19 research outputs found
Correlation of BMKG with TRMM for daily and monthly rainfall series in Banten region
No full textDaily and monthly rainfall data series are necessary data for planning purposes in Civil Engineering and other fields. Incomplete rainfall data often occurs, so that rainfall data must be estimated based on rainfall data from several other nearby locations. The addition of rainfall data can lead to inaccurate planning. Rainfall data used for planning in the civil engineering sector is usually taken from the BMKG station. This data is taken from the rainfall station above the ground. Besides, that can also produce rainfall data from TRMM. Can take rainfall data from TRMM at all locations according to a coordinate of location. This rainfall data denotes an average rainfall taken from the satellite approximately 250 meters above the ground surface. An equation will be obtained by comparing the daily and monthly rainfall data from the two data sources. Based on TRMM rainfall, we can use the equation to estimate ground rainfall in a location. In this study, daily rainfall, monthly rainfall, the spectrum of daily and monthly rainfall data from BMKG are compared with rainfall and the spectrum of daily and monthly rainfall data from TRMM. The analysis results show that the monthly rainfall data from TRMM and BMKG correlate better than daily rainfall data
Design Planning of Small Dam Conservation at Deer Park University of Lampung
No full textIn the Faculty of Medicine, University of Lampung there is a pool with a small reservoir that can overflow during the rainy season, because it has not been able to accommodate the inflow water. The solution is planning a small dam to increase its function as water reservoir, flood control, and conservation.The methods are used to redesign this small dam conservation are hydrological analyses, small dam construction planning, analysis stability of planned constructions and estimating building construction cost. The result are storage capacity of small dam is 3627,9560 m3 from storage capacity before redesign is 3219,7176 m3, the flood debit of 0,8219 m3/s with cycle period 5 years, small dam planned height of 4,5 m,withabaseelevationat+103,5 thedamcrestelevation+106,61. Spillway which used is Open Ogee type and basin specific energy building Vlughter type. Stability small dam construction stated as safe with flood condition, normal condition and empty condition. Cost estimated of design planning of conservation small dam at Medicine Faculty University of Lampung is Rp3.265.660.000. (three billion two hundred sixty five million hundred sixty thousand Rupiah). Keyword : Small dam, Conservation, University of Lampun
Pengolahan Air Berkualitas Rendah Menjadi Air Domestik Non Konsumsi (Studi Kasus : Air Sungai Way Belau Kuripan - Bandar Lampung)
No full textAir merupakan sumber daya alam yang diperlukan untuk hajat hidup orang banyak, bahkan olehsemua makhluk hidup. Oleh karena itu, sumber daya air harus dilindungi agar tetap dapatdimanfaatkan dengan baik oleh manusia serta makhluk hidup yang lain. Tujuan penelitian iniantara lain: mengetahui karakteristik kualitas air sungai Way Belau Kuripan berdasarkanparameter yang diuji, merakit instalasi pengolahan air sungai berkualitas rendah menjadi airdomestik non konsumsi, menganalisis kinerja dan keefektivan dari instalasi pengolahan air sungaitersebut.Dalam penelitian uji perlakuan ini menggunakan dua dosis koagulan yang berbeda. Air sungai dariSungai Way Belau Kuripan Bandar Lampung dicampur dengan kedua dosis koagulan tersebut.Dalam pelaksanaannya terdapat tiga sampel, yaitu sampel awal sebelum perlakuan, sampel hasilperlakuan pertama, dan sampel perlakuan kedua. Ketiga sampel diuji di laboratorium UPTD BalaiLaboratorium Kesehatan Provinsi Lampung untuk mengetahui parameter COD, pH, TSS, AmoniaNitrogen, DO dan BOD. Pada model instalasi, air sungai yang telah dicampur dengan tawas, batukapur dan kaporit kemudian diaduk menggunakan mixer lalu sampel