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Journal : Teknika

KAJIAN EMPIRIS SUMUR RESAPAN PADA TANAH SILT Edi Susilo; Bambang Sudarmanto; Bambang Purnijanto
Teknika Vol 12, No 2 (2017): October
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1109.123 KB) | DOI: 10.26623/teknika.v12i2.641

Abstract

Abstraksi : Pertumbuhan penduduk sebagai pemicu perubahan tataguna lahan memberikan dampak langsung terhadap peningkatan aliran permukaan dan menurunnya peresapan air ke dalam tanah, yang berakibat  terjadinya banjir dan kekurangan air tanah. Sumur resapan salah satu alat untuk menambah peresapan air dan sekaligus menurunkan debit banjir. Pendekatan persamaan debit sumur resapan pada umumnya dilakukan secara matematis, sedangkan secara empiris masih sangat kurang.Tekstur tanah diinvestigasi dengan grain size dan hidrometer. Klasifikasi tanah dengan menggunakan segitiga tekstur tanah menurut USDA. Dengan menggunakan sumur dinding rapat diameter 50 cm, dan tinggi 90 cm dilakukan pengujian debit resapan sumur sebanyak 6 kali dengan periode waktu awal 0 jam (tes-1), 3 jam (tes-2), 18 jam (tes-3), 24 jam (tes-4), 42 jam (tes-5), dan 24 jam (tes-6) dengan terus menerus sumur resapan diisi air tanpa terputus. Pengukuran debit resapan dilakukan dari kedalaman 85 cm, setiap penurunan 5 cm sampai kedalaman 10 cm. Diterimanya sebuah persamaan regressi dengan melihat koefisien korelasi (R2)mendekati 1.Hasil penelitian debit sumur resapan dengan diameter 0,50 meter untuk tekstur tanah silt, mengikuti persamaan parabola Qs = 0,000001 . H 4,487. Nilai R2 untuk persamaan ini adalah 0,984. Debit resapan sumur resapan akan menurun semakin lama peresapan berlangsung. Tanah silt belum mencapai kondisi jenuh dalam waktu peresapan selama 24 jam. Diharapkan penelitian ini dapat bermanfaat dalam pengembangan ilmu pengetahuan khususnya bidang sumber daya air yang berhubungan dengan permasalahan debit resap sumur resapan. Penelitian ini masih sangat awal dalam menyimpulkan hubungan debit resapan dengan kedalaman air dan masih perlu dikembangkan dengan variasi jenis tanah, diameter dan jenis sumur resapan.  Abstract: Population growth as a driver of land-use change has a direct impact on rising surface flows and decreasing infiltration into the soil, resulting in flooding and water shortages. The absorption well is one of the tools to increase water infiltration and simultaneously decrease the flood discharge. The approach of the discharge well equation is generally done mathematically, while the empirical is still very less. The soil texture is investigated by grain size and hydrometer. Soil classification using a soil texture triangle according to USDA. Using well wall wells of diameter 50 cm, and height 90 cm, a well discharge well 6 times (0 test-1), 3 hours (test-2), 18 hours (test-3), 24 hours hour (4th test), 42 hours (test-5), and 24 hours (test-6) with continuous absorption wells filled with water without interruption. The measurement of absorption discharge is done from a depth of 85 cm, each decrease 5 cm to a depth of 10 cm. Acceptance of a regression equation by looking at the correlation coefficient (R2) approaches 1.The results of discharge well discharge research with diameter 0.50 meters for silt soil texture, following parabolic equation Qs = 0,000001. H 4,487. The value of R2 for this equation is 0.984. The absorption well discharge will decrease the longer the infiltration takes place. The silt soil has not reached saturation condition within 24 hours of impregnation. It is expected that this research can be useful in the development of science, especially the field of water resources related to the problems of absorption wells disposal. This research is still very early in concluding the relationship of absorption discharge with water depth and still need to be developed with variation of soil type, diameter and type of absorption well
KAJIAN KEBUTUHAN PERLINTASAN TIDAK SEBIDANG JALUR KERETA API DENGAN JALAN RAYA DI TITIK PERLINTASAN GANEFO KECAMATAN MRANGGEN Bambang Sudarmanto
Teknika Vol 13, No 2 (2018): Oktober
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (710.466 KB) | DOI: 10.26623/teknika.v13i2.1303

Abstract

The crossing railway line with the highway is quite a lot in several places in Indonesia, especially on the island of Java. This is a problem in itself because it considers this crossing to have a negative impact on users of land transportation. Moreover, the government does not yet have a policy relating to planning, regulation, supervision and supervision at a level crossing and is discussed with traffic accidents at the intersection of a basic plot to develop systems and procedures at level crossings.The crossing between the Semarang-Purwodadi highway and the Semarang-Surabaya / Solo railway line across the crossing lane on Ganefo still uses a level crossing. In the end, it caused a quite serious problem, namely severe congestion at the time of leaving and returning to work and even frequent traffic accidents. The existence of level crossings at this point is the focus of research by using proposals issued by the Ministry of Attention regarding railway crossings with highways can be made without a door, or can be in a plot with doors equipped, or can be made a plot, according to the research objectives. this is knowing the type of crossing that is right at the crossing of Ganefo. The results of the calculation of the Daily Average Daily Traffic of the Purwodadi-Semarang Directions traffic on the Ganefo pathway found numbers of 15928.2 pcu with the percentage of motorcycle transportation modes (motor cycle) amounting to 87.47%. Whereas the opposite direction, namely Semarang-Purwodadi, is 12784.8 pcu and the percentage of motorbikes is 78.85% of the total traffic volume. The direct observation of the train journey at the Ganefo crossing point shows the number of train trips that cross the Ganefo as many as 18 trains / day. The average length of the vehicle is at 191,429 meters during peak hours. Charting the criteria for selecting the crossing type of the Ministry of Transportation shows that the crossing point of Ganefo still depends on the position of the point where it is still permitted to use level crossings with safety doors. However, taking into account the increasing number of train trips and considerations of inconvenience and security of road users, this is at risk because depending on the position of the point required the type of crossing is not as large.