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All Journal Jurnal Pembangunan Wilayah dan Kota Forum Geografi
Suprapto Dibyosaputro
Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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Journal : Forum Geografi

 1 
Lahar at Kali Konto after the 2014 Eruption of Kelud Volcano, East Java: Impacts and Risk Dibyosaputro, Suprapto; Dipayana, Gilang Arya; Nugraha, Henky; Pratiwi, Kartika; Valeda, Hogy Prima
Forum Geografi Vol 29, No 1 (2015): Forum Geografi
Publisher : Forum Geografi

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Abstract

Five days after the Kelud Volcano eruption of 13 February 2014, lahar occurred in several channels of the Volcano. Rainfall with intensity of 26 mm/hour mobilized pyroclastic material from the upper slopes of Kelud Volcano down the channel during 3.5 hour. Using this eruption as a case study, the aims of this paper are (1) to study the geomorphic impact of lahars and (2) to study future hazards and risks due to the potential of lahar source material and lahar repose area. To reach these two goals, we use both primary and secondary data. The primary data comprises an integration of remote sensing, GIS approach, and fieldwork control, in order to investigate the geomorphic impacts of lahars. Secondary data were collected through interviews and statistical approach in villages, in order to determine their perception to the risk of lahar. Morphogenic processes such as riverbank erosion, channel-widening and riverbed downcutting took an important role in generating the impact of lahar in Kali Konto. The medial and distal areas were affected more largely affected than the proximal area. This major impacts have been river widening and buried crop field inside of the channel. This result allowed us to provide recommendation to population living along those areas at risk, in order to be prepared against the eventuality of potentially large and destructive lahars.
A concept of Surveying and Mapping Vulnerability and Flood Hazard (with Hydro-Geomorphological Approach) Dibyosaputro, Suprapto
Forum Geografi Vol 12, No 1 (1998)
Publisher : Forum Geografi

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Abstract

The general event of natural process phenomena on lowland areas is flood as an effect of the overtooping stream water over natural levees and inundate the area of surrounding the river. Most of the lowland surround the rivers is used by man for settlements, agriculture land, high way, and other activities to support their life intensively. Therefore flood is not only the physical phenomena but also a socio – economic phenomena. One of the way to understand the spatial distribution of flood prone areas an be done by means of survey and mapping of the flood susceptibility and hazard using an hydro- geomorphological approach. The fluvial landform units on the lowlands reflect the effet of the geomorphological and hydrological processes in the past. Therefore those phenomena can be applied to explain the recent flood characteristics such as inundation  area, depth and flood duration, as well as flood frequencies and sources of floods. This explanation can be used as the starting point of the existing information which an be used as a basic survey and mapping of the flood suspectibility and hazard. The exiting of the interaction between man and natural event (flood) information, can also be applied as a fundament to define the hazard levels of every landform units own flood susceptibility levels.
Morphometry Characteristics of Riverbed Sediment Grains as Basic Indicator Management of River Valley Environment (Case Study of Bogowonto River, Central Java) Dibyosaputro, Suprapto
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This research aims to propose the usage of riverbed sediment grains roundness/flatness as basic indicator of river valley management. It is based on the evaluation of anomalous morphometry condition of sediment grains and valley condition along the river as one indicator of the stability of the riverbank of the river valley. This stability express the physical condition of the river valleys. In this paper, we provide methodological explanation as well as a case study in Bogowonto River. Analysis of the morphometry of sediment grain on riverbed from upstream to downstream as well as the relationship between the distance of the upstream and morphometry of sediment grains along Bogowonto River were conducted. Finally, we evaluated the anomalous condition as indicator of different environmental condition of the riverbank. We conducted three stages survey processes: preparation, fieldwork, and post-fieldwork. The preparation phase includes site selection, depiction of the main river channel of Bogowonto River, and the determination of the sample location. The distance between each sampling site was 5 km along Bogowonto River. The results show that there is anomalous morphometry of sediment grains found in the study area. The reason is that the channel of the segment of the river flowing over rocky riverbed of breccia along the 7.5 km, with hard and sharps edge grained of rock particles. This is accompanied by landslide the occurrence in the upper segment of the river. This is why the value of roundness and flatness indexes are changed significantly become lower value than the previous segment. This condition can be implemented to be used as indicator to basic management of landslide along a certain segment which indicated by the changing in roundness and flatness index values of the sediment grains. 
Morphometry Characteristics of Riverbed Sediment Grains as Basic Indicator Management of River Valley Environment (Case Study of Bogowonto River, Central Java) Dibyosaputro, Suprapto
Forum Geografi Vol 29, No 2 (2015): December 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i2.1128

