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All Journal JURNAL GEOGRAFI Geografi dan Pengajarannya
Muhammad Asrori Indra Wardoyo
Universitas Negeri Yogyakarta
Education Physics Social Sciences

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SOME SOIL PROPERTIES OF THE GRABAG-PRINGSURAT PALEOCHANNEL (CENTRAL JAVA) INDICATING THE FATE OF PEDOGENESIS UNDER A SPECIFIC GEOMORPHOLOGICAL SITUATION Grace Helena Amaranthois Kapisan; Arif Ashari; Summayah Aimi Mohd Najib; Muhamad Ervin; Muhammad Asrori Indra Wardoyo; Bagas Syarifudin; Kamila Nur Fitriana; Raisya Arzety Olivia; Greace Nanda Putri Salma; Az-Zahra Arhdhana Reswari; Kinanthi Purbaning Yuangwidi; Bagus Tegar Sakti Prakosa
JURNAL GEOGRAFI Geografi dan Pengajarannya Vol 24 No 1 (2026): JURNAL GEOGRAFI Geografi dan Pengajarannya
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jggp.v24n1.p433-452

Abstract

Along with landform development, the soil on a landform also undergoes development characterized by various changes in physical and chemical characteristics. In this paper, we present the results of an investigating in to the physical and chemical characteristics of the soil in the paleochannel. The study was conducted in the Grabag-Pringsurat area where there are paleochannels with Pleistocene-aged materials. The study implemented the synthetic soil survey method. Nine paleochannels were selected as samples for observation. The data was then analyzed descriptively. There are two significant findings in this study. First, the physical properties of the soil are characterized by a dark color, fine-loamy texture, structural arrangement with strong aggregates, and strong consistency. In contrast, the chemical properties are characterized by acidic soil reactions. Second, soil properties are more developed in paleochannels filled with older materials. Overall, this study provides alternative information that reinforces the concept of soil development as an integral part of landform development. Keywords: Soil, Soil Properties, Soil-Geomorphology, Landform, Paleochannel
A GIS-BASED ASSESSMENT OF THE SURFACE RUN-OFF VULNERABILITY IN THE BORDER AREA OF ANCIENT VOLCANO IMOGIRI SUB-DISTRICT, YOGYAKARTA, INDONESIA Muhammad Asrori Indra Wardoyo; Nurul Khotimah
JURNAL GEOGRAFI Geografi dan Pengajarannya Vol 24 No 1 (2026): JURNAL GEOGRAFI Geografi dan Pengajarannya
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jggp.v24n1.p403-432

Abstract

The Imogiri region originated from an ancient volcano and has subsequently transformed into a Fluvio-Volcanic plain. As an ancient environment significantly affected by external variables of a humid tropical climate, possible hazards such as geomorphological risks and surface runoff areas must be acknowledged. This study seeks to assess the vulnerability of surface runoff by determining the surface runoff coefficient by the Cook Method utilizing Geographic Information Systems. The Cook technique categorizes watershed features into three components to determine the runoff coefficient: topography, soil type, and vegetation cover. Data analysis employs the Geographic Information System (GIS) utilizing ArcGIS 10.3 software. The analytical results indicate that a value of C = 0.592 was achieved in 2025. In Imogiri Sub-District, 59.2% of precipitation is classed as surface flow, indicating a high value. Understanding the hazards associated with surface run-off is crucial for the implementation of effective and sustainable disaster management strategies. Keywords: Surface Run-off, Cook Method, GIS
Co-Authors Arif Ashari Az-Zahra Arhdhana Reswari Bagas Syarifudin Bagus Tegar Sakti Prakosa Grace Helena Amaranthois Kapisan Greace Nanda Putri Salma Kamila Nur Fitriana Kinanthi Purbaning Yuangwidi Muhamad Ervin Nurul Khotimah Raisya Arzety Olivia Summayah Aimi Mohd Najib