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All Journal Indonesian Journal of Geography Indonesian Journal of Forestry Research Jurnal Geografi Social, Humanities, and Educational Studies (SHEs): Conference Series
Tjahyo Nugroho Adji
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Environmental Science Languange, Linguistic, Communication & Media Social Sciences Other

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RAINFALL VARIABILITY IN GUNUNGSEWU KARST AREA, JAVA ISLAND, INDONESIA Ahmad Cahyadi; Eko Haryono; Tjahyo Nugroho Adji; Margaretha Widyastuti; Indra Agus Riyanto; Dzakwan Taufiq Nur Muhammad; Naufal Fattah Tastian
Indonesian Journal of Forestry Research Vol 8, No 1 (2021): Indonesian Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/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.
Application Of Water Table Fluctuation Method To Quantify Spatial Groundwater Recharge Witidn The Southern Slope Of Merapi Volcano, Indonesia Tjahyo Nugroho Adji
Indonesian Journal of Geography Vol 39, No 2 (2007): 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.2245

Abstract

The southern slope of Merapi Volcano plays a significant role to Yogyakarta Municipality groundwater resources. Groundwater recharge, herein meant as the effective precipitation that infiltrates into unsaturated zone andpercolates to water table after exceeds the soi/field capacity, is the main subject in this article. The objective of this research is to apply WTF method to spatially define the groundwater annual recharge. Four wells are selected to represent some geomorphologic units. Then, four A WLR installed to record the yearly shallow groundwater table fluctuation. In addition, WTF method requires groundwaterfluctuation and specific yield data. The rate of groundwater recharge in every well confirms the varying value. However, it seems that geomorphologic unit may be principally control to the time series variation of shallow groundwater jluctuationthat results in groundwater recharge characteristic. The volcanic slope unit (above 600 m as!) has the lowest water table fluctuation indicates the resistant comportment to the annual rainfall. Ihis unit is characterized by the relatively high magnitude of recharge of approximately 4270 mm/year.
ANALISIS KONEKTIVITAS DAN KARAKTERISTIK LORONG PADA SISTEM HIDROGEOLOGI MATAAIR BETON, KAWASAN KARST GUNUNGSEWU, KABUPATEN GUNUNGKIDUL DENGAN UJI PERUNUTAN Ahmad Cahyadi; Eko Haryono; Tjahyo Nugroho Adji; M Widyastuti; Muhammad Naufal; Fajri Ramadhan; Romza Fauzan Agniy; Indra Agus Riyanto
JURNAL GEOGRAFI Vol 12, No 2 (2020): JURNAL GEOGRAFI
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jg.v12i02.14474

Abstract

Pemahaman tentang sistem hidrogeologi dan wilayah tangkapan air dari sebuah mata air sangatlah penting. Hal ini untuk membantu pengelolaan yang menjaga kelestariannya. Mataair Beton merupakan salah satu mataair yang memiliki peranan yang sangat penting di wilayah Ponjong, Kabupaten Gunungkidul. Suplai air dari mataair ini digunakan untuk memenuhi kebutuhan air bersih, irigasi persawahan dan perikanan. Penelitian ini bertujuan untuk mengetahui konektivitas dan karakterisasi lorong di sistem hidrogeologi Mataair Beton. Metode yang digunakan adalah tracer test dengan menggunakan fluorescent dyes. Hasil analisis menunjukkan bahwa Ponor Seropan memiliki konektivitas dengan Mataair Beton, dan memiliki karakteristik lorong berupa single conduit. Perkembangan lorong yang lanjut menunjukkan bahwa sistem hidrogeologi di lokasi kajian sangat dipengaruhi oleh imbuhan airtanah dari sistem alogenik yang berhulu di wilayah non-karst dan memiliki kerentanan terhadap pencemaran airtanah yang tinggi.Kata Kunci: Karst, Sungai Alogenik, Kawasan Karst Gunung Sewu, Uji Perunutan, Mataair BetonAn understanding of the hydrogeological system and catchment area of spring is very important. This is to help manage that maintains its sustainability. Beton Resurgence is one of the springs that have a very important role in the Ponjong area, Gunungkidul Regency. Water supply from the spring is used to supply clean water, irrigated rice fields, and fisheries. This study aims to determine the connectivity and characterization of Passage in the Beton hydrogeological system. The method used is a tracer test using fluorescent dyes. The results of the analysis of breaktrough curve indicate that Seropan Sinking Stream has connectivity with Beton resurgence, and has passage characteristics in the form of a single conduit. The further development of the passage shows that the hydrogeological system is strongly influenced by groundwater recharge originating from an allogenic system that originates in non-karst areas and has a high groundwater vulnerability to pollution. Keywords: Karst, Allogenic River, Gunungsewu Karst Area, Tracer Test, Beton Resurgence
Why are Allogenic Watersheds not Protected (Again)? Ahmad Cahyadi; Eko Haryono; Tjahyo Nugroho Adji; M. Widyastuti
Social, Humanities, and Educational Studies (SHEs): Conference Series Vol 3, No 1 (2020): Social, Humanities, and Educational Studies (SHEs): Conference Series
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.113 KB) | DOI: 10.20961/shes.v3i1.45054

Abstract

Allogenic recharge generally contributes to the formation of the main underground river system in a karst area. However, allogenic recharge have a higher susceptibility to contamination than autogenic recharge. This is because recharge from allogenic rivers enters the underground river system without undergoing filtration by soil or rock cavities. This paper discusses changes to ministerial regulations related to karst management that have led to the exclusion of allogenic river areas from the management of allogenic rivers, examines the urgency of managing allogenic rivers, and recommends future management of karst areas from the perspective of water resources management. The change in the Minister of Energy and Mineral Resources (ESDM) regulation regarding karst management has led to a simplification of the scope related to the main tasks and functions of the Ministry of ESDM. This should be followed by making changes to regulations that are higher than the ministerial level regulations so that the management objectives stated in the previous regulation can be covered and there is holistic management of the karst area.
Co-Authors Ahmad Cahyadi **) Dzakwan Taufiq Nur Muhammad Eko Haryono Fajri Ramadhan Indra Agus Riyanto M Widyastuti M. Widyastuti Margaretha Widyastuti Muhammad Naufal Naufal Fattah Tastian Romza Fauzan Agniy