scholarly journals IDENTIFIKASI POLA ALIRAN DI SEKITAR DAERAH GENANGAN BANJIR

2021 ◽  
Vol 3 (3) ◽  
pp. 220-226
Author(s):  
Indra Satria ◽  
Azmeri Azmeri ◽  
Yulia Hayati
Keyword(s):  
Rainfall Intensity ◽  
Flow Direction ◽  
Residential Area ◽  
Water Levels ◽  
Research Approach ◽  
Flood Inundation ◽  
Physical Damage ◽  
Drainage Flow ◽  
Quantitative And Qualitative Research ◽  
Inundation Area

Johan Pahlawan Sub-district especially Leuhan Village and Blang Beurandang Village is a residential area that was hit by a flood inundation. Rainfall intensity and flow pattern conditions cause inundation. Puddles result in physical damage to home components and cause a number of losses, with varying levels of inundation and water levels. This analysis study was conducted with the aim of identifying the condition of the pattern of drainage flow around the flood inundation area. The research approach is in the form of quantitative and qualitative research. Identification results obtained: The pattern of land flow and drainage in the form of flow direction is in accordance with the topographic conditions of the study area, with channel conditions such as shrubs, constriction and at certain points with conditions of low contoured areas so that inundation is prone to improvements such as maintenance activities and repair.

scholarly journals Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 896
Author(s):  
Thanh Thu Nguyen ◽  
Makoto Nakatsugawa ◽  
Tomohito J. Yamada ◽  
Tsuyoshi Hoshino
Keyword(s):  
River Basin ◽  
Extreme Rainfall ◽  
Flood Damage ◽  
Water Levels ◽  
Flood Inundation ◽  
Inundation Area ◽  
Inundation Depth ◽  
Study Results ◽  
Inundation Duration ◽  
Short Time

This study aims to evaluate the change in flood inundation in the Chitose River basin (CRB), a tributary of the Ishikari River, considering the extreme rainfall impacts and topographic vulnerability. The changing impacts were assessed using a large-ensemble rainfall dataset with a high resolution of 5 km (d4PDF) as input data for the rainfall–runoff–inundation (RRI) model. Additionally, the prediction of time differences between the peak discharge in the Chitose River and peak water levels at the confluence point intersecting the Ishikari River were improved compared to the previous study. Results indicate that due to climatic changes, extreme river floods are expected to increase by 21–24% in the Ishikari River basin (IRB), while flood inundation is expected to be severe and higher in the CRB, with increases of 24.5, 46.5, and 13.8% for the inundation area, inundation volume, and peak inundation depth, respectively. Flood inundation is likely to occur in the CRB downstream area with a frequency of 90–100%. Additionally, the inundation duration is expected to increase by 5–10 h here. Moreover, the short time difference (0–10 h) is predicted to increase significantly in the CRB. This study provides useful information for policymakers to mitigate flood damage in vulnerable areas.

scholarly journals STUDI PEMETAAN DAERAH GENANGAN BANJIR DAS SEI KAMBING DENGAN SISTEM INFORMASI GEOGRAFIS

Teras Jurnal ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 165
Author(s):  
Asril Zevri
Keyword(s):  
River Basin ◽  
Return Period ◽  
Daily Rainfall ◽  
Water Levels ◽  
Disaster Mitigation ◽  
Flood Inundation ◽  
The Public ◽  
Inundation Area ◽  
Flood Level ◽  
The Impact

<p><em>Sei Sikambing River Basin is one of the Sub Das of Deli River which has an important role in water requirement in Medan City. Rainfall with high intensity is supported by changes in land use causing floods which reach 0.6 m to 1 m from river banks. The purpose of this study was to map the Sei Kambing River basin flood inundation area as information to the public in disaster mitigation efforts. The scope of this research is to analyze the maximum daily rainfall with a return period of 2 to 100 years, analyze flood discharge with a return period of 2 to 100, analyze flood water levels with HECRAS software, and spatially map flood inundation areas with GIS. The results showed that the return flood rate of the Sikambing watershed with a 25-year return period of 211.94 m<sup>3</sup>/s caused the flood level of the Sikambing watershed to be between 1.7 m to 3.7 m. The Sikambing watershed flood inundation area reached an area of 1.19 Km<sup>2</sup> which resulted in the impact of flooding on 5 sub-districts in Medan, namely Medan Selayang District, Medan Sunggal, Medan Petisah, Medan Helvetia, and West Medan.</em><em></em></p>

Development of flood inundation area GIS database for Samsung-1 drainage sector, Seoul, Korea

2016 ◽  
Vol 49 (12) ◽  
pp. 981-993 ◽  
Author(s):  
Minkwan Oh ◽  
Dongryul Lee ◽  
Hyunhan Kwon ◽  
Dongkyun Kim
Keyword(s):  
Flood Inundation ◽  
Inundation Area ◽  
Gis Database

scholarly journals Impacts of Gender Differences on Women’s Participation in Community Work in Abbay Chomman Woreda, Ethiopia