diendapkan selama 24 jamkemudian disaring dengan filter karbon aktif dan serat nilon.Hasil pengujian sampel hasil perlakuan model instalasi menunjukkan hasil yang baik, terutamapada parameter COD, TSS, Amonia Nitrogen, dan DO. Hasil pengujian sampel menunjukkankadar tawas efektif yaitu 0,50 gram/liter ditambah 0,1 gram/liter batu kapur dan 0,05 gram/literkaporit. Kadar tersebut dapat menurunkan kadar COD,pH, TSS, Amonia Nitrogen, dan BOD sertamenaikkan kadar DO masing-masing mencapai 64,59%, 23,09%, 53,29%, 51,95%, 66,79 dan543,94%. Hasil penelitian ini telah mampu merubah air sungai Way Belau Kuripan yangberkualitas rendah menjadi air yang berkualitas lebih baik
EVALUASI SISTEM DRAINASE KABUPATEN PRINGSEWU (Studi Kasus : Desa Wates Kecamatan Gadingrejo Kabupaten Pringsewu)
No full textABSTRAkSistem drainase didefinisikan sebagai serangkaian bangunan air yang berfungsi untuk mengurangi dan atau membuang kelebihan air dari suatu kawasan atau lahan. Penelitian ini dilakukan di jalan lintas barat desa wates kecamatan gadingrejo, pada pelaksanaannya dilakukan analisis hidrologi dan hidrolika. Analisis hidrologi menggunakan data curah hujan maksimum setelah itu dilakukan pengukuran dispersi melalui perhitungan parameter statistik. Dilanjutkan dengan pemilihan jenis distribusi untuk mendapatkan cara mengolah data pengukuran curah hujan rencana dan perhitungan intensitas hujan. Analissis hidrolika berupa debit drainase rencana, setelah itu di tentukan rencana dimensi yang sesuai.Hasil penelitian berdasarkan pengukuran dispersi diperoleh distribusi Log Pearson III dan diperoleh nilai curah hujan rencana untuk kala ulang 2 tahun sebesar 345,143 mm, dan untuk kala ulang 5 tahun sebesar 407,380 mm. Nilai debit hujan untuk kala ulang 2 tahun dengan metode rasional diperoleh nilai 2,815 m3/detik, dan kala ulang 5 tahun 3,322 m3/detik. Berdasarkan evaluasi pada kondisi eksisting pada segmen 1 sampai segmen 7 terdapat dimensi yang disarankan untuk dilakukan redesain yaitu pada segmen 3, dengan dimensi untuk kala ulang 2 tahun yaitu b = 1,50 m x h = 1,50 m, dan kala ulang 5 tahun dengan dimensi b = 1,80 m x h = 1,80 m sehingga saluran drainase mampu untuk menampung debit banjir.Kata kunci: analisis hidrologi, sistem drainase, distribusi Log Pearson III, debit rencana, dimensi saluran.ABSTRACTDrainage system is defined as a series of water structures that function to reduce and or remove excess water from an area or land. This research was conducted on the western causeway of Wates village, Gadingrejo sub-district. The hydrological and hydraulics analysis was performed. Hydrological analysis uses maximum rainfall data then the measurement of the dispersion is carried out through the calculation of statistical parameters. The stage was followed by selecting the type of distribution to get a way to process the planned rainfall measurement data and calculation of rain intensity. The hydraulic analysis in the form of planned drainage discharge, after which the appropriate dimensional plan is determined. The results of the study based on dispersion measurements obtained by Log Pearson III distribution and the value of the rainfall plan for the 2 year reiterative period was 354,143 mm, and for the 5 year reiterative period was 407,380 mm. The rain discharge value for the 2 year reiterative period using the rational method was 2,815 m3 / second, and the 5 year reiterative period was 3,322 m3 / second. According to the evaluation on the existing conditions in segment 1 to segment 7, there are dimensions that are suggested to be redesigned, namely in segment 3, with dimensions for a 2 year reiterative period, namely b = 1,50 m x h = 1,50 m, and a 5 year reiterative period with dimensions b = 1,80 m x h = 1,80 m so that the drainage channel is able to accommodate the flood discharge.Keywords: hydrolical analysis, drainage system, Pearson III log distribution, discharge, channel dimension
Prediksi Perubahan Garis Pantai Menggunakan Program GENESIS (Studi Kasus Pantai Kelapa Rapat)
