-desa tersebut diantaranya terdapat pada beberapa kota seperti di Tegal, Semarang, Surakarta, Yogyakarta, dan beberapa kabupaten yakni Kudus, Tegal, dan Rembang.Kata Kunci: Curah Hujan, Jumlah Penduduk, Kektitisan Air Domestik

DIFFERENCES IN DISASTER RESPONSE DUE TO VARYING DATA AVAILABILITY A SERIOUS GAME FOR FLOODING DISASTER RESEARCH IN SURAKARTA, INDONESIA

Indonesian Journal of Geography Vol 43, No 1 (2011): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

This research aims to propose a method to study the effect of data availability indisaster-response study. This research focused on how to quantify the relationbetween data availability and actions taken by decision maker. The more specifictopic is represented as disaster response due to varying data availability usingSerious Game method in the Public Works Unit Surakarta. The serious gameprovide scenario to gather data about several issues. Digital elevation model,flood alert stage decision making, and damage prediction information wereneeded. This research also could promote as a complement the other method forcollecting data and decision-making training program for flood manager. Theresult of analysis has shown that there are differences of responses based on thedata availability. Better responses can be achieved by the improvement of dataavailability. It also proves that the number of correct decision was raised by theimprovement of data availability.

A GIS MODELLING APPROACH FOR FLOOD HAZARD ASSESSMENT IN PART OF SURAKARTA CITY, INDONESIA

Indonesian Journal of Geography Vol 43, No 1 (2011): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

This research is aimed to assess the flood hazard in part of Surakarta usinghydrodynamic modelling. Flo2D software is used to simulate the flood for 10, 25and 100 year return period. The modeling results include two flood parameters, i.ewater depth and flow velocity. A comparison was made in flood hazard mappingbetween single parameter and multi parameters. The multi parameters hazardmaps improve the reliability of the hazard class delineation. The impact assessmentis done in two point of view, human safety and property damage. The furtherimpact assessment is done by calculating the number of buildings affected by flood.

PENGGUNAAN AIR DOMESTIK DAN WILLINGNESS TO PAY AIR BERSIH PDAM DI KECAMATAN TEMANGGUNG KABUPATEN TEMANGGUNG

Jurnal Bumi Indonesia Volume 1, Nomor 3, Tahun 2012
Publisher : Fakultas Geografi UGM

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Abstract

Penggunaan air domestik dapat berupa penggunaan air untuk memenuhi keperluan keluarga. Daerah penelitian memiliki kondisi airtanah bervariasi dan kebanyakan masyarakat mengunakan sumber air PDAM. Tujuan penelitian ini (1) untuk mengetahui kualitas fisik airtanah dan penggunaan air domestik, (2) Mengetahui kemauan penduduk membayar layanan air bersih PDAM (Willingness To Pay). Metode yang digunakan adalah survei wawancara dengan menggunakan kuesioner dengan teknik analisis tabulasi frekuensi. Penentuan kualitas fisik airtanah dilakukan pengukuran langsung dan analisis laboratorium. Analisis data yang digunakan adalah analisis deskriptif dan analisis spasial. Hasil penelitian menunjukkan kualitas fisik airtanah di Kecamatan Temanggung cukup berpengaruh terhadap nilai Willingness To Pay. Sementara itu, penggunaan air di daerah penelitian sebesar 96,21 liter/orang/hari, tidak berpengaruh besar terhadap nilai Willingness To Pay. WTP air bersih PDAM untuk pelanggan PDAM tergolong tinggi, dengan bersedia membayar pada tarif antara Rp.550,00 – Rp.700,00/1-10m3 pertama di atas tarif yang ditawarkan PDAM. WTP air bersih PDAM untuk pelanggan sumur tergolong rendah dengan bersedia membayar pada tarif Rp.350,00 – Rp.500,00/1-10m3 pertama.Kata kunci: penggunaan air domestik, kualitas fisik airtanah, PDAM, Willlingness To Pay, Kecamatan Temanggung

