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All Journal Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Jurnal Ilmu Lingkungan Journal of Tropical Soils JTSL (Jurnal Tanah dan Sumberdaya Lahan) Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Syntax Literate: Jurnal Ilmiah Indonesia Jurnal Penelitian Kelapa Sawit Syntax Idea Jurnal Tanah dan Iklim Jurnal Scientia Jurnal Penelitian Kehutanan Wallacea
Enni Dwi Wahjunie
Departemen Ilmu Tanah Dan Sumberdaya Lahan, Fakultas Pertanian, Institut Pertanian Bogor, Jl. Meranti Kampus IPB Dramaga, Bogor 16680
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Education Environmental Science Law, Crime, Criminology & Criminal Justice Mathematics Social Sciences Other

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ANALYSIS OF THROUGH FALL AS EFFECTIVE RAIN INFORMATION IN VEGETATED LANDS Enni Dwi Wahjunie; Wahyu Purwakusuma; Eko Taufik Wirawan; Sri Malahayati Yusuf; Yayat Hidayat
Jurnal Scientia Vol. 12 No. 03 (2023): Education, Sosial science and Planning technique, 2023 (June-August)
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58471/scientia.v12i03.1662

Abstract

Rainfall is the water main source on the world. Rainwater that can be used for life is water that reaches the soil surface (effective rain), and then be stored in the soil or as surface runoff that causes flooding. The total of rainwater that reaches the soil surface on vegetated lands is highly dependent on the total of interception (water retained and absorbed by vegetation to then evaporate to atmosphere). The remaining rainwater that is not retained by vegetation will flow through the stem (stem flow) and through fall from the plant canopy to the soil surface. The total of rain water intercepted depends on the nature of the rain and the vegetation. Therefore, this study wanted to examine the total of through fall related to the type of vegetation and the rain characteristics. The research was conducted at Dusun Besar, Kayong Utara Regency, West Kalimantan during the 2021 rainy season, on a slope transect from flat land to hills. The transect was divided into several slope classes, then on each slope class were observed of the vegetation type, rainfall, through fall, and intercept. Observations showed that the through fall in each land use was, teak on slope I (J;I) was 74.81%; Coconut on slope I (K;I) was 74.41%; Durian on slope II (D,II) was 50.64%; Durian on slope IV (D;IV) was 59.58% and forest on slope IV (H;IV) was 54.58%. The greater through fall is in line with the greater and more rain frequent, and the smaller of plant area canopy.
Prediksi Debit Puncak DAS Ciliwung Hulu sebagai Pengendali Jasa Lingkungan Hidrologi Enni Dwi Wahjunie; Yayat Hidayat; Kardina Yulia Dewanti; Wahyu Purwakusuma
Jurnal Ilmu Lingkungan Vol 21, No 4 (2023): October 2023
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.21.4.946-955

