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Estimation of Solar Radiation using Artificial Neural Network Suprayogi, Slamet
Forum Geografi Vol 18, No 1 (2004)
Publisher : Forum Geografi

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The solar radiation is the most important fator affeccting evapotranspiration, the mechanism of transporting the vapor from the water surface has also a great effect. The main objectives of this study were to investigate the potential of using Artificial Neural Network (ANN) to predict solar radiation related to temperature. The three-layer backpropagation were developed, trained, and tested to forecast solar radiation for Ciriung sub Cachment. Result revealed that the ANN were able to well learn the events they were trained to recognize. Moreover, they were capable of effecctively generalize their training by predicting solar radiation for sets unseen cases.

Contamination Vulnerability Analysis of Watershed for Water Quality Monitoring Widyastuti, Widyastuti; Suprayogi, Slamet
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

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This research is an early step to determine the location of rain gauge station for artificial neural network modeling. The implementation of this model is very useful for water quality monitoring. The objectives of this study are: 1) to study the distribution of watershed parameter, that are average annual precipitation, land use and land-surface slope, 2) to conduct vulnerability analysis of watershed contamination, 3) to determine the location of rain gauge station. The study was performed by weighing and rating method of watershed parameters. The vulnerability degree of watershedtocontaminationispresentedasvulnerabilityindex.Thisindexisdeterminedbyoverallsumofallmultiplication between score and weigh number of each parameter. All data manipulation and data analysis were performed by using Geographic Information System (ArcView version by 3.2). The vulnerability of watershed contamination map had been generated using overlay operation of parameters. The results show that vulnerability index are varies between 10 up to 40 intervals. Hence, the indexes were categorized into three levels of watershed vulnerability, namely low (10 â 20), moderate (20 â 30) and high (30 â 40). It is found that the study area covered more by high vulnerability of watershed to contamination. The zoning of watershed vulnerability meant to determine the rain gauge location. There are three rain gauge stations on the area that they are in a high vulnerability level, whereas the other vulnerability level area has one rain gauge station. Each level of vulnerability area is able to represent the source of contaminant that it maybe influence the water quality of Gajahwong river.

Estimation of Solar Radiation using Artificial Neural Network Suprayogi, Slamet
Forum Geografi Vol 18, No 1 (2004)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v18i1.602

The solar radiation is the most important fator affeccting evapotranspiration, the mechanism of transporting the vapor from the water surface has also a great effect. The main objectives of this study were to investigate the potential of using Artificial Neural Network (ANN) to predict solar radiation related to temperature. The three-layer backpropagation were developed, trained, and tested to forecast solar radiation for Ciriung sub Cachment. Result revealed that the ANN were able to well learn the events they were trained to recognize. Moreover, they were capable of effecctively generalize their training by predicting solar radiation for sets unseen cases.

Contamination Vulnerability Analysis of Watershed for Water Quality Monitoring Widyastuti, Widyastuti; Suprayogi, Slamet
Forum Geografi Vol 20, No 1 (2006): July 2006
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v20i1.1803

This research is an early step to determine the location of rain gauge station for artificial neural network modeling. The implementation of this model is very useful for water quality monitoring. The objectives of this study are: 1) to study the distribution of watershed parameter, that are average annual precipitation, land use and land-surface slope, 2) to conduct vulnerability analysis of watershed contamination, 3) to determine the location of rain gauge station. The study was performed by weighing and rating method of watershed parameters. The vulnerability degree of watershedtocontaminationispresentedasvulnerabilityindex.Thisindexisdeterminedbyoverallsumofallmultiplication between score and weigh number of each parameter. All data manipulation and data analysis were performed by using Geographic Information System (ArcView version by 3.2). The vulnerability of watershed contamination map had been generated using overlay operation of parameters. The results show that vulnerability index are varies between 10 up to 40 intervals. Hence, the indexes were categorized into three levels of watershed vulnerability, namely low (10 â 20), moderate (20 â 30) and high (30 â 40). It is found that the study area covered more by high vulnerability of watershed to contamination. The zoning of watershed vulnerability meant to determine the rain gauge location. There are three rain gauge stations on the area that they are in a high vulnerability level, whereas the other vulnerability level area has one rain gauge station. Each level of vulnerability area is able to represent the source of contaminant that it maybe influence the water quality of Gajahwong river.

