Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Forum Geografi LIMNOTEK
M Widyastuti
Fakultas Geografi UGM
Earth & Planetary Sciences Engineering Environmental Science

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Spreading of Groundwater Contamined by Leached in the Surrounding Area of Piyungan Landfill Bantul District, Yogyakarta Province Sartohadi, J; Widyastuti, M; Lestari, I. Sri
Forum Geografi Vol 19, No 1 (2005): July 2005
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v19i1.4572

Abstract

The objectives of this research are: (1) to study the characteristics of aquifer, distribution and chemical types of groundwater in the research area; (2) to measure the consentration of major elements (HC03-, Cl-, S042-, Ca2+, Mg2+, Na+, K+) and minor elements (S2-, NH4+) as indicators of leached contamination in the groundwater; and (3) to establish the spreading of contamined groundwater by leached. The grid sampling method was applied in this research. The grid dimension is 1 cm x 1 cm measured in the 1:25000 scale of Indonesian Topographic Map. The groundwater samples were taken randomly within the grid. Not the whole study area covered by the map was grided but only the surrounding area of Piyungan Landfill and the area lower than Piyungan landfill were grided. The groundwater samples were taken during the rainy season because during the rainy season there were more leached produced from Piyungan Landfill. The groundwater samples were examined their physical and chemical qualities using the legal standard quality in Yogyakarta Province. Spatial analysis using maps and graphics were applied to examine the spreading of contimined groundwater by leached. The spreading of unconfined groundwater in the study area was not equal distributed but it seems to be controlled by the landforms. There were an increasing elements content of Cl-, Ca2+, Mg2+ and HCO3-, as well as dissolved oxygen, NO3- and S2- in the groundwater contamined by leached. The zonation of the spreading of groundwater contamined by leached was categorized into three class, i.e., central (location of landfill, well number 1 0), transisional (well number: 11, 12, 13, 15), and primary (well number: 8, 14, 16, 17, 25, 26) zones. The zonation of groundwater matched with the analysis of groundwater quality by the distance from the Piyungan Landfill.
Analisis Kondisi Hidrologi terhadap Perkembangan Wilayah Perkotaan Studi Kasus DAS Kali Belik Yogyakarta Suprayogi, Slamet; Fatchurohman, Hendy; Widyastuti, M
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 2 (2019): July
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i2.22364

Abstract

Perkembangan yang pesat di daerah Kota Yogyakarta memberikan berbagai konsekuensi dari sisi hidrologi. Perubahan lahan terbangun untuk memenuhi kebutuhan fasilitas fisik kota sangat cepat, seperti bangunan, jalan, dan tempat parkir. Kondisi ini akan merubah fungsi lahan sebagai satu kesatuan proses hidrologi, yakni lahan-lahan yang awalnya menyerap air  menjadi kedap air. Alih fungsi lahan yang diikuti oleh peningkatan aliran permukaan akan berpengaruh terhadap sumberdaya air baik dari segi kualitas maupun kuantitas. Hasil dari penelitian adalah terjadi perubahan penggunaan lahan di DAS Belik, yaitu berupa pengurangan lahan bervegetasi dan peningkatan lahan terbangun. Perubahan penggunaan lahan ini menyebabkan peningkatan koefisien aliran dan Curve Number (CN) di DAS Belik. Selain menyebabkan peningkatan koefisien aliran dan CN, peningkatan lahan terbagun juga menjadi sumber pencemar airtanah. Besarnya limbah domestik (detergen) dan sumber pencemar organik yang disebabkan konstruksi septictank yang terlalu dekat dengan sumur menyebabkan nilai phospat, nitrat, dan coliform jauh melebihi baku mutu air kelas 1. Kemudian arah aliran airtanah di DAS Belik bergerak dari hulu menuju ke arah hilir/selatan dengan potensi debit mencapai 104 liter/detik. Jika airtanah tercemar, maka konsentrasi pencemaran terbesar akan terjadi di bagian hilir DAS Belik.The consequence of rapid urbanization in the city of Yogyakarta lead to hydrological system change. Population and economic growth are the main reason for the increase in living place demand in the city of Yogyakarta. Landuse change is the impact of urban sprawl, which lead to the diminishing of groundwater resources and the increasing of overland flow. The extension of the built area that reaches the peri-urbans area and countryside will absolutely affect the quality and quantity of water resources.  The results show that landuse conversion occurred in several landuses in the sub-watershed of Belik. The main landuse change that detected from 2003-2012 is the diminishing of vegetated land and the increasing number of built area. Land conversion increased the run-off coefficient and Curve Number, that lead into the contamination of groundwater. The concentration of phosphate and coliform in almost all points exceeds the minimum standard of potable water. These results indicate that domestic wastewater and septic tank misconstructions play important role toward groundwater contamination. From the flownets construction, it shows that the groundwater flow from the northern part into southern part of  Belik sub-watershed with potential discharge up to 104 liter/second. There is also possibility for groundwater contamination to extent and reach the downstream area. the water resources.
Dampak Siklon Tropis Savannah Terhadap Karakteristik Hidrogeokimia Aliran pada Mata Air Guntur, Kawasan Karst Gunungsewu Ramadhan, Fajri; Riyanto, Indra Agus; Cahyadi, Ahmad; Naufal, Muhammad; Widyastuti, M; Adji, Tjahyo Nugroho
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 18, No 2 (2021): In progress [July 2021]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v18i2.30293

