Varhana, Annisa Ramadhani (2022) Analisis Nilai Koefisien Aliran Permukaan Metode Cook Berdasarkan Penggunaan Laha, Kemiringan Lereng, Laju Infiltrasi, dan Simpanan Air Permukaan Di Desa Tambakrejo, Kabupaten Gresik. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Nilai koefisien aliran memiliki peran sebagai indikator aliran permukaan. Faktor yang mempengaruhi nilai koefisien aliran permukaan adalah kemiringan lereng, penggunaan lahan, laju infiltrasi, dan simpanan air permukaan. Pada penelitian ini, data yang digunakan yaitu data Rupa Bumi Indonesia (RBI), data DEM SRTM, dan data citra Landsat 8. Data tersebut diolah menggunakan Sistem Informasi Geografis (SIG) menggunakan software ArcGis 10.3 (ArcMap) untuk memperoleh peta klasifikasi tutupan lahan. Untuk memperoleh klasifikasi penggunaan lahan digunakan metode Maximum Likelihood Classification (MLC) dimana pada metode ini tiap jenis kelas akan dilakukan training data. Dilakukan uji ayakan dan ditemukan bahwa tekstur tanah pada daerah penelitian yaitu tanah berpasir. Dilakukan uji infiltrometer dan dilakukan pengukuran menggunakan metode aktual dan Horton. Didapatkan nilai koefisien aliran metode aktual sebesar 14,7857 cm/jam (Titik 1) 11,2372 cm/jam (Titik 2) dan metode Horton sebesar 15,663 cm/jam (Titik 1) 13,2751 cm/jam (Titik 2). Menghitung nilai koefisien aliran permukaan berdasarkan indeks nilai koefisien aliran permukaan tiap satuan penggunaan lahan. Besar nilai koefisien aliran permukaan berbeda-beda berdasarkan kemiringan lereng, penggunaan lahan, laju infiltrasi, dan simpanan air permukaan. Semakin tinggi kerapatan vegetasi, maka kemampuan tanah dalam menyerap air juga semakin tinggi menyebabkan nilai koefisien aliran permukaan menurun. Intensitas curah hujan yang semakin tinggi menyebabkan nilai koefisien aliran permukaan semakin besar karena semakin banyak air hujan yang menjadi aliran permukaan. Dari proses tersebut dapat diketahui presentase air yang terlimpas sebesar 49%. Namun, ditemukan bahwa pada daerah penelitian seharusnya dominan tanah lempung menurut pengamatan geologi. Hal ini berbanding terbalik dengan hasil uji USCS, sehingga uji USCS kurang cocok karena beberapa faktor. Diharapkan dari analisis nilai koefisien aliran permukaan pada penelitian ini dapat digunakan untuk perencanaan sebuah embung sebagai cadangan air.
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The value of the flow coefficient has a role as an indicator of surface runoff. Factors that affect the coefficient of runoff are the slope, land use, infiltration rate, and surface water storage. In this study, the data used were Indonesian Rupa Bumi (RBI) data, DEM SRTM data, and Landsat 8 imagery data. The data were processed using a Geographic Information System (GIS) using ArcGIS 10.3 software (ArcMap) to obtain a land cover classification map. To obtain the land use classification method, the Maximum Likelihood Classification (MLC) method is used, where in this method each type of class will be carried out with training data. A sieve test was conducted and it was found that the soil texture in the study area was sandy soil. An infiltrometer test was performed and measurements were made using the actual and Horton methods. The actual method flow coefficient value is 14,7857 cm/hr (Titik 1) 11,2372 cm/hr (Titik 2) and Horton's method is 15,663 cm/hr (Titik 1) 13,2751 cm/hr (Titik 2). Calculating the runoff coefficient value based on the surface runoff coefficient value index for each land use unit. The value of the coefficient of runoff varies based on the slope, land use, infiltration rate, and surface water storage. The higher the vegetation density, the higher the ability of the soil to absorb water, causing the coefficient of runoff to decrease. The higher the intensity of rainfall causes the coefficient of surface runoff to be greater because more and more rainwater becomes surface runoff. From this process, it can be seen that the percentage of runoff water is 49%. However, it was found that in the study area, clay soil should be dominant according to geological observations. This is inversely proportional to the results of the USCS test, so the USCS test is not suitable due to several factors. It is hoped that the analysis of the coefficient of runoff in this study can be used for planning a reservoir as a water reserve.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSGf 621.367 8 Var a-1 |
| Uncontrolled Keywords: | Koefisien Aliran, Tutupan Lahan, Maximum Likelihood, Flow Coefficient, Cook’s Method, Infiltration Rate |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 18 Apr 2023 06:58 |
| Last Modified: | 18 Apr 2023 06:58 |
| URI: | http://repository.its.ac.id/id/eprint/97888 |
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