No full textShoreline profile has a tendency to adjust the wave effect on the shoreline. Changes to the lineconsists of two kinds of erosion and sedimentation. Waves that can affect shorlines rise due to theinfluence of the wind, the wind blowing duration and distance without hurdles when the windblows (fetch). The waves were coming to cause the migration of sediment on the shoreline. Ifwaves erode sediment on the shoreline, shoreline will occur erosion and if the waves bring sedi-ment to the shoreline, on the shoreline sedimentation will occur. For example there is the KelapaRapat Beach (Pesawaran). On the beach, there is a highway a short distance away from theshoreline. Potential erosion will occur at the shoreline can cause breakdown of the resulting ero-sion of sediment on the shoreline. Due to the potential, then do research using GENESIS programto be able to estimate the extent of erosion potential disruption accessibility having an effect waycontained in about Kelapa Rapat Beach
Studi Pemodelan Curah hujan sintetik dari beberapa stasiun di wilayah Pringsewu
No full textThis research conducted to study the characteristics of daily rainfall and model making ofsynthetic daily rainfall in Pringsewu regency using periodic model, stochastic model and periodicstochastic models. This research conducted using daily rainfall data with length of 1984-2013from three rainfall stations, Pringsewu, Wonokriyo and Banyuwangi rainfall stations.These models performed by using 512 days annual data. Using rainfall frequency obtained andapplying the spectral method and the least squares method, it can be generated the daily rainfallperiodic models. Rainfall stochastic model assumed as the difference between rainfall data withperiodic rainfall models. Based on data from the series of stochastic, the component wascalculated using the approach of autoregressive models. Stochastic model was presented by usingthe autoregressive model of order three. Periodic stochastic model obtained by merging periodicmodel and stochastic model. Model validation and data obtained by calculating the correlationcoefficient. Based on the results of this research, it can be concluded that daily rainfall time seriescan be very significantly approximately recorded rainfall data. With the the average value ofcoefficient correlation of periodic model is 0.98019, coefficient correlation of stochastic model is0.99808, and coefficient correlation stochastic of periodic model is 0.99993keywords: daily rainfall, autoregresif models, stochastic component
Analisis Kapasitas Saluran Drainase Di Jl. Kartini Kecamatan Tanjung Karang Pusat Kota Bandar Lampung
No full textThe Bandar Lampung area which is quite routinely hit by floods is in Tanjung Karang Pusat District, the Jl. Wolter Monginsidi to Jl. Kartini. The reason is the high rainfall, as well as the curved road conditions and the performance of the drainage channel that is not optimal enough to accommodate the water discharge before carrying it to the Way Awi river which is on the road. The option that can be taken to reduce the risk of flooding is by evaluating the drainage channels on the road, taking into account the capacity of the drainage channels so that they are able to accommodate the flood discharge through them. The design discharge is calculated using hydrological analysis, rational methods, and based on maximum rainfall data for the last 10 years. For channel discharge capacity is calculated using hydraulics analysis and Manning's formula. The results of the analysis of the existing discharge capacity in most of the drainage channel segments are still able to accommodate the planned discharge with a 5-year return period of rain, so there is no need to increase the dimensions, except for segment 4, because the existing drainage capacity (Qs) is 0.700 m3/s smaller than design discharge (Qr) 1,238 m3/s. These conditions require the need to increase the dimensions of the drainage channel in order to accommodate the discharge through it. Key words : drainage, hydrological analysis, hydraulic analysis, flooding