2019 ◽  
Vol 13 ◽  
pp. 86-118
Author(s):  
RATA B KENEA
Keyword(s):  
Economic Empowerment ◽  
Research Approach ◽  
Community Work ◽  
Quantitative And Qualitative Research ◽  
Women's Participation ◽  
Participation Of Women ◽  
The Status ◽  
The Difference ◽  
The Town ◽  
Status Of Women

Though the participation of women in economic development and community work usually realized low as a whole due to various reasons, the contribution of gender in creating the difference in terms of their status even among the participatory women is untouched area. For instance, the research conducted by Atinafu Diga (2013) on assessment of economic empowerment of women the related studies entitled Assessment of economic empowerment of Women in Kolobo kebele, Abay chomman Woreda dealt with only inadequate economic empowerment problems and low participation of Women in educational leadership areas respectively as their overall findings. As a result, this study is undertaken to assess the status of women disparity to participate in community work in case of kolobo kebele, Ambo town, Oromia Regional State; Ethiopia.This study is descriptive in nature. For this particular study, both quantitative and qualitative research approach were employed. In doing this research paper, of the total population,79 samples were selected from the town selected using simple random and purposive sampling techniques. Here, 79 were responded for the 20 close-ended questions of the questionnaire and another 10 were responded for open-ended questions of the interview. To analyses the quantitative data, techniques such as tabulation, percentages, and numerical figures were employed to. On the other hand, Narration and comparative discussion were covered to analyse the qualitatively collected data.

scholarly journals Pemodelan Prediksi Banjir Kota Medan Dengan Menggunakan Sistem Informasi Geografis

2019 ◽  
Vol 8 (1) ◽  
pp. 19
Author(s):  
M S Roganda
Keyword(s):  
Rainfall Intensity ◽  
Flood Hazard ◽  
Middle Part ◽  
Flood Inundation ◽  
Flood Modeling ◽  
Analysis Technique ◽  
Study Techniques ◽  
The Impact ◽  
The City

This study aims to (1) Determine the results of inundation in Medan based on the scenario of rainfall intensity <60 mm / day and> 60 mm / day. (2) Determine the level of flood hazard based on flood inundation scenarios of rainfall intensity <60 mm / day and> 60 mm / day conducted in Medan City. (3) Determine the impact caused by the flooding based on interpretation techniques from the results of flood modeling conducted in Medan City. Data collection techniques used in this study are documentary study techniques. The data analysis technique was carried out with three stages, including (1) Determining the overflow results. (2) Determine the classification of flood hazard levels. (3) Identifying areas that affect flood hazard areas per district. The results in this study are (1) based on the scenario of rainfall intensity <60 mm / day, there is no inundation flooding, whereas based on the scenario of rainfall intensity> 60 mm / day shows several points of flood inundation especially in the northern part of Medan City. (2) flood hazard based on flood inundation scenario results in rainfall intensity <60 mm / day does not pose any danger at all whereas flood hazard based on flood inundation results rainfall intensity scenario> 60 mm / day shows that in the northern part there are two dominant classes namely class high and low, in the middle part of the city the dominant class terrain is medium and in the southern part of Medan City the dominance by medium and low classes. (3) Based on interpretation techniques carried out on the Flood Impact Map Based on Districts in Medan, it can be seen that several districts in Medan have several flood hazard classes such as low, medium, and high.Keywords: Medan City, Rain, Flood Modeling AbstrakPenelitian ini bertujuan untuk (1) Mengetahui hasil banjir genangan di Kota Medan berdasarkan skenario intensitas curah hujan < 60 mm/hari dan > 60 mm/hari. (2) Mengetahui tingkat bahaya banjir berdasarkan hasil banjir genangan skenario intensitas curah hujan < 60 mm/hari dan > 60 mm/hari yang dilakukan di Kota Medan. (3) Mengetahui dampak yang disebabkan banjir berdasarkan teknik interpretasi dari hasil pemodelan banjir yang dilakukan di Kota Medan. Teknik pengumpulan data yang digunakan dalam penelitian ini adalah teknik studi dokumenter. Teknik analisis data dilakukan dengan tiga tahapan diantaranya (1) Menentukan hasil luapan. (2) Menentukan klasifikasi tingkat bahaya banjir. (3) Mengidentifikasi wilayah-wilayah yang berdampak ke daerah bahaya banjir per kecamatan. Hasil dalam penelitian ini adalah (1) berdasarkan skenario intensitas curah hujan < 60 mm/hari tidak terjadi banjir genangan sedangkan berdasarkan skenario intensitas curah hujan > 60 mm/hari menunjukkan beberapa titik terjadi genangan banjir terutama di bagian utara Kota Medan. (2) bahaya banjir berdasarkan hasil banjir genangan skenario intensitas curah hujan < 60 mm/hari  tidak menimbulkan bahaya sama sekali sedangkan bahaya banjir berdasarkan hasil banjir genangan skenario intensitas curah hujan > 60 mm/hari  memperlihatkan  pada bagian utara ada dua kelas yang dominan yaitu kelas tinggi dan rendah, pada bagian tengah kota medan kelas yang dominan adalah sedang dan di bagian selatan Kota Medan dominasi oleh kelas sedang dan rendah. (3) Berdasarkan teknik interpretasi yang dilakukan pada Peta Dampak Banjir Berdasarkan Kecamatan Di Kota Medan terlihat bahwa beberapa kecamatan di Kota Medan memiliki beberapa kelas bahaya banjir seperti rendah, sedang dan tinggi.Kata Kunci : Kota Medan, Hujan, Pemodelan Banjir

Assimilation of inundation extent observations into a flood forecasting system:  a tempered particle filter for combatting degeneracy and sample impoverishment.

