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All Journal Indonesian Journal of Geography Bulletin of Scientific Contribution : Geology
Hadian, M Sapari Dwi
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

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A Preliminary Study of Paleoflood Deposits of the Lukulo, Kebumen Regency, Central Java, based on River Geomorphology Mareta, Nandian; Lubis, Rachmat F; Ansori, Chusni; Hadian, M Sapari Dwi; P Saputro, Sugeng; Farisan, Ardhan
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.75926

Abstract

Lukulo is a river that flows through pre-tertiary rocks to the recent. The long Lukulo fluvial processes which included erosion, transportation, and deposition were depicted in extensive alluvial deposits downstream of the river. This vast alluvial plain may be a deposit result of the Lukulo flood in the past. The paleo-flood study is a study of flood events in the past with the technique used, namely knowing slack water deposits (Steding & Baker, 1987). Delineation of slackwater deposits is necessary to determine the location of paleoflood deposition. Geomorphology of Lukulo watershed is needed as a preliminary study to determine the characteristics of the Lukulo watershed. Based on the analysis of the Lukulo watershed, DEM, with the systematic method of literature review, the result of this watershed geomorphology was obtained, namely; the morphology of the Lukulo watershed included an elongated oblong shape of the watershed, with an average Rc value of all three segments (upstream, middle, and downstream) of 0,52. The average drainage density (Dd) of river flows in the Lukulo watershed is 8,05 km/km2 (middle class). The Lukulo gradient upstream is 450, entering the middle is reduced to 300, and downstream the gradient is reduced to 100. The morphology and morphometry of the Lukulo watershed are interpreted to mean that Lukulo belongs to the medium-spanned watershed in terms of flood runoff and erosion. The lithology is a mixture of impermeable and permeable rocks. Delineation of diluvial and alluvial deposits is found in the upstream, middle, and downstream, of the Lukulo river. It depicts delineated paleoflood deposits in all segments of the river.
Identifikasi Awal Zona Resapan Berdasarkan Kondisi Geologi Dan Sifat Fisik Air Daerah Cipatat Dan Padalarang, Kabupaten Bandung Barat, Provinsi Jawa Barat Freitas, Cecilia Soares; Trisnadiansyah, Moch Ridfan; Mutaqin, Deden Zaenudin; Barkah, M Nursiyam; Hadian, M Sapari Dwi
Bulletin of Scientific Contribution Vol 18, No 3 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v18i3.29333

Abstract

Daerah resapan air merupakan daerah yang perlu dijaga keberadaannya. Kawasan pegunungan pada umumnya merupakan daerah tangkapan sekaligus daerah resapan air hujan yang sangat baik. Daerah dengan kapabilitas tangkapan air yang baik perlu dikonservasi atau dilakukan suatu pengaturan agar daerah tersebut tidak ditutup sebagai lahan pemukiman. Terkhusus pada daerah Cipatat dan Padalarang merupakan salah satu daerah yang termasuk kedalam cekungan air tanah Batujajar. Daerah ini di dominasi oleh endapan vulkanik muda berupa breksi fragmen supported, breksi matriks supported, lava andesit dan lapili tuf yang berasal dari produk gunung Tangkuban Perahu serta endapan vulkanik tua berupa lapili skoria. Sumber daya air berpotensi baik dengan media akuifer kombinasi rekahan dan pori. Identifikasi awal zona resapan daerah penelitian menggunakan analisa kondisi geologi, kemiringan lereng, fault fracture density (FFD) dan drainage density (Dd), parameter sifat fisik air berupa EC-TDS dan debit. Hasil penelitian menunjukkan bahwa daerah penelitian teridentifikasi zona resapan berada di bagian timur laut pada elevasi 750 mdpl – 901 mdpl dengan kemiringan lereng berkisar 35o - 55o dengan litologi penyusun berupa breksi matriks supported, lapili tuf dan lava andesit. Hubungan antara airtanah dengan air permukaan pada zona ini bersifat influent, debit sungai kecil dengan nilai 4,54 L/s yang bersumber dari sungai Cipada. Zona ini memiliki nilai densitas FFD dan Dd sedang yaitu 0,2-0,8 m/km2 dan0-0,6 km/km2 dengan sifat fisik airtanah pada mata air memiliki rentang TDS antara 42-99 mg/l dan EC 62-144 µS/cm, sumur memiliki rentang TDS 11- 76 mg/l dan EC 17 – 118 µS/cm.
Co-Authors Barkah, M Nursiyam Chusni Ansori Farisan, Ardhan Freitas, Cecilia Soares Lubis, Rachmat F Mutaqin, Deden Zaenudin Nandian Mareta, Nandian P Saputro, Sugeng Trisnadiansyah, Moch Ridfan