Suprapto Dibyosaputro
Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada

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JASA DAN ETIKA LINGKUNGAN UNTUK PENGENDALIAN AIR DAN BANJIR SEBAGAI DASAR PENGELOLAAN DAS SERANG Setyawan, Agung; Gunawan, Totok; Dibyosaputro, Suprapto; Giyarsih, Sri Rum
JURNAL PEMBANGUNAN WILAYAH & KOTA Vol 14, No 4 (2018): JPWK Vol 14 No 4 Desember 2018
Publisher : Magister Pembangunan Wilayah dan Kota,Undip

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (749.59 KB) | DOI: 10.14710/pwk.v14i4.21096

Abstract

Penelitian ini merupakan kasus di DAS Serang Kabupaten Kulonprogo D.I. Yogyakarta. Bertujuan untuk menilai sebaran spasial jasa lingkungan untuk pengaturan tata air dan banjir sebagai dasar untuk Pengelolaan kelestarian sumberdaya air DAS di DAS Serang, Kabupaten Kulonprogo D.I. Yogyakarta. dengan metode dengan pendekatan jasa lingkungan menggunakan dua variable penaksir yaitu penggunaan lahan dan ecoregion. Masing-masing variable dinilai jasa lingkungannya terhadap pengaturan tata air dan banjir, yang kemudian disintesis menggunakan metode AHP menghasilkan nilai koefisien jasa lingkungan pengaturan tata air dan banjir. Dari nilai koefisien tersebut diolah dan dianalisis dengan teknis GIS menghasilkan sebaran spasial nilai jasa lingkungan pengaturan tata air dan banjir yang kemudian dilakukan pembagian kelas menjadi 5 kelas jasa lingkungan pengaturan tata air dan banjir yaitu kelas sangat tinggi, tinggi, sedang, rendah dan sangat rendah. Hasil dari penelitian ini menunjukkan bahwa: untuk DAS Serang Kabupaten Kulonprogo D.I. Yogyakarta pada daerah hulu berpontensi sebagai jasa pengaturan tata air dan banjir. Terutama di Kecamatan Kokap dengan persentase luasan jasa lingkungan pengaturan tata air dengan kelas sangat tinggi sebesar 85% dari luas Kecamatan Kokap. Sedangkan untuk etika lingkungan DAS serang Kab Kulonprogo D.I. Yogyakarta terdapat tiga kelas etika lingkungan di wilayah DAS yaitu untuk wialayah Hulu mempunya kelas Etika Lingkungan Rendah, Wilayah tengah kelas etika lingkungan sedang dan wilayah hilir kelas etika lingkungan.
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.
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. 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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. 
LONGSORLAHAN DI DAERAH KECAMATAN SAMIGALUH, KABUPATEN KULON PROGO, DAERAH ISTIMEWA YOGYAKARTA Dibyosaputro, Suprapto
Majalah Geografi Indonesia Vol 16, No 2 (2002): September 2002
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.13232

Abstract

ABSTRAK Penelitian ini dilakukan di daerah Kecamatan Samigaluh dan sekitarnya, Kabupaten Kulon Progo, Daerah Istimewa Yogyakarta, dengan tujuan untuk mempelajari, mengklasifikasi, dan memetakan daerah penelitin ke dalam peta geomorfologi dan peta unit medan, mempelajari daerah-daerah potensial terjadi longsor lahan dan menyusun peta bahaya longsor lahan, serta mengevaluasi longsor lahan setiap unit medan. Berbagai data yang dikumpulkan meliputi curah hujan, kemiringan lereng, jenis batuan, kedalaman pelapukan batuan, banyaknya dinding terjal, tebal solum tanah, tekstur dan permeabilitas tanah, penggunaan lahan dan kerapatan vegetasi penutup. Metode yang digunakan adalah metode survey dengan teknik pengambilan sampel secara berstrata, dengan unit medan sebagai unit analisisnya. Unit medan diperoleh dengan menumpang-susunkan peta-peta geomorfologi, lereng, dan penggunaan lahan. Penentuan kelas bahaya longsor lahan menggunakan teknik pengharkatan terhadap masing-masing parameter medan, dan kemudian menjumlahkannya untuk masing-masing parameter medan tersebut. Selanjutnya dari jumlah harkat tersebut digunakan sebagai dasar untuk penentuan tingkat bahaya longsorlahan pada setiap unit medan, yang akhirnya disusun peta bahaya longsorlahan. Hasil penelitian menunjukkan bahwa daerah penelitian dapat dikelompokkan ke dalam 32 unit medan. Hasil analisis tingkat bahaya longsorlahan yaitu kelas II (tingkat bahaya rendah) sebanyak 5 unit medan yang didominasi oleh kompleks dataran alluvial dan teras sungai dan perbukitan solusional berbatu gamping koral; kelas III (tingkat bahaya longsorlahan sedang) sebanyak 6 unit medan pada sebagian unit medan kompleks dataran alluvial dan teras sungai dan unit medan dari bentuklahan perbukitan solusional berbatugamping. Kelas IV (tingkat bahaya longsorlahan tinggi) terdiri dari 14 unit medan pada pegunungan denudasional dan berbatuan breksi dan perbukitan denudasional berbatuan tuff. Tingkat bahaya longsorlahan sangat tinggi (Kelas V) sejumlah 5 unit medan yaitu pada pegunungan denudasional berbatuan breksi, dan perbukiyan denudasional berbatuan tuff. Unit-unit medan yang mempunyai klas bahaya longsorlahan tinggi (Kelas IV) dan sangat tinggi (Kelas V) terjadi pada unit medan dengan kemiringan lereng (8-25%), terjal (20-40%) dan sangat terjal (<40%), kedalaman pelapukan batuan/tanah dalam hingga sangat dalam (>100cm). Penggunaan lahan tegalan, kebun campuran, dan permukiman, serta sebagian kecil sawah yang pengolahannya dilakukan dengan cara penterasan.
Dampak Perubahan Penggunaan Lahan terhadap Perubahan Runoff di Daerah Aliran Sungai (DAS) Bedog Yogyakarta Yudha, Sanggara; Sudibyakto, Sudibyakto; Dibyosaputro, Suprapto
Majalah Geografi Indonesia Vol 27, No 2 (2013): September 2013
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1723.972 KB) | DOI: 10.22146/mgi.13426

