scholarly journals SPATIAL AND TEMPORAL VARIATION OF HIDROGEOCHEMISTRY AND KARST FLOW PROPERTIES TO CHARACTERIZE KARST DYNAMIC SYSTEM IN BRIBIN UNDERGROUND RIVER, GUNUNG KIDUL REGENCY, DIY PROVINCE

2017 ◽  
Author(s):  
Tjahyo Nugroho Adji
Keyword(s):  
Dynamic System ◽  
Temporal Variation ◽  
Flow Characteristic ◽  
Karst Aquifer ◽  
Flow Characteristics ◽  
Karst Area ◽  
Spatial And Temporal Variation ◽  
Karst Water ◽  
Carbonate Mineral ◽  
Underground River

This research is conducted in karst area, which is particularly enclosed by Bribin Underground River Catchment, Gunungkidul Regency. The objectives of thisstudy are: (1) to understand spatial and temporal variation of flow characteristic as well as Diffuse Flow Proportion (PAD) of Bribin River; (2) to assesshydrogeochemistry and to recognize the relationship between hydrogeochemistry and flow characteristics of Bribin River, and (3) to define water agressivity of BribinRiver 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 bydischarge measurement with the purpose of attaining stage-discharge rating curve. Afterwards, PAD is defined by conducting digital filtering baseflow separationapproach after calculation of diffuse, fissure, and conduit recession constant. Next, to figure out hydrogeochemical condition, 120 sample of karst water are analyzedincluding rain, underground-river, and drip water. After that, scatter plots between hydrogeochemical parameters are conducted to achieve the correlation betweenPAD 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 thecomportment of karst aquifer toward discharging its diffuse, fissure, or conduit flow components, which consequence to the dissimilarity of PAD distribution alongBribin 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.

scholarly journals Estimated rate of karst aquifer development by MRC analysis and flood hydrograph components at Guntur Springs, Gunungsewu Karst Area, Indonesia

2020 ◽  
Vol 200 ◽  
pp. 02007
Author(s):  
Muhammad Naufal ◽  
Tjahyo Nugroho Adji ◽  
Ahmad Cahyadi ◽  
Eko Haryono ◽  
Margaretha Widyastuti ◽  
...  
Keyword(s):  
Flow System ◽  
Karst Aquifer ◽  
Flow Characteristics ◽  
Karst Area ◽  
Primary Input ◽  
Stable Component ◽  
Recession Curves ◽  
Flood Hydrograph ◽  
Aquifer Characteristics ◽  
One Year

Understanding the stage of karst aquifer development (karstification) is of vital importance because this parameter can reflect the character of flow system release, from which relevant management patterns are derived. Master Recession Curve (MRC) construction is considered ideal for identifying at which stage karstification works because MRC relies on recession curves as its primary input. Recession curves are the most stable component of flow hydrographs in representing aquifer characteristics. The study focused on springs located in a karst hydrogeological subsystem, namely, Guntur Spring in the Panggang Hydrogeological Subsystem (Gunungsewu Karst Area). It was designed to determine (1) the flow characteristics and (2) the degree of karst aquifer development at Guntur Spring. It utilized a one-year flow hydrograph with a 30-minute logging interval as the main data. The flood hydrograph showed that a fissure system dominated the flow characteristics. Moreover, the MRC construction results indicated that the karstification level at Guntur Spring was 5.0, confirming the dominant fissure system and also signs of the recent development of conduit flows.

scholarly journals The Effectiveness of Wenner-Schlumberger and Dipole-dipole Array of 2D Geoelectrical Survey to Detect The Occurring of Groundwater in the Gunung Kidul Karst Aquifer System, Yogyakarta, Indonesia

2016 ◽  
Vol 1 (2) ◽  
pp. 71 ◽  
Author(s):  
Oktanius Richard Hermawan ◽  
Doni Prakasa Eka Putra
Keyword(s):  
Karst Aquifer ◽  
Groundwater Exploration ◽  
Karst Area ◽  
Karst Terrain ◽  
Aquifer System ◽  
Crystalline Limestone ◽  
Karst Aquifer System ◽  
Dipole Configuration ◽  
Underground River ◽  
Water Saturated