Abstract

ABSTRAKDebit puncak aliran sungai Ciliwung bagian hulu dalam periode ulang tertentu merupakan informasi yang sangat penting dalam perencanaan pengendalian banjir maupun pemanfaatan sumberdaya air. Debit puncak aliran sungai utama tersebut dipengaruhi oleh debit aliran sungai dari setiap subDAS yang masuk ke sungai utama. Namun, Stasiun Pengamat Arus Sungai (SPAS) sebagai  sarana pengukur debit tidak tersedia di setiap Sub DAS. Tujuan penelitian ini adalah mengkaji akurasi Model Rasional dalam memprediksi debit puncak dan melakukan pendugaan debit puncak pada tiap Sub DAS Ciliwung Hulu. Pendugaan debit puncak dilakukan dengan metode Rasional menggunakan distribusi peluang.  Hasil penelitian menunjukkan bahwa prediksi debit puncak menggunakan metode Rasional dengan periode ulang T1 hingga T10 tahun memiliki  akurasi yang baik dengan R2 = 0,98 dan Nash-Sutcliffe Efficiency (NSE) = 0,14 pada distribusi Gumbel, sementara pada distribusi Log Pearson tipe III dengan R2 = 0,99 dan NSE = 0,86. Dengan demikian, model Rational dengan distribusi Log Pearson tipe III lebih layak digunakan sebagai prediksi debit puncak pada periode ulang T1 hingga T10, T25, T50 dan T100 tahun. Selanjutnya model Rational dengan distribusi Log Pearson tipe III  dapat digunakan untuk memprediksi debit puncak aliran sungai di tiap sub DAS Ciliwung Hulu, yaitu Sub DAS Cibalok, Ciesek, Ciliwung Hulu, Cisarua, Ciseuseupan, Cisukabiru, dan Cisuren. Berdasarkan pendugaan dengan metode Rational, nilai debit puncak prediksi terendah pada periode ulang 1 tahun terjadi di Sub DAS Cibalok sebesar 8,67 m³/detik dan tertinggi di Sub DAS Ciliwung Hulu sebesar 42,16 m³/detik.   Data prediksi debit puncak dari tiap subDAS Ciliwung hulu ini dapat menjadi informasi yang sangat penting dalam pengendalian sumberdaya air di DAS Ciliwung Hulu.Kata kunci: Debit puncak, distribusi Gumbel, distribusi Log Pearson Tipe III, metode Rasional, periode ulangABSTRACTThe peak discharge of the Upstream Ciliwung in certain period is very important information in flood control planning and utilization of water resources. The peak discharge of the main river is influenced by the discharge of the river flow from each sub watershed that enters the main river. However, the Stream Flow Observer Station (SPAS) as a means of measuring discharge  in every sub-watershed is not available. The purpose of this study was to examine the accuracy of the Rational Model in predicting peak discharge in each of the Upper Ciliwung Sub-Watershed.  The Peak discharge estimation was carried out using the Rational method with a probability distribution.  The result showed that the prediction of peak discharge using the Rational method with a return period of T1 to T10 years had a good accuracy with R2 = 0,98 and Nash-Sutcliffe Efficiency (NSE) = 0,14 in the Gumbel distribution, while in the Log Pearson type III distribution with R2 = 0,99 and NSE = 0,86.  Thus, the Rational model with Log Pearson Type III distribution is more suitable to be used as a prediction of peak discharge in the return period T1 to T10, T25, T50, and T100 years.  Furthermore, the Rational model with the Log Pearson distribution Type III can be used to predict the peak discharge of the stream flow in each of the Upper Ciliwung  Sub-Watershed, namely the Cibalok, Ciesek, Ciliwung Hulu, Cisarua, Cisesuseupan, Cisukabiru, and Cisuren.  Based on the estimation using the Rational method, the lowest predicted peak discharge value in the 1-year return period occurs in the Cibalok Watershed at 8.67m3/second and the hihgest in the Ciliwung Hulu Watershed at 42.16 m3/second.  The predicted peak discharge data from each upstream Ciliwung sub-Watershed can be very important information  for  controlling water resources in the Upper Ciliwung Watershed.Keyword: Gumbel distribution, Log Pearson Type III distribution, Peak discharge, Rational method, return Period.
Peranan Soil Tilth Terhadap Produktivitas Bawang Merah Enni Dwi Wahjunie; Sri Malahayati Yusuf; Raissa Syahputri Hairani
Syntax Idea 3330-3340
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/syntax-idea.v6i7.4232