Groundwater resources mapping for small island using Geoelectrical Technique the case study of Ternate Island

Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

The measurement of 2D geo-electrical using Wenner Alpha configuration was conducted in the shore line of northern part of Ternate island, in order to know the depth of interface and to analyze the aquifers in conjunction with estimation of ground water potential. Water quality analysis is also conducted in some dug wells, such as in situ water temperature, electrical conductivity, pH, turbidity, dissolved oxygen, and salinity.Due to laboratory analysis, the values of measured parameters of water quality from some dug wells meets to the standards referred, especially for drinking water. The result of interpretation from geo-electrical data showed the depth of interface less than 10m.  From a drilled well data near shore line, indicate about 5m deep of interface. Base on geo-electrical survey, water quality analysis and field observation can be concluded that Ternate Island has limited potential of ground water, especially related to amount of fresh ground water. Which is now days, no alternative source yet of clean water for domestic use.  

Simulasi Penggunaan Lahan dan Transportasi Massal untuk Pemodelan Pelayanan Jalan di Koridor Jalan Godean

Majalah Geografi Indonesia Vol 31, No 2 (2017): September 2017
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

AbstrakRendahnya tingkat pelayanan jalan menjadi salah satu permasalahan yang ada di Koridor Jalan Godean. Permasalahan tersebut dapat di atasi dengan pengendalian penggunaan lahan serta penyediaan angkutan massal. Penelitian ini dilakukan untuk memodelkan tingkat pelayanan jalan jika terjadi perubahan penggunaan lahan sesuai dokumen Rencana Detail Tata Ruang (RDTR) serta pemodelan jika dilakukan pembangunan angkutan massal. Metode yang digunakan dalam penelitian ini yaitu metode kuantitatif. Metode kuantitatif digunakan untuk menghitung nilai VCR (Volume - Capacity Ratio) eksisting, nilai VCR dengan pemodelan pembangunan sesuai RDTR, ketentuan nilai intensitas bangunan ideal, dan nilai VCR dengan pemodelan pembangunan angkutan massal. Hasil penelitian menunjukkan bahwa tingkat pelayanan jalan pada kondisi eksisting masih sangat rendah dan jauh dari kondisi ideal. Kondisi ini diperakan sama dengan yang terjadi di masa mendatang, bahkan tingkat pelayanan jalan di sebagian segmen jalan akan semakin menurun. Potensi volume kendaraan tidak dapat ditampung oleh ruas jalan yang ada. Ketentuan intensitas bangunan perlu diturunkan sebesar 44,5% di segmen 2 dan sebesar 74,9% di segmen 4 dari nilai koefisien nilai bangunan (KLB) yang sudah direncanakan. Selain menurunkan intensitas bangunan, tingkat pelayanan jalan dapat ditingkatkan dengan pembangunan angkutan massal. Hasil pemodelan menggunakan angkutan massal menunjukkan bahwa moda transportasi yang masih memungkinkan untuk dibangun di Koridor Jalan Godean yaitu monorail dan trem dengan model jalur trem tidak eksklusif. Namun, jika pembangunan angkutan massal yang dipilih berupa trem, maka masih diperlukan penurunan ketentuan intensitas bangunan sekitar 37,8% di segmen 2 dan sekitar 68,78% di segmen 4 dari nilai KLB yang sudah direncanakan. AbstractThe low road service of Godean Corridor has become problematic. Since this problem can be dealt with by controlling land use and providing feasible mass transportation, this research aimed to model the level of road service if the land use change occurred in line with the Detailed Spatial Plan (DSP) and in the case of mass transportation development. The research used a quantitative method to calculate the existing Volume-Capacity Ratio (VCR), the VCR in DSP-based development model, the prerequisites for ideal building intensity, and the VCR in mass transportation-based development model. The results showed that the current road service was very low and far from ideal. This condition was estimated to persist in the future. The road services in some segments were also estimated to decline continuously. The current road could not accommodate the existing and potential of the traffic volume. The stipulation of building intensity has to be reduced by 44.5% in segment 2 and 74.9% in segment 4 from the previously planned building value coefficient. Aside from reducing the building intensity, the road service can also be increased by developing mass transportation. The results of mass transportation modeling showed that the feasible modes of transportation on the corridor were monorail and tram with non-exclusive tramway model. However, if the selected transportation is tram, then the building intensity has to be reduced by 37.8% in segment 2 and 68.78% in segment 4 from the predefined building value coefficient.

