Judul: Impact of Land Use Change on Discharge and Sedimentation of Keduang Subwatershed of Bengawan Solo Watershed
Abstrak: Pertumbuhan penduduk, ekonomi dan industri mengakibatkan terjadinya perubahan penggunaan lahan di Sub DAS Keduang, DAS Bengawan Solo. Perubahan penggunaan lahan diduga mengakibatkan perubahan debit dan sedimen di Sub DAS Keduang. Penelitian dilakukan untuk menganalisis dampak perubahan penggunaan lahan selama 10 tahun terhadap debit dan sedimen. Penelitian ini menggunakan perangkat lunak ArcGIS, ArcSWAT dan SWAT-CUP. Tahap pengolahan data dibagi menjadi tahap simulasi, kalibrasi dan validasi. Hasil kalibrasi dan validasi model memberikan hasil yang baik dan memuaskan. Penggunaan lahan pada periode 2012–2021 mengalami kenaikan luas pada hutan lahan kering sekunder, hutan tanaman, permukiman, tubuh air dan sawah. Penurunan luas terjadi pada pertanian lahan kering, semak belukar dan pertanian lahan kering + semak. Pendugaan debit dan sedimen pada penggunaan lahan tahun 2012 sebesar 11,533 m3/s dan 750.670,4 ton/tahun, sedangkan pada penggunaan lahan tahun 2021 sebesar 11,306 m3/s dan 430.202,9 ton/tahun. Perubahan penggunaan lahan 2012–2021 tidak berdampak nyata terhadap penurunan koefisien run-off dan debit, penurunannya sebesar 1%, namun berdampak nyata terhadap penurunan muatan sedimen (43%)., Population, economic and industrial growth have resulted in land use change in Keduang Sub Watershed, Bengawan Solo Watershed. Land use change is expected to cause changes in discharge and sediment in Keduang Sub Watershed. The research was conducted to analyze the impact of land use change for 10 years on discharge and sediment. This study used ArcGIS, ArcSWAT and SWAT-CUP software. The data processing stage is divided into simulation, calibration and validation stages. The results of model calibration and validation provide good and satisfactory results. Land use in the 2012–2021 period experienced an increase in area in secondary dryland forests, plantations, settlements, water bodies and rice fields. The decrease in area occurred in dry land agriculture, shrubs and dry land + shrubs. Estimates of discharge and sediment in 2012 land use were 11,533 m3/s and 750.670,4 tons/year, while in 2021 land use were 11,306 m3/s and 430.202,9 tons/year. Land use change in 2012-2021 did not have a significant impact on reducing run-off and discharge coefficients, a decrease of 1%, but had a significant impact on reducing sediment loads (43%).
Keyword: discharge, hydrology, land use, sedimentation, SWAT

Judul: Kajian respon hidrologi DAS keduang menggunakan model MWSWAT
Abstrak: The research was conducted in Keduang watershed (36.426,87 Ha) in Wonogiri district, Central Java Province. The purposes of this research were (1) to analyse hydrological characteristic and erosion of Keduang watershed, (2) to simulate land use scenario response on hydrological characteristic and erosion of Keduang watershed. MWSWAT model was applied to define Hydrologi Response Unit (HRU). Hidrologycal analysis was done with SCS Curve Number and erosion analysis used MUSLE method. This research simulated four land use scenarios consist of (1) existing land use of 2005, (2) increasing forest area based on Act of Forestry No.41/1999, (3) land use change based on spasial plan (RTRW) Wonogiri Regency, and 4) agrotechnology in dry land area. The model was calibrated by using daily flow discharge from January 1st to March 31st and November 1st to December 31st 2004 as well as January 1st to March 20th 2005. The model was calibrated by using monthly sediment discharge from January to December 2004 and January to March 2005.The calibrated MWSWAT model was statisfied by Nash Sutcliffe efficiency (NSE) e.i 0,56 (2004) and 0,45 (2005) for flow discharge, and 0,40 (2004) and 0,48 (2005) for sediment discharge respectly. Although the calibrated model had been statisfied, but the values were below 0,75. It was due to input parameters that calibrating model is less sensitive to obtain the output that highly corelated with data. Calibration process was done by adjusting few parameters that are alpha BF, GW Revap, RCHRG_DP, CHK2, CHN1, ESCO, CH-Cov, CH_EROD, LAT_SED, SPExp, SPCon and USLE_P. The simulation showed that river regim coefficient Keduang watershed is 467,9 (2004) and 58,30 (2005). The runoff coefficient was 0,35 (2004) and 0,30 (2005). The simulation based on four scenario had affected on overlandflow, interflow and base flow. The second scenario resulted lowest overlandflow of 711,14 mm, or decreased 7% from existing condition. The fourth scenario gave lowest sediment yield on 2004 and 2005. Erosion prediction by appliying sediment delivery ratio method showed that simulation on 2004 was 178.634,38 mm/ha/year or 0,04 mm/year, that is lower than observation (75.580.248,11 ton/ha/year or 17,98 mm/year). Tolerable soil loss in Keduang watershed was 1,34 mm/year, however soil erosion of Keduang watershed is higher than tolerable soil loss. Therefore, it needs mitigation to decrease soil erosion in Keduang watershed.
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Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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