Judul: Flood-Prone Area Analysis Using Scoring Method and HEC-RAS Model in the Lusi River Sub-Watershed, Grobogan Regency, Central Java
Abstrak: Pemodelan banjir dapat dilakukan dengan berbagai model, seperti model hidrologi, hidraulika, numerik, Sistem Informasi Geografis (SIG), dan statistik. Pemodelan dilakukan dalam memperoleh daerah rawan banjir yang diperlukan dalam upaya mitigasi dan adaptasi suatu wilayah. Pada penelitian ini bertujuan untuk mengevaluasi kehandalan metode skoring dan model HEC-RAS dalam memodelkan sebaran spasial daerah rawan banjir. Metode skoring merupakan bentuk pemodelan SIG yang memanfaatkan parameter-parameter penyebab banjir, seperti curah hujan, tutupan lahan, elevasi, kemiringan lahan, jenis tanah, serta kerapatan sungai dalam memodelkan daerah rawan banjir dalam cakupan yang luas. Model HEC-RAS merupakan pemodelan banjir yang memperhitungkan topografi, geometri sungai, data hidrologi, dan data debit untuk menghasilkan simulasi aliran banjir yang komprehensif. Pemodelan daerah rawan banjir pada ruas Sub-DAS Lusi menggunakan metode skoring memiliki hasil uji ommision error yang lebih baik dibandingkan model HEC-RAS. Uji akurasi yang dilakukan didapatkan bahwa metode skoring memiliki ommision error sebesar 4,47%, sedangkan model HEC-RAS sebesar 76,78%. Kedua pendekatan ini dapat digunakan secara bersama-sama untuk memperoleh pemahaman yang lebih komprehensif tentang kerawanan banjir suatu daerah., Flood modeling can be done with various models, such as hydrological, hydraulic, numerical, Geographic Information System (GIS), and statistical models. Modeling is conducted to obtain flood-prone areas that are necessary for mitigation and adaptation efforts in a region. This research aims to evaluate the reliability of the scoring method and HEC-RAS model in modeling the spatial distribution of flood-prone areas. The scoring method is a form of GIS modeling that utilizes flood-causing parameters, such as rainfall, land cover, elevation, slope, soil type, and river density, to model flood-prone areas on a large scale. The HEC-RAS model is a flood modeling approach that considers topography, river geometry, hydrological data, and discharge data to produce comprehensive flood flow simulations.Flood-prone area modeling in the Lusi Sub-Watershed segment using the scoring method showed better results in the omission error test compared to the HEC-RAS model. The accuracy test revealed that the scoring method had an omission error of 4,47%, while the HEC-RAS model had an omission error of 76,78%. Both approaches can be used together to obtain a more comprehensive understanding of flood vulnerability in a region.
Keyword: skoring, HEC-RAS, flood, model, and vulnerability

Judul: Flood Inundation Modelling Using HEC-RAS Model (Case Study: Semarang City, Central Java)
Abstrak: Kota Semarang merupakan salah satu wilayah yang sering terdampak oleh banjir baik banjir rob maupun banjir akibat luapan sungai. Faktor-faktor penyebab banjir seperti tata guna lahan, tingginya curah hujan, tingkat urbanisasi yang tinggi, dan kapasitas drainase yang kurang menyebabkan banjir sering terjadi. Penelitian ini bertujuan untuk menganalisis model genangan banjir di masa lampau menggunakan model HEC-RAS 2D dengan dilakukan validasi model menggunakan data Landsat 7 ETM+ dan data curah hujan CHIRPS. Hasil menunjukkan bahwa banjir di 3 (tiga) kejadian yaitu 23 Januari 2014, 16 Februari 2017, dan 30 April 2019 memiliki luasan yang berbeda-beda, yaitu 378,25 ha, 377,61 ha, dan 310,53 ha. Validasi banjir menggunakan citra satelit Landsat 7 ETM+ menggunakan nilai wetness index pada masing-masing kejadian secara berturut-turut adalah 81, 84, dan 82 persen sehingga banjir model dengan wetness index memiliki nilai validasi yang tinggi. Variasi nilai pada validasi banjir disebabkan oleh gangguan awan dan resolusi spasial dari data DEM Kota Semarang., Semarang City is one of the areas that were often affected by flooding, both tidal flooding and flooding due to river overflow. Factors cause flooding such as land use, high rainfall, high urbanisation rate, and lack of drainage capacity increase flooding to occur frequently. This research aims to analyse past flood inundation models using the HEC-RAS 2D model with model validation using Landsat 7 ETM+ data and CHIRPS rainfall data. The results show that floods in three events, namely 23 January 2014, 16 February 2017, and 30 April 2019 have different areas, namely 378.25 ha, 377.61 ha, and 310.53 ha. Flood validation using Landsat 7 ETM+ satellite imagery using the wetness index value on each event is 81, 84, and 82 per cent respectively so the flood model with wetness index has a high validation value. The variation of values in flood validation is caused by cloud disturbance and spatial resolution of DEM data of Semarang City.
Keyword: Flood, HEC-RAS 2D, Landsat 7 ETM+, Semarang City, Wetness Index

Judul: Kandungan Kolesterol dan Vitamin A Ayam Arab yang Diberi Jamu Ternak Melalui Air Minum
Abstrak: Egg as one source of protein needed by the body contains high amount of essential amino acids, however in reality there is a constraint factor in consuming the eggs which is the high level cholesterol in an egg. Nowadays the cholesterol content of eggs is feared by most of the public in relation to its effect. Excess cholesterol can cause health problems, but on the other hand the yolks contain vitamin A which is good for the body. This research was aimed to study the cholesterol and vitamin A content of Arab chicken egg yolks with addition of herbs through drinking water it is expected to reduce the cholesterol level and increase the amount of vitamin A in egg yolks. This experiment was conducted in poultry house in block C of Animal Science Faculty, Bogor Agricultural Institute, it lasted from June to August 2011. Chicken used in this study was 48 arab hens by age 19 weeks. Research procedures include the preparation of cages and equipment, maintenance and provisions of herbal medicine. The design used in this study was a completely randomized design (CRD). The content of cholesterol during 5 weeks of herbal medicine with level of 5 ml per head and 10 ml per head was 535.28 mg/100 g up to 563.51 mg/ 100 g. The addition of herbal medicine for 3 consecutive days (per week) are mixed in hens drinking. The level differences does not affect the content of cholesterol in egg yolk, but the existence of different herbal medicine addition level provides different amount of vitamin A. The content of vitamin A in egg yolks for a treatment P0 (without herbs) amounted to 596.787 μg/ 100 g, P1 (herbs 5 ml/head/day) : 700.034 μg/ 100 g and P2 (10 ml/head/day) : 800.962 μg/ 100 g.
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