M Pramono Hadi, M Pramono
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Pemahaman Karakteristik Hujan Sebagai Dasar Pemilihan Model Hidrologi (Studi Kasus di Das Bengawan Solo Hulu)

Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The research was conducted at the Upper Bengawan Solo Catchment, which was categorized as critical catchment. The problems of flood and drought became the main issue, and need to be handled sooner, therefore it need hydrological modelling to coupe the problems. As we know that the role of rainfall as an input to the model is very significant parameter in generating output (discharge), then the objective of this research is to know the rainfall characteristics. The rainfall distribution in the research area can be known by doing the spatial analysis, especially using Kriging method. It does the rainfall mapping for a certain duration to describe the spatial rainfall distribution. It uses the rainfall data from 20 rainfall stations with 5 minutes interval recording. It does the inter-stations correlation analysis on the amount of rainfall and the distance of inter-stations. The significant level used in this study is 5%. The result shows the tendency that the more of the station number decreased, the smaller the rainfall correlation coefficient inter-stations are. It can be meant that the numbers of the rainfall stations in catchment area have optimum number of gauge. The coverage area for each station is 13 km2 when we use 5’s minute interval data. Most of the rainfall which have intensity > 30 mm/hr occur at minute 20th to 125th. As much as 17.5% of these rainfall have randomly distribution. There is a significant relationship (R2=65.2%) between daily maximum rainfall and minimum values of inter-stations correlation coefficient Base on above results it is very important to consider that in chosing the size of catchment area for hydrological modeling it should be related with its rainfall chracteristics.

Pemahaman Karakteristik Hujan Sebagai Dasar Pemilihan Model Hidrologi (Studi Kasus di Das Bengawan Solo Hulu)

Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The research was conducted at the Upper Bengawan Solo Catchment, which was categorized as critical catchment. The problems of flood and drought became the main issue, and need to be handled sooner, therefore it need hydrological modelling to coupe the problems. As we know that the role of rainfall as an input to the model is very significant parameter in generating output (discharge), then the objective of this research is to know the rainfall characteristics. The rainfall distribution in the research area can be known by doing the spatial analysis, especially using Kriging method. It does the rainfall mapping for a certain duration to describe the spatial rainfall distribution. It uses the rainfall data from 20 rainfall stations with 5 minutes interval recording. It does the inter-stations correlation analysis on the amount of rainfall and the distance of inter-stations. The significant level used in this study is 5%. The result shows the tendency that the more of the station number decreased, the smaller the rainfall correlation coefficient inter-stations are. It can be meant that the numbers of the rainfall stations in catchment area have optimum number of gauge. The coverage area for each station is 13 km2 when we use 5’s minute interval data. Most of the rainfall which have intensity > 30 mm/hr occur at minute 20th to 125th. As much as 17.5% of these rainfall have randomly distribution. There is a significant relationship (R2=65.2%) between daily maximum rainfall and minimum values of inter-stations correlation coefficient Base on above results it is very important to consider that in chosing the size of catchment area for hydrological modeling it should be related with its rainfall chracteristics.

INVESTIGATING THE EFFECT OF CONSERVATION TECHNIQUES ON THE LAND DEGRADATION OF TROPICAL CATCHMENT PRONE TO LANDSLIDE

Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 14, No 2 (2017): July 2017
Publisher : Universitas Negeri Semarang

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Abstract

Land degradation in Serayu watershed is a major concern in central Java and in Indonesia. As part of a broader effort to develop a land degradation assessment tool in tropical area, this study implemented a process-based watershed hydrology to assess the effect of conservation technique upon land degradation by using PCRaster. STARWARS was used to assess the watershed hydrology in the area based on their land use/ land cover, soil, and slope profiles. The results from STARWARS were used as inputs for the PROBSTAB model to simulate the slope stability in the area. DEM scenario were used, they are with terraces and without terraces.The models show that the landuse practice in the study area work like two edges of sword. The promoting of bench terrace can be reducing the risk of soil erosion but in the other hands it increases in the risk of landslide. From the slope-stability modeling, we can see that the terrace increases the pore-water pressure significantly which lead to the ideal conditions for the failures. The extremely high intensity rainfall, in the other hands, may build a sharp increase of pore-water pressure. The increasing probability of failure might cause the soil erosion even worse. Therefore, in order to make the terrace practice is effective to control the land degradation process; the terrace has to be well maintained.

