Hasnawir Hasnawir
Balai Penelitian Kehutanan Makassar Jalan Perintis Kemerdekaan Km. 16 Makassar (90243), Sulawesi Selatan Tel: 0411-554049, Fax:0411-554058

Published : 9 Documents
Articles

Found 9 Documents
Search

INTENSITAS CURAH HUJAN MEMICU TANAH LONGSOR DANGKAL DI SULAWESI SELATAN Hasnawir, Hasnawir
Jurnal Penelitian Kehutanan Wallacea Vol 1, No 1 (2012): Jurnal Penelitian Kehutanan Wallacea
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan Makassar

Show Abstract | Original Source | Check in Google Scholar | Full PDF (790.623 KB)

Abstract

The rainfall induced landslides including shallow landslides have resulted in substantial property damage as well as loss of human lives. In recent years, the South Sulawesi province has been affected by numerous shallow landslide phenomena caused by particularly intense rains. The main objective of this study was to analyze the shallow landslides caused by intense rain that took place between 3rd and 4th May 2011 in the province of South Sulawesi and to determine rainfall thresholds for shallow landslides warning. The findings showed that rainfall intensity over 50 mm/hr might cause shallow landslides that could cause damage to property including loss of human lives. The threshold, as defined by the lower boundary of the points representing shallow landslides-triggering rainfall events, is expressed as I=52D-0.79. The threshold rainfall for shallow landslides could be very important information to develop the warning system in the study area. 
EARLY WARNING OF RAINFALL-INDUCED LANDSLIDES AND DEBRIS FLOWS ON MT. BAWAKARAENG, SOUTH SULAWESI,INDONESIA Hasnawir, Hasnawir
Indonesian Journal of Forestry Research Vol 10, No 1 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1918.974 KB)

Abstract

Rainfall thresholds that form the basis of the landslide warning systems now exist for a few areas in Indonesia. Based on analysis of historical data, threshold performance varies according to precipitation characteristics,  and threshold  exceed corresponds  to a given probability  of  landslide occurrence. Early warnings of landslides and debris flows that include specific information about affected areas, probability of landslide and debris flow occurrence, and expected timing are technically feasible as illustrated by a case study made on Mt. Bawakaraeng, South Sulawesi, Indonesia. Records from 1997 to 2007 of rainfall data and history of landslides and debris flows were collected from the Ministry of Public Works of the government of Indonesia. The threshold, as defined by the lower boundary of the points representing landslides and debris-triggering rainfall events, is expressed by the equations I= 41.85D-0,85  before the large scale landslide on March 26, 2004 and I = 37.71D-0,90after the large scale landslide, where I is the rainfall intensity (mm/hr) and D is the duration of rainfall (hr). According to empirical threshold analysis, the regression curve can be considered as a reliable rainfall intensity- duration threshold for the study area, above which, landslide or debris flow event may occur.
Opini Masyarakat terhadap Fungsi Hutan di Hulu DAS Kelara Hasnawir, Hasnawir; Muin, Nurhaedah
Buletin Eboni Vol 9, No 1 (2012): Info Teknis Eboni
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan Makassar

Show Abstract | Original Source | Check in Google Scholar | Full PDF (302.644 KB)

Abstract

Pertambahan jumlah penduduk dunia yang sangat pesat terutama yang terjadi di negara-negara berkembang seperti Indonesia  membawa konsekuensi makin bertambahnya kebutuhan manusia yang harus dipenuhi. Kebutuhan sandang, pangan, dan perumahan (kayu) serta keanekaragaman fungsi hutan terus meningkat. Penelitian mengenai opini masyarakat tentang fungsi hutan dilaksanakan di hulu DAS Kelara Kabupaten Gowa Provinsi Sulawesi Selatan. Berdasarkan hasil wawancara yang dilakukan di Desa Paladingan, hulu DAS Kelara menunjukkan bahwa opini masyarakat terhadap harapan fungsi utama dari hutan adalah 40% responden menyatakan hutan diharapkan dapat berfungsi untuk pelindung tata air, sebanyak 32,5% responden menyatakan hutan diharapkan dapat berfungsi untuk mencegah bencana alam,  22,5% responden menyatakan hutan diharapkan berfungsi untuk produksi dan peningkatan kesejahteraan dan sebanyak 5,0%  responden menyatakan hutan diharapkan memiliki fungsi lainnya seperti sumber kayu bakar. Opini masyarakat yang ada di hulu DAS tentang harapan fungsi hutan kemungkinan berbeda dengan masyarakat yang ada di bagian tengah dan hilir DAS. Namun demikian harapan terhadapfungsi hutan bagi masyarakat di hulu DAS dapat dijadikan sebagai salah satu bahan pertimbangan dalam merumuskan suatu kebijakan pengelolaan hutan secara tepat di dalam suatu DAS.
Monitoring dan Evaluasi Sub Daerah Aliran Sungai Kawatuna di Sulawesi Tengah Hasnawir, Hasnawir; Setiawan, Heru; Isnan, Wahyudi
Buletin Eboni Vol 12, No 2 (2015): Info Teknis Eboni
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan Makassar

