Variasi spasial temporal hidrogeokimia dan sifat aliran untuk karakterisasi sistem kaerst dinamis di sungai bawah tanah Bribin Kabupaten Gunung Kidul DIY
This research is conducted in karst area, which is particularly enclosed by Bribin Underground River Catchment, Gunungkidul Regency. The objectives of this study are: (1) to understand spatial and temporal variation of flow characteristic as well as Diffuse Flow Proportion (PAD) of Bribin River;...
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2010
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| Online Access: | https://repository.ugm.ac.id/91526/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=49413 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | This research is conducted in karst area, which is particularly enclosed by
Bribin Underground River Catchment, Gunungkidul Regency. The objectives of this
study are: (1) to understand spatial and temporal variation of flow characteristic as
well as Diffuse Flow Proportion (PAD) of Bribin River; (2) to assess
hydrogeochemistry and to recognize the relationship between hydrogeochemistry
and flow characteristics of Bribin River, and (3) to define water agressivity of Bribin
River with respect to carbonate mineral and to express the components of Karst
Dynamic System (KDS) one-year behavior.
To define flow characteristic and PAD, three water level data loggers are
installed within upper, lower and the leakage point along Bribin River continued by
discharge measurement with the purpose of attaining stage-discharge rating curve.
Afterwards, PAD is defined by conducting digital filtering baseflow separation
approach after calculation of diffuse, fissure, and conduit recession constant. Next,
to figure out hydrogeochemical condition, 120 sample of karst water are analyzed
including rain, underground-river, and drip water. After that, scatter plots between
hydrogeochemical parameters are conducted to achieve the correlation between
PAD and hydrogeochemistry as well as to figure out hydrogeochemical processes to
occur. Subsequently, Saturation Indices analysis with respect to calcite mineral and
KDS components correlation is carried out to define karst water agressivity and its
manners along flowpath of Bribin River.
The research’s result demonstrates that there is spatial and temporal
differentiation of flow characteristics along Bribin River attributable to the
comportment of karst aquifer toward discharging its diffuse, fissure, or conduit flow
components, which consequence to the dissimilarity of PAD distribution along
Bribin River. Accordingly, PAD characteristics result to dry season
hydrogeochemical condition of Bribin River. However, wet season
hydrogeochemical condition is more influenced by means of dilution by
precipitation process within flood events, which exaggerates CO2 content of water.
Generally, the upper-stream cave tend to more aggressive in dissolving limestone,
contrast to down-steam cave that be inclined to precipitate carbonate mineral as a
result of their differentiation of cavities configuration. In addition, down-stream
cave is characterized by open system cavities, subsequent to the CO2 discharge to
preserve dissolution process. |
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