Abstract

ABSTRAK DAS Bedog merupakan salah satu DAS di Yogyakarta yang daerah aliran sungainya mengalami proses pengembangan wilayah perkotaan. Proses perkembangan wilayah perkotaan di DAS Bedog ini terjadi dalam kurun waktu 10 tahun terakhir. Parameter dari adanya proses pengembangan wilayah perkotaan di DAS Bedog adalah terjadinya peningkatan peningkatan tipe penggunaan lahan “permukiman”, yang semula sebesar 15,29% di tahun 2004 menjadi 16,94% tahun 2008 dan 17,72% pada tahun 2010 atau meningkat sebesar 0,4% per tahun.Tujuan utama dari penelitian ini adalah menganalisis dampak perubahan penggunaan lahan terhadap perubahan runoff dan merumuskan simulasi/skenario penggunaan lahan dalam menurunkan runoff di DAS Bedog menggunakan metode Curve Number-USSCS (CN-USSCS). Berdasarkan perhitungan metode CN-USSCS pada tahun 2004, 2008 dan 2010, akibat dampak dari perubahan penggunaan lahan menghasilkan ketebalan runoff sebesar 1.353,0 mm (66% dari jumlah hujan/tahun), 1.277,2 mm (55,5% dari jumlah hujan/tahun), dan 1.536,4 mm (57,6% dari jumlah hujan/tahun). Penggunaan lahan “permukiman” dan “lahan kosong” berkontribusi terbesar dalam peningkatan ketebalan runoff di DAS Bedog, dikarenakan memiliki nilai CN yang tinggi dan berarea luas.Validasi terhadap metode CN-USSCS menggunakan uji statistik, T-test dihasilkan nilai T-test sebesar 0,00 dan 0,092 dibawah nilai T-tabel sebesar 1,67 dan 1,71 serta nilai koefisien determinasi (R2) diatas 0,5 yang berarti metode CN-USSCS dapat diterapkan di DAS Bedog untuk memprediksi ketebalan runoff.Hasil rumusan skenario perubahan penggunaan lahan di DAS Bedog bahwa perubahan penggunaan lahan untuk 6 tahun ke depan (tahun 2016) mengalami perubahan ketebalan runoff sebesar 4% dari tahun 2010 (skenario 1). Penurunan ketebalan runoff di DAS Bedog dapat dilakukan dengan peningkatan luasan hutan berupa kebun campuran dan tumbuhan perdu (semak belukar) di daerah Bantul sebesar > 50% dari luas DAS Bedog (skenario 4). ABSTRACT Bedog watershed is one of the watersheds in the area of Yogyakarta through the process of urban development. The process of urban development in the Bedog watershed this happened in the past 10 years. The parameters of the process of urban development in the Bedog watershed is the increase in land use "settlement" from 15,29% (2004) to  16,94% (2008) and 17,72% in 2010 or an increase of 0.4% per year.The main objective of this research is is to analyze the impact of land use change on runoff and formulate of the simulation / scenarios of land use in reducing runoff in the Bedog watershed using the Curve Number -USSCS (CN-USSCS). Based on the calculation of CN-USSCS in 2004, 2008 and 2010, due to the impact of changes in land use resulted runoff of 1353.0 mm (66% of the amount of rain / year), 1277.2 mm (55.5% of the amount of rain / year), and 1536, 4 mm (57.6% of the amount of rain / year). Settlement and Bareland contributed to the greatest increase in runoff in the Bedog watershed, due to having a high value of CN and has a large area.Validation of the methods of CN-USSCS using statistical test, T-test produced values of 0.00 and 0.092 below the T-table values of 1.67 and 1.71, and the coefficient of determination (R2) above 0.5, which means CN-USSCS method can be applied in the Bedog watershed to predict the runoff.The results of the formulation of land use change scenarios in Bedog watershed that the change in land use for the next 6 years ( 2016) to change the runoff by 4% from the 2010 (scenario 1). Decrease runoff in the Bedog watershed to do with the increase in forest area in the form of mixed garden and herba plants (shrubs) in Bantul for >50% of the total Bedog watershed (scenario 4).
Karakter Geoarkeologis dan Proses Budaya Prasejarah Zona Poros Ponjong – Rongkop di Blok Tengah Yuwono, Jarwo Susetyo Edy; Dibyosaputro, Suprapto; Adji, Tjahyo Nugroho
Majalah Geografi Indonesia Vol 28, No 1 (2014): Maret 2014
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2437.229 KB) | DOI: 10.22146/mgi.13064