Show Abstract | Original Source | Check in Google Scholar | Full PDF (364.966 KB)

Abstract

Monitoring dan evaluasi terhadap daerah aliran sungai (DAS) merupakan paramater yang penting untuk menilai kinerja suatu DAS. Tulisan ini memuat informasi monitoring dan evaluasi DAS pada aspek lahan dan tata air di sub DAS Kawatuna, DAS Palu Provinsi Sulawesi Tengah. Sub DAS Kawatuna adalah salah satu sub DAS di wilayah iklim kering dengan curah hujan tahunan rata-rata 729 mm/tahun. Monitoring dan evaluasi DAS pada aspek lahan menunjukkan bahwa tutupan lahan berupa hutan sekunder, pemukiman, pertanian lahan kering dengan topografi lahan dari datar, berombak, bergelombang, berbukit sampai bergunung. Berdasarkan kondisi iklim dan karakteristik biofisik sub DAS Kawatuna, daerah ini sangat sesuai untuk pengembangan budidaya bawang merah. Tingkat kekritisan lahan di sub DAS Kawatuna banyak dijumpai pada lahan berombak dan berbukit. Tingkat erosi bervariasi dengan kategori ringan sekitar 57%, sedang sekitar 18%, berat sekitar 10% dan sangat berat sekitar 15%. Monitoring dan evaluasi pada aspek tata air sub DAS Kawatuna menunjukkan bahwa Koefisien Regim Sungai (KRS) adalah 4,54 - 16,50, Indeks Peggunaan Air (IPA) adalah 0,46 dan Koefisien Variansi (CV) adalah 0,08. Berdasarkan Peraturan Direktur Jenderal Rehabilitasi Lahan dan Perhutanan Sosial Nomor: P.04/V-Set/2009 sub DAS Kawatuna termasuk dalam kategori baik. Kualitas air Sungai Kawatuna sebagian tercemar dengan tingkat kekeruhan air yang cukup tinggi. Debit air harian rata-rata 2,86 m3/detik. Rendahnya curah hujan di sub DAS Kawatuna menyebabkan masalah ketersediaan air bersih dan kekeringan.
Kajian Daya Dukung Daerah Aliran Sungai (DAS) Mapili Provinsi Sulawesi Barat Isnan, Wahyudi; Hasnawir, Hasnawir
Buletin Eboni Vol 14, No 2 (2017): Info Teknis Eboni
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan Makassar

Show Abstract | Original Source | Check in Google Scholar | Full PDF (545.472 KB)

Abstract

Kompleksitas dan dinamika yang terjadi dalam suatu Daerah Aliran Sungai (DAS) semakin meningkat dan beragam. Kondisi ini terjadi akibat intervensi manusia ataupun proses alami yang mengakibatkan tekanan terhadap daya dukung DAS. Tulisan ini memuat kajian daya dukung DAS dengan suatu studi di DAS Mapili Provinsi Sulawesi Barat. Kajian daya dukung DAS Mapili berdasarkan Peraturan Menteri Kehutanan Republik Indonesia Nomor: P.60/Menhut-II/2014 tentang Kriteria Penetapan Klasifikasi Daerah Aliran Sungai. Berdasarkan kajian tersebut, DAS Mapili dikatagorikan sebagai DAS yang dipulihkan daya dukungnya dengan nilai 108,75. Kondisi ini mengidentifikasikan bahwa DAS Mapili memerlukan suatu peningkatan pengelolaan DAS yang lebih baik terutama pada penanganan tingkat lahan kritis, tingkat erosi, koefisien rejim aliran, koefisien aliran tahunan, dan indeks penggunaan air.
EARLY WARNING OF RAINFALL-INDUCED LANDSLIDES AND DEBRIS FLOWS ON MT. BAWAKARAENG, SOUTH SULAWESI,INDONESIA Hasnawir, Hasnawir
Indonesian Journal of Forestry Research Vol 10, No 1 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1918.974 KB)

Abstract

Rainfall thresholds that form the basis of the landslide warning systems now exist for a few areas in Indonesia. Based on analysis of historical data, threshold performance varies according to precipitation characteristics,  and threshold  exceed corresponds  to a given probability  of  landslide occurrence. Early warnings of landslides and debris flows that include specific information about affected areas, probability of landslide and debris flow occurrence, and expected timing are technically feasible as illustrated by a case study made on Mt. Bawakaraeng, South Sulawesi, Indonesia. Records from 1997 to 2007 of rainfall data and history of landslides and debris flows were collected from the Ministry of Public Works of the government of Indonesia. The threshold, as defined by the lower boundary of the points representing landslides and debris-triggering rainfall events, is expressed by the equations I= 41.85D-0,85  before the large scale landslide on March 26, 2004 and I = 37.71D-0,90after the large scale landslide, where I is the rainfall intensity (mm/hr) and D is the duration of rainfall (hr). According to empirical threshold analysis, the regression curve can be considered as a reliable rainfall intensity- duration threshold for the study area, above which, landslide or debris flow event may occur.
Analysis of Characteristics and Typology of Mapili Watershed West Sulawesi Province Isnan, Wahyudi; Hasnawir, Hasnawir
Jurnal Wasian Vol 5, No 1 (2018): Jurnal Wasian
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1069.707 KB)

