The Effect of Allogenic Recharge on Multi-Temporal Water Quality Variations in the Pindul Cave Underground River, Gunungkidul

Abstract

The Pindul Cave Underground River is a source of water that is used for irrigation, fulfilling domestic needs, and also tourism. The source of water in the Pindul Cave Underground River comes from the surface river flow that enters the ponor (Allogenic Recharge) so that it affects the water quality in the Pindul Cave Underground River. The research was conducted with the aim of temporally analyzing the water quality in the Pindul Cave Underground River. River water samples were taken periodically for one year. Water quality was analyzed by comparing samples from laboratory and field tests with quality standards and hydrogeochemical analysis using triangle piper diagrams and rectangular piper diagrams. The results show that allogeneic affixes have an effect in the form of a relatively fast dilution process in the rainy season, thereby reducing the calcium value. This condition causes the water quality in the rainy season to be better than the dry season because the calcium level decreases and does not exceed the water quality standard. The results are corroborated by triangular and rectangular piper diagram analysis which shows that the water in the Pindul Cave Underground River is classified as calcium enrichment, unpolluted water.

Temporal Variation of Phosphate Contamination In Tropical Epikarst Springs, Gunungsewu Karst Area, Indonesia

“…Karst is a landscape with distinctive hydrological systems that play a vital role in clean water provision [1,2]. Another distinguishing feature is the dissolution process that creates conduits (a type of secondary porosity), even though water still oftentimes moves through intergranular pores via diffusion that are developing in soluble rocks [3,4]. Under these conditions, water falling on the ground moves down through subsurface fissures and channels and subsequently accumulates in karst aquifers or underground rivers [5].…”

Karakteristik Hidrogeokimia dan Kualitas Air pada Mata Air Karst Selonjono Karst Gunungsewu Daerah Istimewa Yogyakarta

“…Salah satu sistem hidrogeologi yang cukup jarang dilakukan kajian hidrogeokimia secara multitemporal adalah Sub Hidrogeologi Ponjong, terkhusus pada mataair yang tidak terpengaruh aliran sungai alogenik. Pada kajian sebelumnya telah dilakukan kajian hidrogeokimia multi-temporal pada mataair yang terpengaruh sistem alogenik misalnya oleh Cahyadi et al, (2020a;2020b;2021adan 2021b dan Tastian et al, (2022), selain itu juga dilakukan kajian hidrogeokimia pada sungai bawah tanah dan gua (Adji et al, 2017b). Kajian hidrogeokimia secara temporal musim penghujan dan kemarau juga cukup jarang dilakukan pada mataair yang tidak disuplai oleh sungai alogenik.…”