Pengaruh Potensi Sumberdaya Air Terhadap Pola Penggunaan Kebutuhan Domestik di Kecamatan Eromoko Kabupaten Wonogiri

Majalah Geografi Indonesia Vol 30, No 2 (2016): September 2016
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

Saat ini masyarakat di beberapa daerah di Indonesia mengalami kekurangan air akibat kekeringan/krisis air yang disebabkan oleh musim kemarau yang panjang. Penyediaan air bersih di Indonesia masih sering terjadi masalah, yaitu tingkat pelayanan air minum, kualitas dan kuantitas air serta pasokan dan distribusinya. Air yang dikonsumsi oleh masyarakat terutama untuk kebutuhan domestik seperti air minum menjadi permasalahan di Indonesia. Masalah tersebut adalah kekurangan pasokan air bersih. Berkaitan dengan hal tersebut, penelitian ini dilatar belakangi seberapa besar potensi sumberdaya air digunakan untuk pemenuhan kebutuhan domestik penduduk Kecamatan Eromoko. Tujuan penelitian adalah (1) menganalisis potensi sumberdaya air Kecamatan Eromoko; (2) menganalisis kebutuhan domestik penduduk Kecamatan Eromoko; (3) melakukan evaluasi ketersediaan air terhadap kebutuhan air domestik di Kecamatan Eromoko.Data primer yang digunakan adalah data wawancara jumlah kebutuhan domestik penduduk, kedalaman muka airtanah, elevasi, kualitas air dan data debit air. Data sekunder meliputi data bor, data kontur elevasi dan data pendukung lainnya. Sampel data primer ditentukan secara sistematik, proposional dan purposif. Tujuan (1) dicapai dengan menentukan kualitas dan kuantias air. Kuantitas air didapatkan dari debit dinamis airtanah, mataair, sungai bawah tanah. Kualitas air didapatkan dari hasil uji laboratorium sampel air terhadap nilai pada peraturan mengenai kualitas air. Tujuan (2) dicapai dengan menghitung jumlah kebutuhan air untuk domestik penduduk Kecamatan Eromoko. Tujuan (3) dicapai dengan membandingkan kuantitas sumberdaya air yang tersedia dengan jumlah kebutuhan air untuk domestik penduduk Kecamatan Eromoko. Hasil penelitian diuraikan secara deskriptif kuantitatif, deskriptif kualitatif serta komparatif. Hasil penelitian meliputi (1) potensi sumberdaya air daerah penelitian memiliki nilai debit dinamis sebesar 121 juta lt/hari atau 121 juta m3/hari dan 69% kualitas sumber air dalam kondisi baik. (2) jumlah kebutuhan air untuk domestik sebesar 6.840.076 l/hari atau 6.840 m3/hari. (3) potensi sumberdaya air dapat mencukupi kebutuhan domestik penduduk karena jumlah kebutuhan domestik lebih kecil daripada debit dinamis airtanah dengan kualitas air kondisi baik