Distribution of Accuracy of TRMM Daily Rainfall in Makassar Strait Giarno, G; Hadi, Muhammad Pramono; Suprayogi, Slamet; Murti, Sigit Heru
Forum Geografi Vol 32, No 1 (2018): July 2018
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v32i1.5774

This research aims to evaluate rainfall estimates of satellite products in regions that have high variations of rainfall pattern. The surrounding area of Makassar Strait have chosen because of its distinctive rainfall pattern between the eastern and western parts of the Makassar Strait. For this purpose, spatial distribution of Pearsonâs coefficient correlation and Root Mean Square Error (RMSE) is used to evaluate accuracy of rainfall in the eastern part of Kalimantan Island and the western part of Sulawesi Island. Moreover, we also used the contingency table to complete the parameter accuracy of the TRMM rainfall estimates. The results show that the performance of TRMM rainfall estimates varies depending on space and time. Overall, the coefficient correlation between TRMM and rain observed from no correlation was -0.06 and 0.78 from strong correlation. The best correlation is on the eastern coast of South West Sulawesi located in line with the Java Sea. While, no variation in the correlation was related to flatland such as Kalimantan Island. On the other hand, in the mountain region, the correlation of TRMM rainfall estimates and observed rainfall tend to decrease. The RMSE distribution in this region depends on the accumulation of daily rainfall. RMSE tends to be high where there are higher fluctuations of fluctuating rainfall in a location. From contingency indicators, we found that the TRMM rainfall estimates were overestimate. Generally, the absence of rainfall during the dry season contributes to improving TRMM rainfall estimates by raising accuracy (ACC) in the contingency table.

The Calculation Of Ngancar Batuwarna Reservoir, Wonogiri, Central Java Ulfa, Azura; Suprayogi, Slamet; Khoirullah, Evi Mivtahul
Media Komunikasi Geografi Vol 18, No 2 (2017)
Publisher : Universitas Pendidikan Ganesha

Evaluation of reservoir capacity is needed to find out how big the effective volume change of Ngancar Reservoir from the beginning of measurement until 2016. The purpose of this research is measuring volume of Ngancar Reservoir using bathymetry method with echosounder and calculating the remaining relative age of Ngancar Reservoir. Measurement topography of Ngancar Reservoir is done by bathymetry method of aquatic systematic random sampling method through certain path using echosounder. Analysis of reservoir capacity is done by calculating the volumes of Ngancar Reservoir and calculating the residual life of the reservoir relative. Fluctuation analysis of volume change was done by calculating the effective volume of reservoirs 1946-2016 and graphs. The calculation of the volume of the Ngancar Reservoir from the topographic map produces an effective volume value of 2016 is 1269905 m3 and the effective puddle area is 1393416 m2. An increase in sedimentation volume from 2011-2016 amounted to 296119.75 m3 with sedimentation rate was 59223.95 / year. With the assumption that the same landuse and sedimentation rate tend to be stable then the remaining age of Ngancar Reservoir is 21 years and 95 years old.