Abstract

This research aims to propose the usage of riverbed sediment grains roundness/flatness as basic indicator of river valley management. It is based on the evaluation of anomalous morphometry condition of sediment grains and valley condition along the river as one indicator of the stability of the riverbank of the river valley. This stability express the physical condition of the river valleys. In this paper, we provide methodological explanation as well as a case study in Bogowonto River. Analysis of the morphometry of sediment grain on riverbed from upstream to downstream as well as the relationship between the distance of the upstream and morphometry of sediment grains along Bogowonto River were conducted. Finally, we evaluated the anomalous condition as indicator of different environmental condition of the riverbank. We conducted three stages survey processes: preparation, fieldwork, and post-fieldwork. The preparation phase includes site selection, depiction of the main river channel of Bogowonto River, and the determination of the sample location. The distance between each sampling site was 5 km along Bogowonto River. The results show that there is anomalous morphometry of sediment grains found in the study area. The reason is that the channel of the segment of the river flowing over rocky riverbed of breccia along the 7.5 km, with hard and sharps edge grained of rock particles. This is accompanied by landslide the occurrence in the upper segment of the river. This is why the value of roundness and flatness indexes are changed significantly become lower value than the previous segment. This condition can be implemented to be used as indicator to basic management of landslide along a certain segment which indicated by the changing in roundness and flatness index values of the sediment grains. 
Lahar at Kali Konto after the 2014 Eruption of Kelud Volcano, East Java: Impacts and Risk Dibyosaputro, Suprapto; Dipayana, Gilang Arya; Nugraha, Henky; Pratiwi, Kartika; Valeda, Hogy Prima
Forum Geografi Vol 29, No 1 (2015): July 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i1.793

Abstract

Five days after the Kelud Volcano eruption of 13 February 2014, lahar occurred in several channels of the Volcano. Rainfall with intensity of 26 mm/hour mobilized pyroclastic material from the upper slopes of Kelud Volcano down the channel during 3.5 hour. Using this eruption as a case study, the aims of this paper are (1) to study the geomorphic impact of lahars and (2) to study future hazards and risks due to the potential of lahar source material and lahar repose area. To reach these two goals, we use both primary and secondary data. The primary data comprises an integration of remote sensing, GIS approach, and fieldwork control, in order to investigate the geomorphic impacts of lahars. Secondary data were collected through interviews and statistical approach in villages, in order to determine their perception to the risk of lahar. Morphogenic processes such as riverbank erosion, channel-widening and riverbed downcutting took an important role in generating the impact of lahar in Kali Konto. The medial and distal areas were affected more largely affected than the proximal area. This major impacts have been river widening and buried crop field inside of the channel. This result allowed us to provide recommendation to population living along those areas at risk, in order to be prepared against the eventuality of potentially large and destructive lahars.
Total Suspended Load and Sediment Yield of Kayan River, Bulungan District, East Kalimantan Dibyosaputro, Suprapto
Forum Geografi Vol 19, No 2 (2005): December 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i2.4842

Abstract

This research was carried out the the drainage system of Kayan river, Bulungan District, East Kalimantan. The purpose of the research were to study the physical conditions of the Kayan catchment area, calculate the suspended sediment load, and to define the total sediment yield of Kayan River. Observation method were used in this research both of direct field observation as well as laboratory observation. Data acquired in this study were include of climatic data, geology, geomorphology, soil and land cover data. Besides also rain-fall data, temperature, river discharge and suspended sediment load. The total sediment yield were calculated by mean of mathematical and statistical analysis especially of linier regression analysis. The result of the research show that total the sediment yield of Kayan River with drainage area of 6,329.452 km² is about 236,921.25 m³/km²/year. The interesting result of the statistical analysis was that the existing negative correlation between river discharge and suspended sediment load. It is the effect of the location of discharge and suspended measurement. This condition caused by sea tide effect on river discharge at the apex delta. During high tide water river trend rising up on discharge but not on suspended sediment load. Instead, also existing setting down processes takes places of the suspended sediment load into the river bottom upper stream and the apex.
Inventarisasi Data Ungkungan Fisik Daerah Rencana Kawasan Wisata Jimbaran-Kedonganan Bali Dibyosaputro, Suprapto
Forum Geografi Vol 7, No 1 (1993): July 1993
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v7i1.4792