Studi Air Tanah Berbasis Geographics Information System (GIS) di Kota Bandar Lampung
No full textPenelitian ini dilakukan untuk memberikan informasi dan gambaran umum kepada masyarakat tentang air tanah yang ada dengan cara menginventarisasi, mengeksploitasi, mengeksplorasi dan konservasi air tanah di Kota Bandar Lampung. Studi ini menggunakan program Geographic Information System (GIS) yang didukung dengan data sekunder berupa peta Bandar Lampung, data air tanah serta data curah hujan. Dalam penelitian ini dilakukan digitasi terhadap peta yang terdiri dari peta kondisi eksisting Bandar Lampung yang selanjutnya dioverlay dengan titik lokasi sumur bor menggunakan program GIS. Selain proses digitasi, dilakukan pula analisa neraca air tanah yakni antara tinggi air pengambilan sumur bor dengan tinggi hujan yang terinfiltrasi. Hasil dari penelitian didapatkan nilai keseimbangan air di tiap zona infiltrasi pada tahun 2006 yakni untuk zona infiltrasi <1.10-2 cm/detik selisihnya sebesar 7,909 m/tahun, zona infiltrasi antara 1.10-2 - 2.10-2 cm/detik selisih 7,896 m/tahun dan zona infiltrasi > 2.10-2 cm/detik 7,881 m/tahun. Jika diasumsikan setiap tahun mengalami peningkatan jumlah sumur sebesar 10% maka pada tahun 2016, untuk zona infiltrasi <1.10-2 cm/detik selisihnya sebesar 7,896 m/tahun, zona infiltrasi antara 1.10-2 - 2.10-2 cm/detik selisih 7,863 m/tahun dan zona infiltrasi >2.10-2 m/detik 7,823 m/tahun. Dari hasil analisa tersebut bisa disimpulkan pada tahun 2016 air tanah masih mencukupi untuk kebutuhan Kota Bandar Lampung, namun jika di lanjutkan sampai tahun 2079 kemungkinan akan mengalami krisis air tanah.Kata kunci : air tanah, neraca air, Geographics Information System (GIS
Analisis Data Curah Hujan yang Hilang dengan Menggunakan Metode Normal Ratio, Inversed Square Distance, Rata - Rata Aljabar dan Metode Modifikasi
No full textPenelitian ini dilakukan dengan tujuan untuk menghitung korelasi data curah hujan terukur dengan data curah hujan hasil perhitungan dengan masing-masing metode menggunakan lima stasiun.Dari hasil penilitian menggunakan metode Rata-Rata Aljabar, metode Normal Ratio, metode Inversed Square Distance dan metode Modifikasi dengan data hujan harian satu tahun, data hujan kumulatif bulanan, maupun data hujan rata-rata bulanan, dapat diambil kesimpulan semakin banyak jumlah stasiun maka semakin baik nilai korelasinya. Nilai korelasi dengan data hujan kumulatif bulanan sertadata hujan rata-rata bulanan menggunakan beberapa jumlah stasiun yang berbeda setiap masing - masing metode tidak ada perbedaan yang signifikan dengan nilai rata-rata korelasi persentase perbedaannya 0,049% sampai dengan 0,059%
Design Planning of Small Dam Conservation at Deer Park University of Lampung
No full textIn the Faculty of Medicine, University of Lampung there is a pool with a small reservoir that can overflow during the rainy season, because it has not been able to accommodate the inflow water. The solution is planning a small dam to increase its function as water reservoir, flood control, and conservation.The methods are used to redesign this small dam conservation are hydrological analyses, small dam construction planning, analysis stability of planned constructions and estimating building construction cost. The result are storage capacity of small dam is 3627,9560 m3 from storage capacity before redesign is 3219,7176 m3, the flood debit of 0,8219 m3/s with cycle period 5 years, small dam planned height of 4,5 m,withabaseelevationat+103,5 thedamcrestelevation+106,61. Spillway which used is Open Ogee type and basin specific energy building Vlughter type. Stability small dam construction stated as safe with flood condition, normal condition and empty condition. Cost estimated of design planning of conservation small dam at Medicine Faculty University of Lampung is Rp3.265.660.000. (three billion two hundred sixty five million hundred sixty thousand Rupiah)