Analisis Kondisi Hidrologi terhadap Perkembangan Wilayah Perkotaan Studi Kasus DAS Kali Belik Yogyakarta Suprayogi, Slamet; Fatchurohman, Hendy; Widyastuti, M
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 2 (2019): July
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i2.22364

Perkembangan yang pesat di daerah Kota Yogyakarta memberikan berbagai konsekuensi dari sisi hidrologi. Perubahan lahan terbangun untuk memenuhi kebutuhan fasilitas fisik kota sangat cepat, seperti bangunan, jalan, dan tempat parkir. Kondisi ini akan merubah fungsi lahan sebagai satu kesatuan proses hidrologi, yakni lahan-lahan yang awalnya menyerap airÃ‚Â menjadi kedap air. Alih fungsi lahan yang diikuti oleh peningkatan aliran permukaan akan berpengaruh terhadap sumberdaya air baik dari segi kualitas maupun kuantitas. Hasil dari penelitian adalah terjadi perubahan penggunaan lahan di DAS Belik, yaitu berupa pengurangan lahan bervegetasi dan peningkatan lahan terbangun. Perubahan penggunaan lahan ini menyebabkan peningkatan koefisien aliran dan Curve Number (CN) di DAS Belik. Selain menyebabkan peningkatan koefisien aliran dan CN, peningkatan lahan terbagun juga menjadi sumber pencemar airtanah. Besarnya limbah domestik (detergen) dan sumber pencemar organik yang disebabkan konstruksi septictank yang terlalu dekat dengan sumur menyebabkan nilai phospat, nitrat, dan coliform jauh melebihi baku mutu air kelas 1. Kemudian arah aliran airtanah di DAS Belik bergerak dari hulu menuju ke arah hilir/selatan dengan potensi debit mencapai 104 liter/detik. Jika airtanah tercemar, maka konsentrasi pencemaran terbesar akan terjadi di bagian hilir DAS Belik.The consequence of rapid urbanization in the city of Yogyakarta lead to hydrological system change. Population and economic growth are the main reason for the increase in living place demand in the city of Yogyakarta. Landuse change is the impact of urban sprawl, which lead to the diminishing of groundwater resources and the increasing of overland flow. The extension of the built area that reaches the peri-urbans area and countryside will absolutely affect the quality and quantity of water resources.Ã‚Â The results show that landuse conversion occurred in several landuses in the sub-watershed of Belik. The main landuse change that detected from 2003-2012 is the diminishing of vegetated land and the increasing number of built area. Land conversion increased the run-off coefficient and Curve Number, that lead into the contamination of groundwater. The concentration of phosphate and coliform in almost all points exceeds the minimum standard of potable water. These results indicate that domestic wastewater and septic tank misconstructions play important role toward groundwater contamination. From the flownets construction, it shows that the groundwater flow from the northern part into southern part ofÃ‚Â Belik sub-watershed with potential discharge up to 104 liter/second. There is also possibility for groundwater contamination to extent and reach the downstream area. the water resources.

SUITABLE PROPORTION SAMPLE OF HOLDOUT VALIDATION FOR SPATIAL RAINFALL INTERPOLATION IN SURROUNDING THE MAKASSAR STRAIT Giarno, Giarno; Hadi, Muhammad Pramono; Suprayogi, Slamet; Murti, Sigit Heru
Forum Geografi Vol 33, No 2 (2019): December 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i2.8351

Spatial rainfall interpolation requires a number of suitable validation samples to maintain accuracy. Generally, the larger the areas which can be predicted, the better the interpolation. In addition, the data used for validation should be separated from the modelling data. Moreover, the number of samples determine optimally proportion the independent sites. The objective of this study is to determine the optimal sample ratio for holdout validation in interpolation methods; the Makassar Strait was chosen as the study location because of its daily rainfall variation. The accuracy of the sample selection is tested using correlation, root mean square error (RMSE), mean absolute error (MAE) and the indicators of contingency tables. The results show that accuracy depends on the ratio of the modelling data. Therefore, the more extensive the data used for interpolation, the better the accuracy. Otherwise, if the rain gauge data is separated according to province, there will be a variation in accuracy in the portion of independent samples. For rainfall interpolation, it is recommended to use a minimum 75% of data sites to maintain accuracy. Comparison between kriging and inverse distance weighting or IDW methods indicates that IDW is better. Moreover, rainfall characteristics affect the accuracy and portion of the independent sample.

