Sudibyakto Sudibyakto
Faculty of Geography, Universitas Gadjah Mada

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MODEL PERENCANAAN DAN PENGELOLAAN LINGKUNGAN BERBASIS MASYARAKAT KASUS : BENTANGLAHAN KAWASAN TEMBALANG SEMARANG

JURNAL PRESIPITASI Vol 9, No 1 (2012): Vol 9, No 1 (2012)
Publisher : Department of Environmental Engineering

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Abstract

One of mayor requirement in environmental system planning and management is to predict the condition  in  the  future.  Model  can  be  used  to  simplified  the  prediction  and  arrangement  of anything.  There  are  four  steps  as  a  guidance  for  making  a  model,  i.e.:  model  formulation, parameter identification, parameter estimation, and model validation. The result being expected after applying those four steps is a good model that consistent with study objective, simple, and applicable.

Application of Vector Auto Regression Model for Rainfall-River Discharge Analysis

Forum Geografi Vol 29, No 1 (2015): Forum Geografi
Publisher : Forum Geografi

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Abstract

River discharge quantity is highly depended on rainfall and initial condition of river discharge; hence, the river discharge has auto-correlation relationships. This study used Vector Auto Regression (VAR) model for analysing the relationship between rainfall and river discharge variables. VAR model was selected by considering the nature of the relationship between rainfall and river discharge as well as the types of rainfall and discharge data, which are in form of time series data. This research was conducted by using daily rainfall and river discharge data obtained from three weirs, namely Sojomerto and Juwero, in Kendal Regency and Glapan in Demak Regency, Central Java Province. Result of the causality tests shows significant relationship of both variables, those on the influence of rainfall to river discharge as well as the influence of river discharge to rainfall variables. The significance relationships of river discharge to rainfall indicate that the rainfall in this area has moved downstream. In addition, the form of VAR model could explain the variety of the relationships ranging between 6.4% - 70.1%. These analyses could be improved by using rainfall and river discharge time series data measured in shorter time interval but in longer period.

A Participatory Evacuation Map Making Towards Sustainable Urban Heritage Kotagede, Yogyakarta

Forum Geografi Vol 29, No 1 (2015): Forum Geografi
Publisher : Forum Geografi

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Abstract

This research aims at development of Participatory Evacuation Map Making (PEMM) for Kotagede, Yogyakarta – Indonesia. The research area is one of an important cultural heritage sites in Indonesia which is subjected towards earthquake hazard. The preliminary observation revealed that the area is a densely populated area, which characterized by dense wooden building structure, narrow street and minimum information of evacuation route which increase their vulnerability potentials. This leads to the idea of developing the PEMM to improve their awareness and preparedness during disaster events and creates sustainable condition for local livelihood security. The method develops within this research is actually a lesson learn from Ritsumeikan University, that has developed CSR for integration disaster management into heritage sites at Kyoto Prefecture. Their CSR covers several activities such as developing disaster information via vending machine and tourism map. Since Yogyakarta and Kyoto are engaged in “Sister City Development Program”, hereafter Universitas Gadjah Mada tries to do similar thing. Map making is an alternative prior to community experience in map making is rather frequent compare to vending machine habit. The preliminary finding of this research indicates that the Kotagede community has been involved in several map making activity, such as “Green Map” and “Rehabilitation Sites Map”.  However, they have not yet any experience to create any map which includes information such as evacuation route, fire extinguisher, shelter information center and important meeting points. An improved critics from this research is to include meeting points level. As we all aware off, each meeting point have significant carrying capacity, thereby in the future a research on similar topics should add level and or category of meeting points. This is an important steppingstone for the research to conduct further research.

ANALISIS SIFAT AKUSTIK PAGAR PEMBATAS SEBAGAI PEREDAM BISING KENDARAAN BERMOTOR: SALAH SATU ALTERNATIF PENGENDALI BISING DI KOTA DENPASAR

Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 10, No 3 (2003)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Salah satu sumber kebisingan di daerah urban adalah kendaraan bermotor. Upaya untuk menghadapi kebisingan ini adalah mengendalikannya dengan cara memasang penghalang (barrier) dalam bentuk pagar, seperti misalnya pada arsitektur tradisional Bali. Penelitian ini bertujuan untuk melakukan studi tentang efektivitas berbagai macam pagar dan tentang efek pagar ini dan jumlah kendaraan bermotor terhadap tingkat kebisingan yang ditimbulkan. Penelitian ini dilaksanakan berdasar pada standar (ISO) R 1996, atau Equivalence of Noise Level of n number of sample. Penelitian ini mengadopsi sampling purposif untuk memilih jenis penghalang, dan berfokus pada objek berikut: (1) jenis pagar, (2) jarak dari sumber kebisingan, dan (3) jumlah jenis kendaraan. Efektivitas penghalang diekspresikan dalam jumlah reduksi kebisingan dari suatu kebisingan, baik menggunakan atau tidak menggunakan penghalang, serta koefisien keheningan (coefficient of muting) dari setiap penghalang. Tes untuk menganalisis data meliputi korelasi untuk mengetahui efektifitas penghalang, dan tes regresi untuk mengetahui hubungan antara jenis kendaraan dan tingkat kebisingan. Penelitian ini menemukan bahwa pagar masif merupakan pengurang kebisingan yang paling efektif diantara jenis-jenis pagar yang ada, dengan koefisien 0,12, tetapi jenis ini memiliki kekurangan elemen estetika dan memberikan kesan individualistik ditambah lagi bahwa struktur tersebut menghalangi pandangan apa yang terjadi diluar. Pagar yang berselang-seling dan ditutupi dengan vegetasi lebih baik ditinjau dari sisi estetika maupun fungsi fisik untuk mengurangi kebisingan, dengan koefisien 0,09. Relasi antara tingkat kebisingan dan jumlah kendaraan dapat diidentifikasi dengan menggunakan persamaan linier dengan memberikan jumlah kendaraan yang equivalen dengan jumlah sepeda motor.