Abstract

Bawang merah merupakan salah satu komoditas pangan yang penting, sehingga lahan produksinya perlu dipertahankan. Apabila produktivitas lahannya menurun, sangat potensi beralih fungsi menjadi lahan penggunaan lain. Sentra produksi bawang merah terbesar di Indonesia berada di Kabupaten Brebes, yang dikembangkan di berbagai jenis tanah dengan karakter berbeda. Perbedaan jenis tanah tersebut telah menunjukkan perbedaan produksinya. Sebagai tanaman umbi, bawang merah memerlukan media tanam yang baik (soil tilth), antara lain konsistensi dan kemampuan mengembang mengkerut tanah. Oleh karena itu, penelitian ini ingin mengkaji peranan soil tilth dan kemampuan mengembang mengkerut tanah terhadap produktivitas bawang merah. Penelitian dilakukan melalui tahapan survei lokasi pengembangan bawang merah di Kabupaten Brebes, pengumpulkan data produksinya di berbagai jenis tanah sentra produksi, analisis sifat-sifat tanah terutama konsistensi dan COLE (coeficient of linier extensibility), dan analisis keterkaitan sifat tanah terhadap produksi bawang merah. Hasil penelitian menunjukkan bahwa budidaya bawang merah di Kabupaten Brebes berada di tanah Kambisol Eutrik, Gleisol Eutrik, dan Mediteran Haplik. Kambisol Eutrik memiliki produktivitas bawang merah tertinggi diikuti oleh Mediteran Haplik dan Gleisol Eutrik. Konsistensi dan nilai COLE tanah berbeda antar jenis tanah. Indeks plastisitas, jangka olah, dan nilai COLE dipengaruhi oleh kadar klei dan bahan organik tanah. Semakin tinggi kadar klei dan makin rendah kadar bahan organik, sifat olah tanah makin buruk dan produksi makin rendah.
Water Balance Prediction by Simulating Land Use Planning and Water Retention Infrastructure in Upper Cisadane Sub-Watershed, West Java, Indonesia Yayat Hidayat; Latief Mahir Rachman; Enni Dwi Wahjunie; Dwi Putro Tejo Baskoro; Wahyu Purwakusuma; Sri Malahayati Yusuf; Fulki Dwiyandi Araswati
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 14 No 2 (2024): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.14.2.415

Abstract

Currently, water resources management is still focused on on-site water resources infrastructure to achieve optimal water utilization, with almost never considered land management in which water resources are produced naturally. The research aim is to study the water balance in the Upper Cisadane Sub-Watershed, and to simulate a land use plan and development of water resource infrastructure to fulfill the need for water in the Upper Cisadane Sub-Watershed using the SWAT (Soil and Water Assessment Tool) model. Existing water availability was calculated using stream discharge data from River Flow Measurement Station Empang, whereas water demand has been analyzed for domestic, industries, agriculture, fisheries, and animal husbandry. Totally, water availability in the Upper Cisadane Sub-Watershed was ± 222.9 MCM (Million Cubic Meters) year-1, which was higher than the demand for water of as much as ± 209.8 MCM year-1 and resulted in a water surplus of ± 13.1 MCM year-1. However, water availability was not evenly distributed throughout the year, and there was always a water deficit in the dry season. To overcome drought during the dry season, five simulations of land use management and construction of water retention infrastructure were carried out using the SWAT model. The water deficit in the Upper Cisadane SubWatershed will be overcome by the consistent application of the spatial plan of West Java Province, reforestation of converted forest areas, applied agroforestry in agricultural land, and development of a reservoir with a storage capacity of 30 MCM.
Co-Authors Adhy Ardiyanto Aditia Sapto Utomo AH. Maftuh Hafidh Zuhdi Alfin Murtadho Andria Harfani Qalbi Atang Sutandi Baba Barus Boedi Tjahjono Dwi Putro Tejo Baskoro Eko Taufik Wirawan Elianah Fulki Dwiyandi Araswati Iin Ichwandi Kardina Yulia Dewanti Kukuh Murtilaksono Kukuh Murtilaksono Latief Mahir Rachman Latief Mahir Rachman Latief Mahir Rahman Mariana Lusia Resubun Nurmaranti Alim Nurul Rahmalia Purwakusuma, Wahyu Raissa Syahputri Hairani Rikky Mulyawan Siti Faizah Zauhairah Suria Darma Tarigan Yayat Hidayat Yusuf, Sri Malahayati Zaenal Mubarok