Abstract

ABSTRAK Penelitian ini dilakukan di Zona Poros Ponjong - Rongkop, yaitu bagian dari Blok Tengah Gunungsewu di Pegunungan Selatan Jawa, yang posisinya diapit oleh dua depresi bekas danau purba, yaitu Ledok Wonosari dan Ledok Baturetno. Morfologinya berupa punggungan perbukitan karst berarah utara-selatan antara daerah Ponjong dan Rong-kop, membentuk semacam poros hampir tegak lurus terhadap bentangan umum Gunungsewu. Bagian paling utara ber-batasan dengan pegunungan non-karst dan memiliki topografi tertinggi di Blok Tengah Gunungsewu, sehingga menjadi wilayah hulu bagi sungai-sungai bawahtanah di Gunungkidul. Melalui beberapa survei ditemukan sejumlah 56 gua yang memiliki potensi arkeologis, tujuh di antaranya sudah diekskavasi dan terbukti menyimpan jejak-jejak hunian prase-jarah dari Kala Pleistosen Akhir - Holosen Awal. Pendekatan geoarkeologis sebagai studi gabungan antara arkeologi dan geomorfologi, dilakukan untuk membangun model-model integral mengenai hubungan sistematik antara manusia dengan bentanglahan karst Gunungsewu di area penelitian. Dua hal yang menjadi tujuan utama penelitian ini adalah: Pertama, menjelaskan karakter geoarkeologis Zona Poros Ponjong - Rongkop sebagai perpaduan antara aspek-aspek geomorfologis (morfologi, morfogenesis, morfokronologi, dan morfoaransemen) dan aspek-aspek arkeologis (distri-busi gua dan potensi arkeologisnya). Tujuan ini dicapai melalui penilaian dan pemetaan distribusi potensi gua sebagai situs arkeologis, kemudian menganalisis hubungannya dengan aspek-aspek geomorfologis setempat. Kedua, menjelas-kan proses budaya prasejarah, yaitu bentuk dinamis dari budaya penghunian gua beserta faktor-faktor yang mempen-garuhinya. Metode untuk mencapai tujuan ini adalah dengan menganalisis konteks data arkeologis dan stratigrafi lantai gua yang pernah diekskavasi. Sintesis kajian atas kedua capaian tujuan ini memberikan penjelasan integral atas karakter geoarkeologis dan proses budaya prasejarah di area penelitian, dalam konteks dan perubahan bentanglahan, pembentu-kan dan perubahan situs, serta konteks stratigrafi. ABSTRACT  This thesis presents results of geoarchaeological research conducted in the Ponjong - Rongkop Axis Zone which is situated in the Central Block of Gunungsewu, a karstic area of the southern mountains of Java. This zone run north to south from Ponjong to Rongkop Districts forming an axis nearly perpendicular to the general orientation of Gunungsewu and is flanked by two former ancient lake depressions, the so-called Wonosari Basin and Baturetno Basin. Geomorphologically, it consists of a hilly karstic area. At the northern end lays a non-karst mountain which becomes the highest topography in the Central Block of Gunungsewu and the upstream region for the underground rivers of the Southern Mountains (Gunun-gkidul). Surveys in the zone has located at least 56 caves bearing archaeological potential. Seven of them were excavated and the results demonstrate prehistoric human occupation from the Late Pleistocene to Early Holocene. This research is addressed to contruct a model for human and landscape relationship in the Ponjong - Rongkop Axis Zone. Geoarchaeolog-ical approach, as an interdiciplinary study involving archaeology and geomorphology, is carried out to attain the research objectives which are two folds. Firstly, to explain the geoarchaeological character of the Ponjong - Rongkop Axis Zone that have been formed as a combination of some geomorphological aspects (morphology, morphogenetic, morphochronology, and morpho-arrangement) and archaeological aspects (distribution of caves with archaeological potential). This objective is achieved through assesment and mapping of the potential caves in the zone with regard to the local geomorphological aspects. Secondly, to explain the process of prehistoric culture, namely the cultural dynamic of the occupied caves and factors that influenced it. To attain this second objective, contextual analysis of the archaeological data and its stratigraphy which have been obtained from the archaeological excavations are conducted. Synthesis of the geoarchaeological characters and prehistoric cultural process provides an integrated explanation on the relationship between human and landscape in the re-search area as shown in three aspects: the landscape context and its changes, the formation and changes of the archaeological sites as well as the stratigraphic context.
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.