DAMPAK PERKEMBANGAN KAWASAN PENDIDIKAN DI TEMBALANG SEMARANG JAWA TENGAH

Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 21, No 3 (2014)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Kawasan Tembalang merupakan salah satu wilayah pemekaran Kota Semarang Propinsi Jawa Tengah yang peruntukannya sebagai daerah pusat pengembangan pendidikan serta  pertumbuhan perumahan dan permukiman.  Pada tahap awal,  perkembangan kampus (kawasan pendidikan) di wilayah ini masih berdampak positif, khususnya pada pertumbuhan/perbaikan infrastruktur. Seiring dengan berjalannya waktu, ternyata mulai timbul dampak negatif pada lingkungan di sekitar kawasan kampus. Penelitian ini bertujuan untuk mengkaji tahapan dan bentuk perubahan yang terjadi di Kawasan Tembalang, serta mengkaji kondisi eksisting permukiman dan infrastruktur di wilayah ini. Metode penelitian ini menggunakan metode penelitian survei dengan menggabungkan metode kuantitatif dan metode kualitatif. Pengambilan sampel dilakukan dengan teknik purposive, teknik pengumpulan data menggunakan kuesioner, wawancara mendalam, dan observasi. Hasil penelitian menunjukkan bahwa terdapat beberapa tahapan dan bentuk perubahan yang terjadi selama empat tahap mencakup aspek kependudukan, matapencaharian, kondisi sosial-ekonomi-budaya, suplai kebutuhan, tata guna lahan, kondisi infrastruktur, dan lingkungan. Nilai skoring terhadap infrastruktur eksisting bernilai baik untuk kondisi transportasi dan drainase, kondisi bangunan dinilai buruk, dan kondisi persampahan dinilai sedang. 

OpenLISEM Flash Flood Modelling Application in Logung Sub-Catchment, Central Java

Indonesian Journal of Geography Vol 47, No 2 (2015): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

Juwana Catchment and Logung Sub-catchment in particular has been suffering several major past flood events with significant loss. This study conducted an assessment of flood risk by using OpenLISEM as physical soil and hydrological model to generate the single storm flash flood occurrences. The physical input data were collected from remote sensing image interpretation, field observation and measurement and literature review. There are three return periods chosen as scenarios that represent rainfall intensity in Logung Sub-Catchment. Model validation was done by adjusting initial moisture content and saturated hydraulic conductivity values to equate the calculated total discharge with the measured total discharge in several chosen dates. The results show increases in most of modeled hydrological parameter with respect to increasing of rainfall intensity.

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

PENGARUH FAKTOR IKLIM TERHADAP POLA SEBARAN INTEGRAL KONSENTRASI KONTAMINAN RADIOAKTIF TAHUNAN DARI CEROBONG REAKTOR KARTINI YOGYAKARTA KE UDARA LINGKUNGAN SEKITARNYA

Jurnal Sains & Teknologi Modifikasi Cuaca Vol 1, No 2 (2000): December 2000
Publisher : BPPT

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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.

TINGKAT KERENTANAN DAN INDEKS KESIAPSIAGAAN MASYARAKAT TERHADAP BENCANA TANAH LONGSOR DI KECAMATAN BANTARKAWUNG KABUPATEN BREBES

Majalah Geografi Indonesia Vol 26, No 1 (2012): Maret 2012
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

ABSTRAK Bantarkawung adalah salah satu kecamatan di Kabupaten Brebes yang sering terjadi bencana tanahlongsor. Oleh karena itu diperlukan pemetaan tingkat kerawanan dan kerentanan serta penilaian indeks kesiapsiagaan masyarakat. Tujuan dari penelitian ini adalah menentukan tingkat kerawanan, menentukan tingkat kerentanan, menilai indeks kesiapsiagaan masyarakat dan menganalisis hubungan tingkat kerawanan dengan nilai indeks kesiapsiagaan masyarakat terhadap bencana tanah longsor.  ABSTRACT Bantarkawung is one of the sub distict in Brebes regency which has many landslide occurences. Therefore, it is necessary to map susceptibility and vulnerability and to value community preparedness index. The aims of this research were to determine landslide susceptibility, determine vulnerability of element at risk (people and settlement) based on susceptibility zone toward landslide disaster, valuate community preparedness index, and analize relationship between susceptibility and community preparedness index toward landslide disaster. 

