Anomali Imbuhan Pada Segmen Zona Transfer Sistem Fluvial Cikapundung, Jawa Barat

Zamzam A. J. Tanuwijaya, Hendarmawan Hendarmawan, Adjat Sudrajat, W. Kuntjoro

Abstrak


     Terdapat indikasi adanya gejala kehilangan debit sungai yang bersifat alami (non-rekayasa) pada segmen zona transfer Cikapundung, yaitu pada jalur sungai antara daerah Maribaya dan Curug Dago. Karena segmen ini bersifat effluent (air tanah mengisi air sungai) maka gejala imbuhan yang terjadi pada segmen ini merupakan suatu anomali influent (air sungai mengisi air tanah). Bagian dasar sungai pada zona ini ditutupi oleh lapisan lava basal yang masif, sehingga proses imbuhan yang terjadi diduga melalui struktur rekahan batuan. Berdasarkan hasil pengujian statistik dapat disimpulkan bahwa pada zona transfer memang terjadi gejala anomali imbuhan, yaitu pada sub-segmen sungai yang bergradien rendah dan berdensitas kelurusan regional tinggi. Sub-segmen yang berdensitas kelurusan tinggi secara umum memiliki densitas rekahan batuan yang tinggi pula.

Kata kunci: zona transfer, imbuhan, effluent, influent

     There is an indication of a natural loss of discharge phenomenon within the zone transfer of Cikapundung which are located between Maribaya area and Curung Dago. Because this segment is effluent in nature, the symptom of recharge that happened in this segment is an anomaly. The river bed in this zone is covered by massive basalt layers. Therefore the recharge process that happened is through the fractured of basalt. The results of a statistical test conclude that in the transfer zone there is a recharge anomaly phenomenon which is in the sub-segment of the river which has both a low gradient and a high regional lineament density. In general, the sub-segment that is of a high lineament density also shows high fracture density.

Keywords: transfer zone, recharge, effluent, influent


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DOI: https://doi.org/10.24198/bsc.v14i3.10968

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