Hydrogeochemical Analysis to Identify Potential Groundwater Characteristics in the Jayapura Region

Felice Deglardini Wopari; Rusmawan Suwarman; Irwan Iskandar

doi:10.56099/ophi.v7i3.p112-122

Penulis

Felice Deglardini Wopari Universitas Cenderawasih, Indonesia
Rusmawan Suwarman Institut Teknologi Bandung, Indonesia
Irwan Iskandar Institut Teknologi Bandung, Indonesia https://orcid.org/0000-0002-4305-5453

DOI:

https://doi.org/10.56099/ophi.v7i3.p112-122

Kata Kunci:

good water, hydrogeochemistry, local meteoric water line, piper diagram, stable isotope δ18O and δ2H

Abstrak

Hidrogeokimia dan isotop stabil δ¹⁸O dan δ²H merupakan metode kimia yang digunakan untuk memahami proses kimiawi aliran air di dalam akuifer. Penelitian ini bertujuan untuk mengidentifikasi karakteristik air tanah dan air permukaan di wilayah Jayapura. Sampel air diambil dari 87 titik pengamatan yang tersebar di seluruh area penelitian. Hasil analisis hidrogeokimia terhadap ion-ion utama yang disajikan dalam diagram Piper menunjukkan bahwa tipe air yang dominan adalah Ca/Mg-HCO₃. Selain itu, ditemukan pula tipe-tipe air lainnya seperti Ca-HCO₃^-, Na- HCO₃^-, Mg-SO₄^2- , Ca-Cl, dan Na-Cl. Air hujan digunakan sebagai garis referensi dalam diagram, yang dikenal sebagai LMWL (local meteoric water line), dengan persamaan H = 7,019δ¹⁸O + 7,5162 dan koefisien determinasi sebesar 0,997. Analisis isotop stabil δ¹⁸O dan δ²H pada air tanah dan air permukaan menunjukkan bahwa sebagian besar sampel berada dalam kisaran garis referensi LMWL. Terdapat dua titik yang terletak di atas garis referensi LMWL dengan tipe air Ca-Cl. Temuan ini mengindikasikan bahwa karakteristik sumber daya air di wilayah Jayapura dipengaruhi oleh interaksi antara air dan proses pelapukan mineral di dekat permukaan. Interaksi tersebut berkontribusi terhadap potensi sumber daya air yang bersifat alami dan berkualitas di wilayah tersebut.

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