Judul: Kurva Lengkung Debit Aliran (Discharge Rating Curve) dan Karakteristik Debit Aliran Sungai Cidurian Kabupaten Serang, Provinsi Banten
Abstrak: River discharge is an important hydrological parameters that are used as information for planning and management of a watershed. The continuous data of the river discharge is urgently needed to support planning and watershed management programs. The continuous river discharge data is obtained by converting the river water level to river discharge using the discharge rating curve. The objectives of this research are to establish the discharge rating curve of Cidurian River and to evaluate discharge characteristics of Cidurian River in the year of 2008-2012. The discharge rating curve established a model of power is used. The discharge rating curve has been established then is used to analyze the characteristics of Cidurian River discharge. The regression equation of discharge rating curve that has been established from the results of measurements of river water level and discharge in 1998-2010 that is Q = 9.79h1,35, which resulted the coefficient of determination (R2 ) of 0.85 and RSME (Root Mean Square Error) value that is equal to 0.28. The effective water level when there is no flow is 0.1 m, the equation must be adjusted and becomes: Q = 9.79(h+0.1)1.35. Because the highest the river water level data is used that 2 m, so the discharge rating curve is only valid is used to estimating the discharge at maximum the water level 2 m. Pattern of flow rate fluctuation for the five years (2008-2012) is quite extreme, particularly in the year of 2010 due to La Nina. Nevertheless, the highest flow rate occured in 2012 which is amounted of 145.96 m3/sec, while the lowest flow occurred in 2011 in the amount of 0.37 m3/sec. The highest monthly average discharge occurred in February (28.78 m3/sec), while the lowest monthly average discharge occurs in July (10.95 m3/sec). The highest ratio of maximum and minimum annual discharge was in the year 2012 (293.48), while the lowest occurred in 2009 (107.63). Cidurian watershed conditions in 2008-2011 categorized as moderate, while it is categorized as poor in the year of 2012. Total volume of flow occurred in 2010 that reached to 996.73 mm with coefficient of runoff was 0.43. While the lowest total volume of flow occurred in 2011 (443.32 mm) with a coefficient of runoff was 0.25.
Keyword: watershed., river water levels, fluctuations, discharge rating curve, discharge

Judul: Kajian Kecepatan Aliran dan Sedimen Melayang Sungai Cidurian Kabupaten Serang Provinsi Banten
Abstrak: Kondisi sungai di Indonesia akhir ini sangat memprihatinkan, hal ini dapat dilihat dari peningkatan konsentrasi sedimen di sungai-sungai. Peningkatan konsentrasi sedimen diakibatkan tingginya tingkat erosi di wilayah daerah aliran sungai. Tingginya sedimentasi mengakibatkan pemanfaatan sungai-sungai di Indonesia tidak optimal. Penelitian ini bertujuan 1) Mengestimasi besarnya konsentrasi sedimen melayang dan debit sedimen melayang di bagian hilir Sungai Cidurian, 2) Mengkaji pola konsentrasi sedimen pada profil Sungai Cidurian, dan 3) Membandingkan kecepatan aliran hasil pengukuran lapang dan hasil perhitungan dari model persamaan Vanoni. Metode yang digunakan yaitu pengambilan sampel air di tiap kedalaman sungai. Pada penelitian ini diambil tiga profil sungai di bagian hilir Sungai Cidurian yaitu Tanara 1, Tanara 2, dan Tanara 3. Hasil perhitungan menunjukkan bahwa kecepatan aliran sungai bagian atas lebih tinggi dibandingkan dengan bagian bawah. Nilai kecepatan aliran sungai bagian atas di Tanara 1 sebesar 0.59 m/detik pada kedalaman rata-rata 0.6 m dan bagian bawahnya 0.14 m/detik pada kedalaman rata-rata 1.77 m, Tanara 2 bagian atas sebesar 0.55 m/detik pada kedalaman rata-rata 0.6 m dan bagian bawah 0.16 m/detik pada kedalaman rata-rata 1.8 m dan Tanara 3 bagian atas sebesar 0.43 m/detik pada kedalaman rata-rata 0.71 m dan bagian bawah sebesar 0.08 m/detik pada kedalaman rata-rata 2.13 m. Kecepatan aliran berdasarkan posisi menunjukkan tiap lokasi memiliki nilai yang bervariasi, sangat ditentukan oleh posisi dan /atau belokan sungainya. Tanara 1 memiliki nilai kecepatan aliran yang tertinggi pada posisi kiri, Tanara 2 dan Tanara 3 nilai tertingginya terdapat pada posisi tengah. Dalam batas-batas tertentu, persamaan Vanoni cukup berguna untuk pendugaan nilai kecepatan aliran. Kecepatan aliran digunakan untuk menghitung debit aliran sungai. Debit aliran Sungai Cidurian yang paling tinggi berada di Tanara 1 dan yang terendah berada pada Tanara 3. Konsentrasi sedimen pada Sungai Cidurian yang diperoleh dari pengambilan sampel memiliki nilai sebagai berikut, Tanara 1 sebesar 78,24 mg/l, Tanara 2 sebesar 72,86 mg/l, dan Tanara 3 sebesar 22,92 mg/l, dimana seluruh nilai kosentrasi tersebut termasuk dalam kategori baik. Nilai konsentrasi sedimen dipengaruhi oleh nilai kecepatan aliran, semakin tinggi nilai kecepatan aliran maka semakin tinggi nilai konsentrasi sedimen. Nilai debit sedimen dipengaruhi oleh nilai debit aliran, dimana semakin tinggi debit aliran maka debit sedimen akan tinggi pula.
Keyword: debit sedimen, debit sungai, kecepatan aliran, konsentrasi sedimen

Judul: Pemanfaatan Ekstrak Bunga Rosela (Hibiscus sabdariffa L) Kaya Antioksidan Dalam Pembuatan Mayonnaise Berbahan Dasar Minyak Kelapa, Minyak Sawit, dan Minyak Kedelai
Abstrak: The addition of Rosella flower extract and utilization various oli such as coconut, palm and soy were being involved in production of mayonnaise. Mayonnaise is a kind of ketchup which use canola or olive oil, egg, salt, and pepper and had been developed in France. The addition of Rosella extract (5%, 10% and 15%) base on amount of oil that used in production. Mayonnaise formulation are 75-78% oil, 6-9% egg yolk and flavors. Hedonic and hedonic quality sensory evaluations tested base on kind of oil. Base on evaluation the addition of Rosella extract statistically influenced color and thickness of coconut oil mayonnaise, color of palm oil mayonnaise, color and taste of soy oil. Fat analyze showed that there were statistically no difference between selected mayonnaise as well as protein and carbohydrate. Antioxidant activity and anthocyanine analyze showed that there were statistically difference between mayonnaise. Highest antioxidant activity and anthocyannin reached by palm oil mayonnaise with 15% Rosella extract.
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