Abstract

Daerah Jimbaran dan Kedonganan adalah merupakan salah satu daerah yang direncanakan untuk kawasan pariwisata pantai Pulau Bali. Tujuan penelitian ini adalah mengadakan inventarisasi data lingkungan fisik daerah tersebut yang meliputi iklim, geomorfologi, tanah, hidrologi, dan oceanografi. Adapun metode penelitian yang digunakan adalah metode observasi yakni pengamatan, pengukuran dan pencatatan terhadap aspek-aspek tersebut baik langsung di lapangan maupun di laboratorium. Hasil penelitian menunjukan babwa wilayaj Jimbaran dan Kedonganan sebagian besar mempunyai potensi lingkungan fisik yang baik sebagai kawasan wisata pantai. Subu rata-rata adalah 27.05° C dengan subu tertinggi terjadi pada Bulan Oktober yakni 29° C dan suhu terendah pada bulan Agustus yakni 26° C. Hujan rata-rata setahun adalah 1240 mm dengan bulan-bulan basah antara Desember hingga April, sedang bulan-bulan lainnya adalah bulan kering. Secara geomorfologis daerah penelitian merupakan teluk dimana dari tempat ini dapat melihat panorama alam yang indah yakni terbenamnya matahari di waktu sore. Daerah ini juga merupakan bagian Ieher dari suatu tombolo. Sebelah selatan daerah penelitian berbatasan dengan cliff dari batu gamping yang menambah keindahan panorama alami. Kedalaman air tanah bervariasi antara 4-7.65 meter dengan tebal air tanah antara 0.65-1.00 meter. Potensi air tanah sebesar 5.913.600 mm3, dengan pH air di beberapa daerah 7 karena adanya intrusi air taut. Potensi tersebut tidak mencukupi untuk kebutuhan air untuk keperluan hotel-hotel di wilayah ini sebingga harus menambah air dari luar kawasan tersebut. Wilayah teluk Jimbaran-Kedonganan ini mempunyai tinggi gelombang antara 0.25-1.60 meter, frekuensi gelombang antara 10-15 buah gelombang per menit, lebar gisk antara 75-100 meter, dengan kemiringan gisk 5-7. Di dalam teluk Jimbaran Kedonganan ini terdapat adanya teluk dan tanjung yang kecil yang letaknya selalu berpindah-pindah. Hal ini berbahaya bagi perenang di laut karena arus balik kuat (rip cureent) ke arah laut berpindah-pindah tempat pada periode waktu tertentu.
A concept of Surveying and Mapping Vulnerability and Flood Hazard (with Hydro-Geomorphological Approach) Dibyosaputro, Suprapto
Forum Geografi Vol 12, No 1 (1998)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v12i1.482

Abstract

The general event of natural process phenomena on lowland areas is flood as an effect of the overtooping stream water over natural levees and inundate the area of surrounding the river. Most of the lowland surround the rivers is used by man for settlements, agriculture land, high way, and other activities to support their life intensively. Therefore flood is not only the physical phenomena but also a socio – economic phenomena. One of the way to understand the spatial distribution of flood prone areas an be done by means of survey and mapping of the flood susceptibility and hazard using an hydro- geomorphological approach. The fluvial landform units on the lowlands reflect the effet of the geomorphological and hydrological processes in the past. Therefore those phenomena can be applied to explain the recent flood characteristics such as inundation  area, depth and flood duration, as well as flood frequencies and sources of floods. This explanation can be used as the starting point of the existing information which an be used as a basic survey and mapping of the flood suspectibility and hazard. The exiting of the interaction between man and natural event (flood) information, can also be applied as a fundament to define the hazard levels of every landform units own flood susceptibility levels.
Co-Authors Agung Setyawan Gilang Arya Dipayana, Gilang Arya Henky Nugraha, Henky Hogy Prima Valeda, Hogy Prima Kartika Pratiwi Sri Rum Giyarsih Totok Gunawan