PENGARUH PERUBAHAN PENGGUNAAN LAHAN TERHADAP LIMPASAN PERMUKAAN DI DAS CODE, YOGYAKARTA
| Main Authors: | , KARTIKA, , Dr. Slamet Suprayogi, MS. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/123159/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=63270 |
Daftar Isi:
- This research examined influence of land use changes on surface runoff in code watershed at province of D.I. Yogyakarta. Precipitation that falls on the watershed into the ground and then the rain water that was not able to get into the soil and runoff to the river. Changes in land use can damage one watershed conditions that can disrupt the flow of water, such as infiltration, percolation, runoff, interception and evapotranspiration. The purpose of this research was to quantify the thickness and volume of runoff and determine the effect of land use change on runoff. The thickness of the surface runoff was measured using the Soil Conservation Service-Curve Number (SCS-CN). This method uses the parameters of land use, soil hydrologic conditions (HSG) and rainfall. Parameters of land use and HSG generated value curve number (CN). CN values that have been generated are then used to calculate the change in retention parameter (S). Rainfall and value S were measured to get the amount of runoff that occurs in the thickness of the watershed Code. The volume of runoff in the watershed Code obtained from the magnitude of runoff thick with basin area code. Value of the thickness and volume of runoff used and discussed are the value of the thickness and volume of rain that did not happen or did not happen 0 mm rain. When the rain did not fall considered runoff that occurred in the watershed Code also 0 (zero) or does not exist. Existing land use in the watershed was dominated by settlements and Code fields. Residential land use will harden the land thus when raining, the rain water can not penetrate and infiltrate into the soil. The greater of the CN will make the resulting runoff volume also greater. The research was conducted for 28 days from February 2011, 1st to 28th, to observe the magnitude of simulating daily runoff in the watershed Code. The magnitude of the thickness of runoff (Q) ranged from 0,10 to 13,74 mm and the runoff volume (V) in the watershed Code ranged from 0437,53 to 62.164,85 m3 in 2001. In 2011 the thickness of the surface runoff in the watershed Code ranged from 1.19 mm to 6.03 mm, while the amount of runoff volume ranged from 5.387,97 to 27.292,13 m3. Greatest runoff occurred on February 9, 2001 and February 3, 2011. Smallest runoff occurred on February 13. Variations in the value of the thickness and volume of runoff occurred due to differences in rainfall values, land use and soil hydrologic conditions.