Until today, geoelectrical survey is the most effective method for groundwater exploration. 2D method or known as horizontal profiling is now the most appropriate method in the geoelectrical survey compare to vertical electrical sounding method. The 2D method of Wenner-Schlumberger and Dipole-dipole configuration proved to be very effective to locate conventional aquifer occurrence on volcanic terrain or sedimentary terrain. Karst aquifer system is an unconventional aquifer and acts very differ in contrast with the conventional sedimentary aquifer. Heterogeneity and discontinuity of limestones in karst terrain will reveal a wide variety of resistivities, hence it is difficult to interpret. This research has important objective to define the effectiveness of the Wenner-Schlumberger and Dipole-dipole configuration in the 2D geoelectrical survey to explore groundwater in the karst area. Field observation of geology and 2D geoelectrical survey were conducted in underground river of Kali Suci Area, Gunung Kidul. In Kali Suci where an endokarst cave was occured on the surface, line survey was placed in the top of the cave and across the geometry of the cave. Measured stratigraphy in the wall of the cave found four types of limestone which consist of packstone, wackestone, grainstone and crystalline limestone. The Wenner-Schlumberger and Dipole-dipole method can detect differentiation of limestone types and also the exposed underground river successfully. However, compared to Wenner-Schlumberger array, Dipole-dipole array reveals less vertical accuration.. Therefore, on this research, the best method to detect water saturated zone or gourndwater in the karst system is the Wenner-Schlumberger method.

scholarly journals DIFFUSE FLOW SEPARATION WITHIN KARST UNDERGROUND RIVER AT NGRENENG CAVE

2017 ◽  
Author(s):  
Tjahyo Nugroho Adji ◽  
Heru Hendrayana ◽  
Sudarmadji ◽  
Suratman Woro
Keyword(s):  
Water Level ◽  
Flow Separation ◽  
Karst Aquifer ◽  
Digital Filtering ◽  
Base Flow ◽  
Karst Area ◽  
Flood Events ◽  
Wet Season ◽  
Diffuse Flow ◽  
Underground River

Diffuse flow is a dependable flow to recharge karst underground river within the dry season. Thisresearch is conducted at Ngreneng Cave, which is famous as the leakage tributary of Bribin River, themost important underground river in Gunungsewu karst area, Central Java. The objective of this researchis to separate the karst flow components at Ngreneng Cave, in order to acknowledge the percentage ofdiffuse flow during the period of measurement. A water level data logger is installed during one yearperiod to understand the variation of water level within dry and wet season. Furthermore, to define StageDischarge Rating Curve, several discharge measurement is conducted within minimum, average andmaximum discharge condition. Afterwards, the diffuse flow separation from its total flow is conducted byusing automated base flow separation by digital filtering. The digital filtering values is acquired from theanalysis of recession constant value in the occurrence of flood events in a year observation and related tothe value of the base flow maximum indices (BFI) of karst aquifer. The result shows that during one yearobservation, Ngreneng Cave experiences 68 times of flooding, with digital filtering value of 0.992. Ingeneral, the monthly estimation of the diffuse flow percentage is very close to 80%, whereas it decreasesto 41-59% during flood events.

scholarly journals THE DISTRIBUTION OF FLOOD HYDROGRAPH RECESSION CONSTANT FOR CHARACTERIZATION OF KARST SPRING AND UNDERGROUND RIVER FLOW COMPONENTS RELEASING WITHIN GUNUNG SEWU KARST REGION

2017 ◽  
Author(s):  
Tjahyo Nugroho Adji ◽  
M Misqi
Keyword(s):  
River Flow ◽  
Karst Aquifer ◽  
Maximum Flow ◽  
Karst Area ◽  
Karst Region ◽  
Karst Spring ◽  
Flood Hydrograph ◽  
Flow Components ◽  
Underground River ◽  
Recession Constant

TThis research is carried out within two caves with underground river and one karst spring, which is locatedin Gunung Sewu karst area, Gunung Kidul. The objective of this research is to recognize some flood hydrograph properties of karst aquifer characterization in order to compare the comportment of aquifer to release its flow components between underground river and karst spring. Water level data loggers are installed within two caves and one karst spring represent upper, middle, and lower elevation of karst topography, which are Beton, Seropan, and Toto Cave, respectively. In addition, time series discharge measurement in correspond to minimum, average, and maximum flow events is conducted to formulate the Annual Stage Discharge Rating Curve. Thereby, the full year river hydrograph may be defined.Afterwards, by selecting several flood hydrograph events, the recession constant in each cave includingdiffuse flow (Kb), fissure flow (Ki), and conduit flow (Kc) recession constant, is then calculated andcompared in every location. The result shows that Beton Spring that represents the upper part of researcharea confirms the quickest respond towards rainfall events. Also, this point specifies the medium numberof diffuse recession constant (Kb=0.983), compared to Seropan (0.996), and Toto (0.937), means that theaquifer surrounding Toto Cave release its groundwater storage faster than Beton Spring and SeropanCave. On the contrary, Seropan Cave performs the highest value of diffuse recession constant (0.996) andthis situation is confirmed by its dry season discharge that still above 810 lt/second

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