2021 ◽  
Author(s):  
Concetta Di Mauro ◽  
Renaud Hostache ◽  
Patrick Matgen ◽  
Peter Jan van Leeuwen ◽  
Nancy Nichols ◽  
...  
Keyword(s):  
Particle Filter ◽  
Main Idea ◽  
Water Levels ◽  
Smooth Transition ◽  
Observation Data ◽  
Flood Inundation ◽  
State Variables ◽  
Time Step ◽  
Radar Images ◽  
Forecasting System

&lt;p&gt;Data assimilation uses observation for updating model variables and improving model output accuracy. In this study, flood extent information derived from Earth Observation data (namely Synthetic Aperture Radar images) are assimilated into a loosely coupled flood inundation forecasting system via a Particle Filter (PF). A previous study based on a synthetic experiment has shown the validity and efficiency of a recently developed PF-based assimilation framework allowing to effectively integrate remote sensing-derived probabilistic flood inundation maps into a coupled hydrologic-hydraulic model. One of the main limitations of this recent framework based on sequential importance sampling is the sample degeneracy and impoverishment, as particles loose diversity and only few of them keep a substantial importance weight in the posterior distribution. In order to circumvent this limitation, a new methodology is adopted and evaluated: a tempered particle filter. The main idea is to update a set of state variables, namely through a smooth transition (iterative and adaptative process). To do so, the likelihood is factorized using small tempering factors. Each iteration includes subsequent resampling and mutation steps using a Monte Carlo Metropolis Hasting algorithm. The mutation step is required to regain diversity between the particles after the resampling. The new methodology is tested using synthetic twin experiments and the results are compared to the one obtained with the previous approach. The new proposed method enables to substantially improve the predictions of streamflow and water levels within the hydraulic domain at the assimilation time step. Moreover, the preliminary results show that these improvements are longer lasting. The proposed tempered particle filter also helps in keeping more diversity within the ensemble.&lt;/p&gt;

PREDICTING FLOOD INUNDATION AREA BY RAINFALL-RUNOFF-INUNDATION MODEL EMULATOR

2020 ◽  
Vol 76 (2) ◽  
pp. I_547-I_552
Author(s):  
Taisei SEKIMOTO ◽  
Satoshi WATANABE ◽  
Shunji KOTSUKI ◽  
Masafumi YAMADA ◽  
Shiori ABE ◽  
...  
Keyword(s):  
Flood Inundation ◽  
Rainfall Runoff ◽  
Inundation Area ◽  
Inundation Model

scholarly journals Basal Sliding and Conditions at the Glacier Bed as Revealed by Bore-hole Photography

1978 ◽  
Vol 20 (84) ◽  
pp. 469-508 ◽  
Author(s):  
H. F. Engelhardt ◽  
W. D. Harrison ◽  
Barclay Kamb
Keyword(s):  
Flow Direction ◽  
Water Pressure ◽  
Surface Flow ◽  
Water Levels ◽  
Surface Velocity ◽  
Internal Motions ◽  
Basal Sliding ◽  
Bed Roughness ◽  
Atmospheric Factors ◽  
Basal Shear

AbstractBore-hole photography demonstrates that the glacier bed was reached by cable-tool drilling in five bore holes in Blue Glacier, Washington. Basal sliding velocities measured by bore-hole photography, and confirmed by inclinometry, range from 0.3 to 3.0 cm/d and average 1.0 cm/d, much less than half the surface velocity of 15 cm/d. Sliding directions deviate up to 30° from the surface flow direction. Marked lateral and time variations in sliding velocity occur. The glacier bed consists of bedrock overlain by a ≈ 10 cm layer ofactive subsole drift, which intervenes between bedrock and ice sole and is actively involved in the sliding process. It forms a mechanically and visibly distinct layer, partially to completely ice-free, beneath the zone of debris-laden ice at the base of the glacier. Internal motions in the subsole drift include rolling of clasts caught between bedrock and moving ice. The largest sliding velocities occur in places where a basal gap, of width up to a few centimeters, intervenes between ice sole and subsole drift. The gap may result from ice—bed separation due to pressurization of the bed by bore-hole water. Water levels in bore holes reaching the bed drop to the bottom when good hydraulic connection is established with sub-glacial conduits; the water pressure in the conduits is essentially atmospheric. Factors responsible for the generally low sliding velocities are high bed roughness due to subsole drift, partial support of basal shear stress by rock friction, and minimal basal cavitation because of low water pressure in subglacial conduits. The observed basal conditions do not closely correspond to those assumed in existing theories of sliding.

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