Abstract

The multisectoral, multidisciplinary, multi-stakeholder and multidimensional watersheds problems are the consequences of multifunctional watersheds.  The complexity of these problems demanding a system and management approach that appropriate with the characteristics and typology of the watershed. This study aims to analyze the characteristics and typology of Mapili watershed West Sulawesi Province. This research was conducted using surveys, primary, and secondary data collection. Application of geographic information system (GIS) with overlay maps and scoring was used. The results showed that Mapili biogeophysical characterization includes meteorology, morphology, morphometry, hydrology, watershed capability and socioeconomic, cultural and institutional characterization will influence the system of Mapili watershed management. Mapili watershed can be classified into two typology watershed, namely: typology II, which has a low total population density (97 people/km2) with high rainfall (>2500 mm/yr); and typology IV, which has a high total population density (377 people/km2) with low rainfall (<1500 mm/yr). Both typologies have different characteristics of watershed problems. Typology II is generally located in the central area and upstream Mapili and Typology IV are located in the downstream areas of Mapili watershed.Keywords: Watershed characteristic, watershed typology, GIS, Mapili watershed
EARLY WARNING OF RAINFALL-INDUCED LANDSLIDES AND DEBRIS FLOWS ON MT. BAWAKARAENG, SOUTH SULAWESI,INDONESIA Hasnawir, Hasnawir
Indonesian Journal of Forestry Research Vol 10, No 1 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1918.974 KB)

Abstract

Rainfall thresholds that form the basis of the landslide warning systems now exist for a few areas in Indonesia. Based on analysis of historical data, threshold performance varies according to precipitation characteristics,  and threshold  exceed corresponds  to a given probability  of  landslide occurrence. Early warnings of landslides and debris flows that include specific information about affected areas, probability of landslide and debris flow occurrence, and expected timing are technically feasible as illustrated by a case study made on Mt. Bawakaraeng, South Sulawesi, Indonesia. Records from 1997 to 2007 of rainfall data and history of landslides and debris flows were collected from the Ministry of Public Works of the government of Indonesia. The threshold, as defined by the lower boundary of the points representing landslides and debris-triggering rainfall events, is expressed by the equations I= 41.85D-0,85  before the large scale landslide on March 26, 2004 and I = 37.71D-0,90after the large scale landslide, where I is the rainfall intensity (mm/hr) and D is the duration of rainfall (hr). According to empirical threshold analysis, the regression curve can be considered as a reliable rainfall intensity- duration threshold for the study area, above which, landslide or debris flow event may occur.
Analysis of biogeophysics characteristics and discharge of Lompo Riaja Atas river and Lompo Riaja Bawah river, Ralla sub watershed Arsyad, Usman; Putranto, Beta; Aeni, Nur; Isnan, Wahyudi; Hasnawir, Hasnawir
Jurnal Penelitian Kehutanan Wallacea Vol 8, No 1 (2019): Jurnal Penelitian Kehutanan Wallacea
Publisher : Environment and Forestry Research and Development Institute of Makassar

Show Abstract | Original Source | Check in Google Scholar | Full PDF (461.411 KB)

Abstract

The biogeophysical characteristics of watersheds have an important role as a determinant of the river discharge amount in the watershed. Various watershed problems such as flood and drought related to river discharge require data and information. The importance of this data and information will determine a better watershed management plan. The issue of flooding and drought are the important issues in Ralla sub watershed, Souht Sulawesi Province. This study aims to describe the biogeophysical characteristics and the discharge of Lompo Riaja Atas and Lompo Riaja Bawah Rivers in Ralla sub watershed, Lisu Watershed. This research was conducted in from November 2016 to August 2017. Primary data collection was done through river discharge and precipitation measurements during 34 days of observation. Secondary data obtained from government or related agencies such as geological data obtained from Geological map of the Ujung Pandang sheet 1982, the slope data from Aster DEM, land type from RePPProt 1987, land cover data from google earth image 2015. A quantitative descriptive method was used to analyze the data obtained. The results showed that the Lompo Riaja Atas and Lompo Riaja Bawah rivers have relatively similar discharge fluctuation, although they have a different amount of discharge. River discharge of both rivers is more influenced by rainfall compared to biogeophysical conditions such as geology, topography, soil type, watershed area, watershed shape, river length and order, gradient, flow pattern, flow density, and land cover.