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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Majalah Geografi Indonesia Indonesian Journal of Forestry Research Journal of Degraded and Mining Lands Management GEA, Jurnal Pendidikan Geografi MAJALAH ILMIAH GLOBE Jurnal Geografi JURNAL PENDIDIKAN TAMBUSAI Geographica: Science and Education Journal Indonesian Journal of Forestry Research Wana Lstari
Margaretha Widyastuti
Department Of Environmental Geography, Faculty Of Geography, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Environmental Science Social Sciences Other

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Land use changes and their impact on groundwater vulnerability's spatio-temporal conditions Kintoro, Fachrurizal Sai; Adji, Tjahyo Nugroho; Widyastuti, Margaretha
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.6979

Abstract

Bantul Regency, located on Java Island, is one of the areas in Indonesia with abundant groundwater sources, thus experiencing rapid urban growth. The hazard of groundwater vulnerability in this area has increased due to urban expansion that coevals with changes in land use and human population growth. The objective of this study was to analyze how groundwater vulnerability has changed due to land use conditions and what impact those changes have had. Because of the various variables associated with urban growth, the sub-districts of Bantul and Bambanglipuro were explicitly chosen as research areas. This study compared groundwater vulnerability and land use between 2009 and 2021 in a spatiotemporal manner. The vulnerability determination method used is the Susceptibility Index (SI), which consists of the parameters depth of groundwater table, groundwater recharge, aquifer media, topography, and land use. Each parameter is processed into an index of groundwater vulnerability by scoring and weighting methods. Techniques for descriptive comparative analysis are employed to ascertain how changes in land use will affect the degree of groundwater vulnerability. The results of the land use classification show that the agroforestry area has decreased while the semi-urban area has increased in 2009 and 2021. The sub-district of Bambanglipuro underwent numerous changes. On the other hand, it is known that medium and high vulnerability levels dominate groundwater vulnerability. In this instance, it is concluded that variations in land use have impacted how groundwater vulnerability levels are distributed.
Modeling Seasonal Variations of Sediment Transport and Morphological Changes in Delta Ecosystem: A Case Study of the Wulan Delta, Indonesia Fadlillah, Lintang Nur; Widyastuti, Margaretha; Kim, Dong Hyeon; Marfai, Muh Aris
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 1 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.1.21-30

Abstract

The suspended sediment from the Serang River plays a crucial role in the development of the Wulan Delta. This study employs the open-source DELFT3D model to investigate seasonal hydrodynamics, sediment distribution, and morphodynamic changes in the delta. Sediment dynamics during both the rainy and dry seasons were analyzed using the DELFT3D-Flow model. Tidal data were sourced from TPXO 9v1 and field measurements, while bathymetric data from GEBCO were validated against in-situ observations. Model results indicate seasonal sediment concentration patterns, which were further validated against satellite imagery, demonstrating consistency between simulated and observed sediment distribution. Statistical analysis revealed an RMSE range of 0.001 to 0.061. The estimated sediment deposition rate is approximately 1.2 t·yr⁻¹, with a deposition rate of 2.74 t·m⁻²·yr⁻¹ at both river mouths. About 12% of the sediment accumulates near the river mouth, while the remainder is redistributed by currents influenced by the Java Sea's bed morphology. Erosion was primarily observed in the eastern part of the delta and at the OWR mouth, whereas the western delta exhibited significant deposition due to strong river currents and substantial sediment supply. This sediment distribution suggests potential delta expansion from the west to the north. Findings contribute to the understanding of sediment transport processes in deltas, with implications for mitigating coastal erosion, enhancing delta resilience, and preserving ecosystems in similar regions across northern Java.
Evaluation of River Water Pollution Level in Yogyakarta City Using CCME Method and Biodegradability Index Widyastuti, Margaretha; Aldina Noer Azizah; Adinda Aprilia Fajriani
JURNAL GEOGRAFI Vol. 17 No. 1 (2025): JURNAL GEOGRAFI
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jg.v17i1.64244

