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All Journal Indonesian Journal of Forestry Research Jurnal Geografi Jurnal Penelitian Pengelolaan Daerah Aliran Sungai
Indra Agus Riyanto
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Environmental Science 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.
TRADISI DAN RELIGI SEBAGAI UPAYA KONSERVASI MATA AIR MASYARAKAT PERDESAAN: STUDI KASUS MASYARAKAT KECAMATAN GIRIMULYO, KABUPATEN KULON PROGO (Tradition and religion as means of the rural community in spring conservation: a case study of Girimulyo Distric, Kulon Progo Region) Sudarmadji Sudarmadji; Fajar Sugiarto; Ratna Destra Kurniasari; Indra Agus Riyanto; Ahmad Cahyadi; Sudrajat Sudrajat
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 1 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (850.909 KB) | DOI: 10.20886/jppdas.2017.1.1.27-34

Abstract

Tradition and religion interact closely to the rural community, which is shown in their culture. This concept was applied to spring conservation in the rural area. The objective of this research was to show the role of tradition and religion in the use of spring based conservation by rural community. This research used a case study method. Data were collected by field surveys and interviews. The respondents were chosen randomly because the characteristic of the community was homogenous. The results of this research showed that tradition and religion in form of cultural ritual called spring cleaning (nguras sumber) and “be grateful to God” (slametan) had been capable to keep the sustainability of water resources in the spring, both the quantities and qualities of water. Nguras Sumber and Slametan were directed by a traditional leader called “Juru Kunci” followed by the community. The water resources were used for domestic water consumption, tourism, agriculture, and livestock throughout the year, even excessive in the rainy season. Therefore, the culture of Nguras Sumber and Slametan could be maintained as a form of spring’s conservation.
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
Co-Authors Ahmad Cahyadi **) Dzakwan Taufiq Nur Muhammad Eko Haryono Fajar Sugiarto Fajri Ramadhan M Widyastuti Margaretha Widyastuti Muhammad Naufal Naufal Fattah Tastian Ratna Destra Kurniasari Romza Fauzan Agniy Sudarmadji Sudarmadji Sudrajat sudrajat Tjahyo Nugroho Adji