RISIKO BANJIR PADA LAHAN SAWAH DI SEMARANG DAN SEKITARNYA

MAJALAH ILMIAH GLOBE Vol 17, No 1 (2015)
Publisher : Badan Informasi Geospasial

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Abstract

Lahan sawah di wilayah Semarang dan sekitarnya berada pada dataran rendah pesisir yang rawan banjir, baik yang disebabkan oleh curah hujan yang tinggi maupun rob. Analisis risiko banjir diperlukan karena banjir merupakan ancaman bagi lahan sawah. Banjir dapat menyebabkan berkurangnya produktivitas lahan sawah, bahkan lahan sawah akan rusak dan tidak dapat ditanami padi jika tergenang banjir secara permanen. Penelitian ini bertujuan untuk menganalisis risiko banjir genangan pada lahan sawah berdasarkan kondisi bahaya dan kerentanannya. Lingkup penelitian mencakup analisis bahaya, kerentanan, dan risiko banjir genangan pada lahan sawah. Data yang digunakan dalam penelitian ini terdiri dari peta Rupa Bumi Indonesia (RBI), peta Sistem Lahan, citra penginderaan jauh resolusi tinggi, data curah hujan, debit sungai, tinggi pasang air laut, data statistik Potensi Desa (PODES), data statistik pertanian dan laporan banjir. Analisis kerawanan banjir merupakan gabungan antara kerawanan banjir genangan yang disebabkan oleh hujan dan rob. Analisis kerentanan banjir menggunakan data statistik PODES 2008 dan laporan kejadian banjir. Hasil penelitian menunjukkan bahwa banjir genangan rob merupakan ancaman dan berisiko pada pengurangan lahan sawah di wilayah ini. Selama periode 1994 – 2009 lahan sawah telah berkurang seluas 8.508,50 ha. Sebagian lahan sawah yang tergenang rob secara permanen telah dialihfungsikan ke penggunaan lain.Kata kunci: banjir genangan, rob, sawah, risikoABSTRACTPaddy field in Semarang and its surrounding areas are situated in low-lying flood-prone coastal area, whether caused by heavy rainfall and high tide. Flood risk analysis is required because flooding in this area is considered as a threat to the paddy field. Floods can lead to reduction of the paddy fields‟ productivity, even damaging and cannot be planted with rice if flooded occurred permanently. This study aimed to analyze the risk of flood inundation in paddy fields based on hazard and vulnerability factors. The scope of the research includes analysis of hazards, vulnerabilities, and risks of flood inundation in the paddy fields. The data used in this study consisted of topographic and land systems maps, high-resolution satellite remote sensed imageries, rainfall data, river discharge, tides, and statistical data of Village Potential (PODES), statistical data of agriculture and flood reports data. The analysis of flood vulnerability is a combination of flood vulnerability caused by high rainfall and tides. The flood vulnerability analysis conducted by using PODES 2008 statistical data and flood incidencereports. The results showed that the tidal flood inundation is the main threat and provide risk on the reduction of the paddy fields in this area. During the period of 1994 – 2009, the paddy field has been reduced by 8,508.50 hectares. Some of the paddy fields that have been flooded permanently due to tides have been converted to other uses.Keywords: flood inundation, tidal flood, paddy field, risk

Water Quality Modeling For Pollutant Carrying Capacity Assessment Using Qual2Kw In Bedog River

Indonesian Journal of Geography Vol 50, No 1 (2018): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Considering the abundance of potential pollutant sources along Bedog River, i.e. highly dense residential areas, agricultural lands, and industrial areas, this study aimed to quantitatively assess the Pollutant Load (PL) and Pollutant Carrying Capacity (PCC) of the river based on Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD)parameters. The assessment employed a water quality modeling using Qual2Kw that provided not only the comprehensive values of PL and PCC but also the amount of PL that should be reduced to meet the PCC of every river segment. Water sampling and primary parameter measurement were conducted purposively in seven observation points, which included one point source and six non-point sources (river segments). River segments were determined according to the characteristics of land use and drainage system. Descriptive, graphic, and spatial analyses on water quality modeling show that the COD and BOD of Bedog River (2.24 km) indicates a small presence of PL compared to the river’s PCC. The PCC allows additional pollutant loads of 566.95 kg/day or 0.024 ton/hour BOD and 22,965.12 kg/day or 0.96 ton/hour COD. However, a high BOD in segments 3, 5, and 6 and a high COD in segment 5 imply the needs for PL reduction.