Abstract

River water quality in urban areas, particularly in Yogyakarta, has declined due to pollution from domestic, industrial, and agricultural activities. Communal wastewater treatment plants (CWWTPs) were established to address this issue; however, they have not been operating optimally, limiting their impact on improving water quality. Therefore, this study aims to 1) analyze the condition of water quality temporally and spatially in river sections in Yogyakarta City, 2) determine river water quality index temporally and spatially using Canadian Council of Ministers of the Environmental (CCME) method and Biodegradability Index (BI), 3) evaluate the level of water pollution between CCME method and BI, and 4) analyze water quality parameters influencing the pollution level. The study procedures were carried out using the institutional survey method, and data were obtained from temporal water quality monitoring by Yogyakarta City Environmental Service. Water quality assessment was based on standards according to Governor Regulation No. 20 of 2008. Evaluation of pollution levels was carried out using water quality index with CCME method and BI. The influence of dominant parameters was statistically tested using Principal Component Analysis (PCA). The results showed that water quality in Yogyakarta City based on CCME method and BI was dominated by the poor and non-biodegradable categories. Between 2020 and 2023, the CCME and BI index values of rivers showed an increasing trend, indicating a reduction in pollution. The primary factors affecting water quality include NO₂, TDS, temperature, DO, NO₃, and total phosphate, originating from domestic and agricultural activities. In contrast, Cu, Zn, and Cd are primarily sourced from industrial activities.
RAINFALL VARIABILITY IN GUNUNGSEWU KARST AREA, JAVA ISLAND, INDONESIA Cahyadi, Ahmad; Haryono, Eko; Nugroho Adji, Tjahyo; Widyastuti, Margaretha; Agus Riyanto, Indra; Taufiq Nur Muhammad, Dzakwan; Fattah Tastian, Naufal
Indonesian Journal of Forestry Research Vol. 8 No. 1 (2021): Indonesian Journal of Forestry Research
Publisher : Association of Indonesian Forestry and Environment Researchers and Technicians

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2021.8.1.23-35

Abstract

Karst area is highly susceptible to changes to climate parameters. One of the parameters is rainfall variability. In addition to shaping the condition of water resources, rainfall in the Gunung Sewu karst area determines the nature of crop and livestock of the agriculture sectors―the local population's main economic activities, warranting the significance of the rainfall variability studies. Rainfall variability in karst areas also affects disaster conditions such as drought and floods. However, due to insufficient meteorological data in quality and quantity, there has been no rainfall variability studies conducted in this locality. The research intended to analyze rainfall variability in the Gunung Sewu karst area in 1979‒2013 by utilizing rainfall predictions from satellite images that many scholars had tested in different locations and recognized as having good quality. In the analysis, mean monthly rainfall was calculated, and the trends of annual rainfall and average rainfall intensity, dry and rainy seasons, the number of rainy days, and the effect of ENSO (El Niño Southern Oscillation) on rainfall were analyzed. The research data were 35 years of daily rainfall records derived from the National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR). The analysis results showed that the mean rainfall, number of rainy days, and rainfall intensity had an increasing trend. Also, El Niño quantitatively influenced the rain in the Gunung Kidul karst area.
KAJIAN PENGARUH KONDISI DAERAH RESAPAN AIR PADA POLA PEMANFAATAN RUANG DI SUB DAS JLANTAH-WALIKUN PADA WILAYAH DAS BENGAWAN SOLO HULU Alfandhani, Rahardhiansyah Setyawan; Hizbaron, Dyah Rahmawati; Widyastuti, Margaretha
Wana Lestari Vol 3 No 2 (2021): Wana Lestari
Publisher : Program Studi Kehutanan, Fakultas Pertanian, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/wanalestari.v5i02.6224

Abstract

Jlantah-Walikun subwatershed has a very significant development activity infrastructure which certainly has influenced the condition water catchment area. This study was written to examine the effect of water catchment conditions on space utilization patterns. The method overlay used to review criteria water catchment area conditions based on the number of values each supporting variable, the influence water catchment conditions with space utilization patterns by doing with overlay processing results and compiling water catchment area directives. The results of water catchment condition research obtained at the Jlantah-Walikun subwatershed were dominated by good, natural normal, rather critical condition criteria, starting critically and critical area. The effect of catchment condition with the pattern of utilization of space there are three results: influential, very influential, and no effect and direction water catchment area there are three criteria, appropriate, quite appropriate and not appropriate.
Co-Authors Adinda Aprilia Fajriani Aditya Rizky Pratama Agus Riyanto, Indra Ahmad Cahyadi **) Aldina Noer Azizah Alfandhani, Rahardhiansyah Setyawan Andy Wibawa Nurrohman Aprilia Nur Widiyastuti Christanto, Nugroho Dzakwan Taufiq Nur Muhammad Eko Haryono Fadilah, Gita Oktaviani Fadlillah, Lintang Nur Fattah Tastian, Naufal Galih Dwi Jayanto Hafidz Bachtiar Hizbaron, Dyah Rahmawati Indra Agus Riyanto Indra Agus Riyanto Kim, Dong Hyeon Kintoro, Fachrurizal Sai Komang Anggayana M Pramono Hadi, M Pramono Muh Aris Marfai Muhammad Aris Marfa'i Muhammad Naufal, Muhammad Muhammad Ridho Irshabdillah Nanang Ahmad Fauzi Naufal Fattah Tastian Novita Rahmawati Nugroho Adji, Tjahyo Rahmawati, Laelina Ramadhan, Fajri Riyanto, Indra Agus Slamet Suprayogi Slamet Suprayogi Sudarto Notosiswoyo Taufiq Nur Muhammad, Dzakwan Tivianton, Tommy Andryan Tjahyo Nugroho Adji Tjahyo Nugroho Adji