Study of Groundwater Vulnerability to Pollution in the Tambakbayan Watershed in 2006 And 2017 Widyastuti, Margaretha; Suprayogi, Slamet; Hadi, M Pramono; Christanto, Nugroho; Tivianton, Tommy Andryan; Fadilah, Gita Oktaviani; Rahmawati, Laelina
Jurnal Pendidikan Geografi Gea Vol 21, No 1 (2021)
Publisher : Indonesia University of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v21i1.28368

Tambakbayan is one of the watersheds in Yogyakarta, Indonesia that is experiencing changes in land use. The research aims to analyze the distribution of intrinsic and specific groundwater vulnerability in the watershed that was influenced by land-use changes from 2006 to 2017. The data used are the RBI maps (containinh topographic and land-use information, 2006 and 2017), SRTM imagery, rainfall recorded at the Kambil, Prumpung, Bronggang, Santan, Gemawang, and Karang Ploso stations (2006-2017), soil map, and aquifer map. Land-use change was analyzed by comparing the RBI maps of 2006 and 2017; while the groundwater vulnerability was assessed with the Susceptibility Index a development of the DRASTIC method. The intrinsic groundwater vulnerability was generated based on physical conditions, including depth to the water table, aquifer media, groundwater recharge, and topography, while the specific groundwater vulnerability was a function of these attributes added with one anthropogenic parameter : land-use. Then, all of these parameters were analyzed with map ovelay. The results showed two levels of intrinsic vulnerability : low (2.18% of the watershed area) and medium (97.8%); and three classes of specific vulnerability : low (0.02%), medium (5.06%), and high (94.92%)in 2006. From 2006 through 2017, the areal percentage of the medium vulnerability Â increased, while that of the high vulnerability decreased due to the conversion of agricultural land to a reservoir in 2009.Â

Kajian Tipologi Pesisir Di Muara Sungai Pemali Kabupaten Brebes Provinsi Jawa Tengah Saputro, Eko Ali; Gunawan, Totok; Suprayogi, Slamet
Media Komunikasi Geografi Vol 22, No 1 (2021)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/mkg.v22i1.32645

Terjadinya Abrasi dan Akresi di Muara Sungai Pemali Menandakan Pesisir Kabupaten Brebes sangat dinamis, Dimana penggunaan lahan menjadi sangat kompleks terkait dengan dinamika perubahan pesisir. Aktivitas di daratan dan lautan yang berlangsung dalam jangka waktu tertentu akan membentuk jenis pesisir yang berbeda-beda tergantung pada proses genetik dan material penyusunnya. Sehingga tiap tipologi pesisir akan memberikan ciri-ciri pada bentanglahan dan berbagai macam sumberdaya yang ada di wilayah pesisir tersebut. Bentuk pengelolaan dan pemanfaatannya pun akan berbeda disesuaikan dengan bentuk tipologi wilayah kepesisiran yang berkembang. Penelitian ini bertujuan untuk mengetahui tipologi wilayah pesisir, menganalisis potensi dan permasalahan hingga merumuskan alternatif pemecahan permasalahan di Muara Sungai Pemali Kabupaten Brebes. Metode yang digunakan dalam penelitian ini adalah metode analisis deskriptif, deskriptif-kuantitatif, deskriptif-komparatif dan metode analisis korelatif. Hasil penelitian menunjukkan bahwa secara keseluruhan tipologi fisik pesisir daerah penelitian merupakan area pesisir pengendapan laut dan pesisir pengendapan darat. Tipologi yang terbentuk memiliki potensi dan permasalahan sehingga dirumuskan alternatif pengelolaan berdasarkan permasalahan. Rumusan alternatif pengelolaannya antara lain melakukan rehabilitasi Mangrove, membangun struktur pelindung pantai, membuat peraturan daerah tentang sepadan pantai, melakukan inventarisasi kepemilikan lahan, penetapan kawasan lindung dan konservasi, serta melakukan pengelolaan lahan secara menyeluruh di wilayah pesisir pantai.

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