Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods
Sustainable groundwater management requires accurate identification of spring recharge zones, particularly in volcanic regions where water resources are critical. This study aimed to delineate the groundwater recharge zone of the Ababi Spring in Bali’s Karangasem Regency by integrating isotope hydro...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Polish Academy of Sciences
2025-03-01
|
| Series: | Journal of Water and Land Development |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/134330/2025-01-JWLD-18.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849338397765664768 |
|---|---|
| author | I Nengah Simpen I Wayan Redana Putu Doddy Heka Ardana |
| author_facet | I Nengah Simpen I Wayan Redana Putu Doddy Heka Ardana |
| author_sort | I Nengah Simpen |
| collection | DOAJ |
| description | Sustainable groundwater management requires accurate identification of spring recharge zones, particularly in volcanic regions where water resources are critical. This study aimed to delineate the groundwater recharge zone of the Ababi Spring in Bali’s Karangasem Regency by integrating isotope hydrological and geophysical techniques. Water samples were collected from five locations (211–978 m a.s.l.) and analysed for stable isotopes (δ2H or δD and δ18O). Vertical electrical sounding and audio magnetotelluric surveys were conducted to validate findings and map subsurface structures. The local meteoric water line was established (δ2H = 4.4912δ18O + 7.1419) and an isotope-elevation relationship was developed. The spring water exhibited depleted isotopic values (δ18O: −7.706‰, δ2H: −39.748‰) compared to local precipitation, indicating a higher-altitude source. The analysis identified the recharge zone at approximately 2,118 m a.s.l. Geophysical surveys revealed subsurface structures connecting the recharge area to the spring, with resistivity patterns indicating preferential flow paths going through fractured volcanic rocks. The effectiveness of this integrated approach was further validated through additional isotopic analysis of rainfall at 1,514 m a.s.l. This supported the established isotope-elevation relationship model (R2 = 0.6847). The study demonstrates the value of combining hydrochemical and geophysical methods for accurate recharge zone delineation in a volcanic terrain, particularly in regions with complex hydrogeological settings. These findings provide crucial information for implementing targeted conservation strategies and ensuring sustainable water resource management in the Karangasem region, while establishing a methodological framework applicable to similar volcanic environments. |
| format | Article |
| id | doaj-art-3a71a132d68c443280845fc8b0ea047c |
| institution | Kabale University |
| issn | 2083-4535 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Journal of Water and Land Development |
| spelling | doaj-art-3a71a132d68c443280845fc8b0ea047c2025-08-20T03:44:24ZengPolish Academy of SciencesJournal of Water and Land Development2083-45352025-03-01No 64163171https://doi.org/10.24425/jwld.2025.153529Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methodsI Nengah Simpen0https://orcid.org/0009-0009-0535-9083I Wayan Redana1https://orcid.org/0009-0006-9192-6002Putu Doddy Heka Ardana2https://orcid.org/0000-0003-1300-9728Udayana University, Faculty of Mathematics and Natural Sciences, Physics Study Program, Kampus Bukit Jimbaran, Denpasar, Bali, 80361, IndonesiaUdayana University, Postgraduate Faculty, Professional Engineer Education Study Program, Denpasar, Jl. Raya Kampus UNUD, Kampus Bukit Jimbaran, Jimbaran, Kuta Selantan, Kabupaten Badung, Bali 80361, IndonesiaNgurah Rai University, Faculty of Science and Technology, Civil Engineering Study Program, Jl. Kampus Ngurah Rai No. 30, Penatih, Kec. Denpasar Tim., Kota Denpasar, Bali 80238, IndonesiaSustainable groundwater management requires accurate identification of spring recharge zones, particularly in volcanic regions where water resources are critical. This study aimed to delineate the groundwater recharge zone of the Ababi Spring in Bali’s Karangasem Regency by integrating isotope hydrological and geophysical techniques. Water samples were collected from five locations (211–978 m a.s.l.) and analysed for stable isotopes (δ2H or δD and δ18O). Vertical electrical sounding and audio magnetotelluric surveys were conducted to validate findings and map subsurface structures. The local meteoric water line was established (δ2H = 4.4912δ18O + 7.1419) and an isotope-elevation relationship was developed. The spring water exhibited depleted isotopic values (δ18O: −7.706‰, δ2H: −39.748‰) compared to local precipitation, indicating a higher-altitude source. The analysis identified the recharge zone at approximately 2,118 m a.s.l. Geophysical surveys revealed subsurface structures connecting the recharge area to the spring, with resistivity patterns indicating preferential flow paths going through fractured volcanic rocks. The effectiveness of this integrated approach was further validated through additional isotopic analysis of rainfall at 1,514 m a.s.l. This supported the established isotope-elevation relationship model (R2 = 0.6847). The study demonstrates the value of combining hydrochemical and geophysical methods for accurate recharge zone delineation in a volcanic terrain, particularly in regions with complex hydrogeological settings. These findings provide crucial information for implementing targeted conservation strategies and ensuring sustainable water resource management in the Karangasem region, while establishing a methodological framework applicable to similar volcanic environments.https://journals.pan.pl/Content/134330/2025-01-JWLD-18.pdfaudio magnetotelluricgroundwater rechargeisotope hydrologyspring watervolcanic aquifer |
| spellingShingle | I Nengah Simpen I Wayan Redana Putu Doddy Heka Ardana Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods Journal of Water and Land Development audio magnetotelluric groundwater recharge isotope hydrology spring water volcanic aquifer |
| title | Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| title_full | Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| title_fullStr | Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| title_full_unstemmed | Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| title_short | Delineating Ababi Mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| title_sort | delineating ababi mountains spring recharge zones using combined isotope hydrology and geophysical methods |
| topic | audio magnetotelluric groundwater recharge isotope hydrology spring water volcanic aquifer |
| url | https://journals.pan.pl/Content/134330/2025-01-JWLD-18.pdf |
| work_keys_str_mv | AT inengahsimpen delineatingababimountainsspringrechargezonesusingcombinedisotopehydrologyandgeophysicalmethods AT iwayanredana delineatingababimountainsspringrechargezonesusingcombinedisotopehydrologyandgeophysicalmethods AT putudoddyhekaardana delineatingababimountainsspringrechargezonesusingcombinedisotopehydrologyandgeophysicalmethods |