Kajian Luas Hutan Kota Berdasarkan Kebutuhan Oksigen, Karbon Tersimpan, dan Kebutuhan Air di Kota Yogyakarta

Majalah Geografi Indonesia Vol 24, No 2 (2010): September 2010
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

ABSTRAK KotaYogyakartaadalahkotayangberkembang.Perkembangankotaini sejalandenganjumlahpenduduk.Semakinbertambahjumlahpenduduk  maka akan semakin meningkat ke­­­butuhan mereka. Untuk memenuhi kebutuhan pendu­duk,makadibuatfasilitassepertiken­­daraanbermotor,jalandangedung. Fasi­litas ini akhirnya menggeser ruang terbuka hijau perkotaan. Akibatnya me­ning­­katkankonsumsioksigen,produksikarbondanber­ku­rangnyaareaserapan airhujan.Salahsatucarauntukmengatasimasalahiniadalahdenganmenjagadan meningkatkanruangterbukahijauyangberupahutankota. Penelitian ini bertujuan untuk menentukan konsumsi dan produksi kebu­tuhanoksigen,karbon,dankebutuhanairsertamemberikanrekomendasiluas hutankotayangharusditambahkanuntukmemenuhikebutuhanoksigen,karbon ter­simpan, dan kebutuhan air. Selain itu, penelitian ini bertujuan untuk menentukandis­tribusihutankotadanjenispohonyangharusditambahkanpada tingkatkeca­matan,menentukankesesuaianluashutankotaberdasarkanUndang- UndangNo­mor26Tahun2007dengankebutuhanoksigen,karbonter­simpandan kebutuhanairdanmemperkirakankebutuhanluashutankotapadatahun2010.KotaYogyakartadipilihsebagailokasipenelitian.Sampeldiambilsecara purposif. Variabelyangdiukurlangsungpadapenelitianadalahproduksioksigen pa­da daun dan biomassa pohon. Variabel yang tidak diukur langsung adalah kon­sumsioksigen, produksikarbon, kebutuhan air penduduk dan serapan air hu­tanko­ta.Analisadatapadaperhitunganluashutankotaberdasarkankebutuhan ok­si­gendankarbontersimpanmenggunakanMetodeGerarkis.Sedangkanuntuk kebutuhanairmenggunakanpersamaananalitik.KotaYogyakartamengalamikekuranganpasokanoksigen,areaserapan kar­bondanairdarihutankota.Hutankotaperluditingkatkanmenjadi22%dari luaswilayahuntukme­me­nuhiketigakebutuhanini.Terdapat7kecamatanyang perlu ditambahkan luas hutan ko­tanya yaitu Danurejan, Gedongtengen, Gond­oma­nan, Jetis, Kraton, Ngampilan, dan Pakua­laman dengan  jenis  pohon yangditanamadalah akasia,beringin,danbungur.ABSTRACT Yogyakarta is a growing city. Urban development is in line with the population. The increasing number of people will increase their needs. To meet the needs of the population, then made facilities such as vehicles, roads and buildings. This facility is finally shifting the urban green open space. As a result, increases oxygen consumption, carbon production and reduced water absorption area of rain. One way to overcome this problem is to maintain and increase green open space in the form of urban forest. This study aimed to determine the consumption and production needs oxygen, carbon, and water requirements and provide recommendations urban forest area which must be added to meet the needs of oxygen, carbon stored, and water needs. In addition, this study aims to determine the distribution of urban forest and tree species should be added to the district level, determine the suitability of forest area of the city is based on Law Number 26 Year 2007 needs oxygen, carbon stored and the need for water and estimating the needs of the city in the forest area Yogyakarta 2010.Kota year chosen as the study site. Samples taken purposif.Variabel measured directly in the research is the production of oxygen at the leaves and tree biomass. The variables are not measured directly is oxygen consumption, carbon production, the water needs of the population and water uptake urban forest. Analysis of data on the urban forest area calculation based on the need of oxygen and carbon stored using methods Gerarkis. As for the water needs using equation analitik.Kota Yogyakarta deficient supply of oxygen, carbon and water absorption area of the urban forest. Urban forest needs to be increased to 22% of the area for the third meet this need. There are seven districts that need to be added to its forest area is Danurejan, Gedongtengen, Gondomanan, Jetis, Kraton, Ngampilan, and Pakualaman with the type of trees planted are acacia, banyan, and bungur. KotaYogyakartaadalahkotayangberkembang.Perkembangankotaini sejalandenganjumlahpenduduk.Semakinbertambahjumlahpenduduk  maka akan semakin meningkat ke­­­butuhan mereka. Untuk memenuhi kebutuhan pendu­duk,makadibuatfasilitassepertiken­­daraanbe