Diffuse flow or slow-flow is the type of storage in karst aquifers that is the longest released during the recession period. For this reason, the length of time of release will affect the availability of reliable discharges in karst springs during the dry period. The higher the percentage of diffuse flow compared to the total discharge, the higher the discharge that can be relied upon to supply irrigation and domestic needs. This study is aimed to determine the spatial and temporal variations in diffuse flow percentages in the three largest springs on the north side of the Karangbolong karst (Kalisirah, Jumbleng, and Kalikarak springs). The primary data used is data from time-series water level recording with the HOBO U-30 logger, which then produces a discharge-hydrograph during the study period (November 2018-March 2020). Furthermore, baseflow separation is carried out automatically using the recursive digital filtering approach, where the BFImax value and recession constant are carried out manually by interpreting selected floods during the study period. The diffuse separation results show that, spatially, the monthly percentage of diffuse flow in the three springs is in the range of 80%, with the difference between the three springs not too large. The most volatile percentage was found in Kalisirah spring, with the smallest percentage (77.20%) occurring in November 2018 and the highest percentage in March 2020 (88.74%). Meanwhile, the percentage of diffuse flow experienced a drastic decrease in the incidence of flood peaks with varying ranges, namely at Kalisirah spring (9.06 - 31.16%); Jumbleng spring (14.30 - 60.73%); and Kalikarak spring (9.32 - 41.69%). As is the case with monthly percentages, the average percentage of diffuse flow during flood events in Kalisirah springs is the smallest (18.72%) when compared to Kalikarak springs (23.29%) and Jumbleng springs (43.34%). In short, the highest monthly diffuse flow fluctuations and the smallest percentage of diffuse flow during flood events indicate that aquifers that recharge Kalisirah springs have the most developed void sizes compared to the other two springs. Consequently, the spring with the lowest void development will have the most stable, reliable discharge for meeting both domestic and irrigation needs in this area. However, the differences between the three springs are not significant.
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23 November 2021
3RD INTERNATIONAL CONFERENCE ON EARTH SCIENCE, MINERAL, AND ENERGY
25 November 2020
Yogyakarta, Indonesia
Research Article|
November 23 2021
Diffuse flow separation in the three largest springs on the north side of the Karangbolong karst area, Central Java, Indonesia
Danang Riza Fauzi;
Danang Riza Fauzi
a)
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
a)Corresponding author: [email protected]
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Tjahyo Nugroho Adji;
Tjahyo Nugroho Adji
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Andy Setyawan;
Andy Setyawan
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Aulia Ika Rahmawati;
Aulia Ika Rahmawati
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Danung Shodikh Makhrizal;
Danung Shodikh Makhrizal
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Romza Fauzan Agniy;
Romza Fauzan Agniy
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Ahmad Cahyadi;
Ahmad Cahyadi
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Elisabeth Supi Astuti;
Elisabeth Supi Astuti
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Eko Haryono;
Eko Haryono
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Afid Nurkholis
Afid Nurkholis
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
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Danang Riza Fauzi
a)
Tjahyo Nugroho Adji
Andy Setyawan
Aulia Ika Rahmawati
Danung Shodikh Makhrizal
Romza Fauzan Agniy
Ahmad Cahyadi
Elisabeth Supi Astuti
Eko Haryono
Afid Nurkholis
Karst Research Group, Faculty of Geography, Universitas Gadjah Mada
, Yogyakarta, Indonesia
a)Corresponding author: [email protected]
AIP Conf. Proc. 2363, 040006 (2021)
Citation
Danang Riza Fauzi, Tjahyo Nugroho Adji, Andy Setyawan, Aulia Ika Rahmawati, Danung Shodikh Makhrizal, Romza Fauzan Agniy, Ahmad Cahyadi, Elisabeth Supi Astuti, Eko Haryono, Afid Nurkholis; Diffuse flow separation in the three largest springs on the north side of the Karangbolong karst area, Central Java, Indonesia. AIP Conf. Proc. 23 November 2021; 2363 (1): 040006. https://doi.org/10.1063/5.0061562
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