Abstract

Tropical Cyclones often occur in Indonesia and have disastrous impacts. Until now, no research has focused on time series data related to groundwater discharge and chemistry due to tropical cyclones. Therefore, this study aims to analyze and compare the characteristics of the hourly time series, both discharge and chemistry of the Guntur karst springs. Guntur Spring was affected by the tropical cyclone of Savannah on March 17, 2019. The method used in this study consisted of two parts, namely the analysis of the discharge and chemistry of Guntur Spring. Discharge analysis was performed by correlation test with rain intensity. Chemical analysis was carried out using the Minister of Health Regulation No. 90 of 2002 and expert standards. Other chemical analyzes were performed using a triangular piper, rectangular piper, and stiff diagram of the parameters Na+, K+, Ca2+, Mg2+, SO42-, Cl-, and HCO3-. The results of the relationship between discharge and rain intensity are directly proportional and increase significantly during a cyclone. The results of analysis of the Guntur Springs during Tropical Cyclone Savannah, all parameters are in accordance with the quality standard. In addition, there was a reduction in ion content due to the dilution process of Ca2+, Mg2+, Cl-, HCO3-., DHL, and pH ions compared to non-cyclone, Beton Resurgence, and Gremeng Resurgence ions. The chemical results when the cyclone is different compared to non-cyclone, Gremeng Resurgence and Beton Resurgence with a characteristic decrease in ionic content.
Assessment of Heavy Metals Using the Enrichment Factor and Geoaccumulation Index in Menjer Lake, a Tropical Volcanic Lake Fadlillah, Lintang; Widyastuti, M; Rachmawati, Alfina Ayu; Ulfa, Azura
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 30 No. 1 (2024)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2024.3880

Abstract

Lakes are recognized as vulnerable to pollution, including Menjer Lake, whose catchment area is dominated by agricultural lands and features floating net cages in the water body. The heightened contamination risk within the lake primarily stems from the accumulation of heavy metals, compounds known for their profound toxicity. The high-level concentration of heavy metal in sediment aligns with the level of water toxicity, underscoring the urgent need for thorough assessment and monitoring. The research focused on assessing heavy metal concentration and distribution through spatial analysis. Toxicity levels were evaluated using the enrichment factor (EF) and Geoaccumulation Index (Igeo). This study collected eight samples each during the rainy season of 2022 and 2023. The heavy metals were tested using an Atomic Absorption Spectrophotometer (AAS), including Pb, Cd, Cr, Fe, Al, and Cu. Comparatively, the mean concentration of heavy metals in 2023 was slightly higher for Fe and Al than in 2022. Moreover, Cd was not detected in either 2022 or 2023. The variety of land use and land cover has consequences on the spatial distribution of toxicity levels, showing an influential correlation between Al, Pb, and Fe metals with locations associated with cropland and floating net cages. Additionally, highly steep slopes significantly affected erosions that induced sediment from agricultural land use, further underscoring the multifaceted nature of environmental risk factors.
Co-Authors Ahmad Cahyadi **) Azura Ulfa, Azura Fadlillah, Lintang Fatchurohman, Hendy J Sartohadi Lestari, I. Sri Muhammad Naufal, Muhammad Rachmawati, Alfina Ayu Ramadhan, Fajri Riyanto, Indra Agus Slamet Suprayogi Tjahyo Nugroho Adji