Analisis Laju Sedimen DAS Serayu Hulu dengan Menggunakan Model SWAT

Majalah Geografi Indonesia Vol 32, No 1 (2018): Maret 2018
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

Wilayah DAS Serayu Hulu merupakan DAS prioritas yang memerlukan langkah pengelolaan yang komprehensif. Aplikasi model Soil and Water Assessment Tool (SWAT) dapat digunakan sebagai media untuk  perencanaan konservasi ataupun evaluasi respon DAS (debit aliran permukaan, sedimen dan pencemaran sungai). Tujuan utama dari penelitian ini adalah menjalankan model SWAT di DAS Serayu Hulu untuk mengetahui laju sedimen di wilayah ini. Pemodelan SWAT membutuhkan sejumlah input parameter berupa relief, tanah, tutupan lahan dan pengelolaan lahan. Pedogeomorfologi digunakan sebagai batas satuan tanah karena tidak tersedianya peta tanah di wilayah penelitian. Hasil Penerapan model SWAT di DAS Serayu Hulu menghasilkan nilai yang cukup memuaskan, hal ini ditunjukkan nilai R2 mencapai 0,94. Hasil pemodelan SWAT dengan menggunakan data selama 10 tahun (2004-2013) menunjukkan bahwa DAS Serayu Hulu memiliki rerata hasil sedimen sebesar 1.926.900 ton/tahun. Sub DAS 8,9 11, 17, 18, dan 19 merupakan penghasil sedimen tertinggi di DAS Serayu Hulu dengan hasil sedimen 43.931– 121.434 ton/ha/tahun.

PERSEPSI PETANI TERHADAP BANJIR DI LAHAN SAWAH: STUDI KASUS DI KABUPATEN KENDAL DAN KABUPATEN DEMAK, PROVINSI JAWA TENGAH

MAJALAH ILMIAH GLOBE Vol 14, No 1 (2012)
Publisher : Badan Informasi Geospasial

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Abstract

Ancaman banjir pada lahan sawah dapat menyebabkan berkurangnya luas panen dan produksi beras. Banjir genangan di wilayah pantura Jawa Tengah ini disebabkan oleh tingginya curah hujan dan/atau pasang air laut (rob). Penelitian ini dilakukan untuk mengetahui persepsi petani terhadap banjir genangan pada lahan sawah. Persepsi masyarakat petani yang digali mencakup persepsi mengenai kejadian banjir pada lahan sawah baik yang disebabkan karena hujan atau rob, atau gabungan antara keduanya, dan dampaknya terhadap produksi padi. Persepsi petani merupakan dasar perilaku adaptasi yang dilakukan petani. Adaptasi mencakup segala usaha yang dilakukan sebagai upaya untuk mengurangi risiko, dari risiko pengurangan produksi padi hingga hilangnya seluruh lahan sawah karena tergenang secara permanen. Penelitian ini dilakukan dengan melakukan observasi lapangan dan wawancara, dengan sampel terpilih dan terbatas pada petani di wilayah yang terkena banjir. Hasil dari penelitian ini menunjukkan bahwa petani di wilayah penelitian telah melakukan adaptasi guna mengurangi risiko kerugian karena banjir sesuai dengan persepsi dan kapasitasnya yang diwujudkan dalam pembangunan infrastruktur penahan banjir dan/atau modifikasi bentuk pola tanam.Kata Kunci: Sawah, Banjir Genangan, Persepsi ABSTRACTFlood inundation over the paddy field threatens the rice production by degrading the harvest area and rice production. Flood inundation in the area of study occurs due to high rainfall and/or sea water tide. This research aims to study farmers’ perception towards the flood inundation over the paddy field. Farmers’ perception investigated includes perception towards the occurrences of flood inundation resulted from rainfall and/or sea water tide and the impact to the rice production. The farmers’ perception is the based of farmers adaptation behaviour. Meanwhile, the adaptation investigated includes any efforts that have been carried out to reduce the risks, from the reduction of rice production into the lost of paddy field due permanent inundation. This research carried out by doing field observation and interview, with sample selected purposively inclusively to farmers in the flooded area. The result shows that the farmers have been performed adaptation based on their perception and capacity by building flood control and modification of crop calendars.Keyword: Paddy Field, Flood Inundation, Perception