scholarly journals Simulasi genangan banjir menggunakan data ASTER DEM pada alur Sungai Cilemer

2017 ◽  
Vol 12 (1) ◽  
pp. 61-76
Author(s):  
Nuryanto Sasmito Slamet ◽  
Sarwono Sarwono
Keyword(s):  
Numerical Model ◽  
Digital Elevation Model ◽  
Return Period ◽  
Flood Control ◽  
Geographical Information ◽  
Inundation Area ◽  
Flood Discharge ◽  
Digital Elevation ◽  
Inundation Map ◽  
Elevation Model

The Cilemer River is a river which flowing to Lada Bay in west coast of Pandeglang District, Banten Province. The influence of the tide, the high flood discharges and settlements located at the flood plain has caused flooding every year. In order to understand flood overtopping mechanism and inundation map, numerical model simulation for flood and inundation area were conducted. The numerical model of the river were conducted using cross sectional of the river, result of these simulations were further integrated with Geographical Information System (GIS). The objective of this study is to obtain inundation map area. The input for GIS is a Digital Elevation Model which is obtain from Advanced Spaceborne Thermal Emission and Reflection Radiometer Digital Elevation Model (ASTER DEM). The simulation results shows the capacity of Cilemer River upstream is 210 m3/s while on the downstream segment was only 100 m3/s. Simulation shows with overtopping of the dike of 0,96 m generate 546 Ha of inundation area for 2 year return period of flood discharge. The overtopping of 1,1 m has generated 592 Ha of inundation area for 5 year return period of flood discharge. With overtopping of 1,26 m of 10 year return period flood discharge has caused 682 Ha inundation area, while 2,56 m overtopping has generated 912 Ha inundation area for 25 year return period of flood discharge. Effect of flood control structure on the outlet of bypass has generated 19 cm increase of water level.

Food Submergence Calculation and Analysis Using Digital Elevation Model and Geographical Information System

2014 ◽  
Vol 571-572 ◽  
pp. 792-795
Author(s):  
Xiao Qing Zhang ◽  
Kun Hua Wu
Keyword(s):  
Information System ◽  
Digital Elevation Model ◽  
Flood Control ◽  
Large Scale ◽  
Geographical Information ◽  
Economic Losses ◽  
Model Data ◽  
Digital Elevation ◽  
Elevation Model ◽  
Digital Elevation Model Data

Floods usually cause large-scale loss of human life and wide spread damage to properties. Determining flood zone is the core of flood damage assessment and flood control decision. The aim of this paper is to delineate the flood inundation area and estimate economic losses arising from flood using the digital elevation model data and geographic information system techniques. Flood extent estimation showed that digital elevation model data is very precious to model inundation, however, in order to be spatially explicit flood model, high resolution DEM is necessary. Finally, Analyses for the submergence area calculation accuracy.

scholarly journals A Method for Dynamical Sub-Watershed Delimitating by No-Fill Digital Elevation Model and Defined Precipitation: A Case Study of Wuhan, China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 486
Author(s):  
Hongping Zhang ◽  
Xinwen Cheng ◽  
Lei Jin ◽  
Dong Zhao ◽  
Tianjing Feng ◽  
...  
Keyword(s):  
Water Level ◽  
Digital Elevation Model ◽  
Flood Control ◽  
Return Periods ◽  
Wuhan City ◽  
Urban Flood ◽  
Digital Elevation ◽  
Elevation Model ◽  
Control Management

Watershed delimitation is very important in flood control management. The traditional sub-watersheds delimitated by a filling digital elevation model (DEM) may change the real sink area, such that it may not be the best choice in studies sensitive to sub-watershed storage. This paper proposes a dynamical watershed delimitation method using a no-fill DEM and precipitation. It considers a closed sink area containing cells that fully flow into a large special cell, which can flow out when its water level is “higher than outlet”. We took Wuhan City as a study area and defined the precipitation in return periods of 1, 5, 20, or 100 years to derive the sub-watersheds. It is found that, in the four delimitations, the ratio of isolated basic units which could not flow outside were 27%, 9%, 5%, and 1%, respectively, as the precipitation increased. The results show that the provided method satisfies the assumption that the sink area might overflow with increased precipitation. The sub-watershed delimitated by the proposed method has higher correlation with the distribution of waterlogging points than those delimitated according to the D8 algorithm. These findings indicate that the proposed method can derive reasonable sub-watershed delimitation and that it may be helpful in the practice of urban flood control management.

scholarly journals Genangan Banjir Pasang Pada Kawasan Pemukiman di Kecamatan Sayung, Kabupaten Demak – Provinsi Jawa Tengah

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Petrus Subardjo ◽  
Raden Ario
Keyword(s):  
Water Level ◽  
Digital Elevation Model ◽  
Model Verification ◽  
Sea Surface ◽  
Tidal Inundation ◽  
Central Java ◽  
Inundation Area ◽  
Digital Elevation ◽  
Elevation Model ◽  
The Impact

Wilayah pedesaan di Kecamatan Sayung, Kabupaten Demak merupakan daerah pemukiman yang sering terjadi banjir pasang. Banjir pasang yang menggenangi daerah tersebut karena ketinggian daratan sejajar dan atau lebih rendah dengan muka air laut. Hal ini diduga disebabkan karena terjadinya pasang surut tinggi tertinggi atau HHWL (High Highest Water Level) di wilayah tersebut, sehingga diperlukan suatu tindakan untuk menanggulangi maupun mengurangi dampak yang ditimbukan oleh hal tersebut. Tujuan penelitian ini adalah untuk mengetahui kenaikan pasang surut tinggi tertinggi dari setiap tahunnya dari data nilai HHWL tertinggi setiap bulannya dalam satu tahun. Pengolahan data menggunakan metode admiralty dari tahun 2004-2013 dan tipe pasang surut di Kecamatan Sayung, Kabupaten Demak, serta pemetaan luas area genangan dan luas kawasan pemukiman pada area genangan banjir pasang di Kecamatan Sayung, Kabupaten Demak. Metode yang digunakan dalam penelitian ini adalah metode deskriptif yang bersifat eksploratif yaitu bertujuan untuk menggambarkan keadaan atau status fenomena. Penelitian ini dapat memberikan gambaran tentang situasi dan kondisi secara lokal dan hasilnya tidak dapat digeneralisasikan untuk waktu dan tempat yang berbeda. Selain itu perlu diketahui faktor-faktor penyebab banjir pasang di wilayah tersebut. Data utama yang dibutuhkan adalah data pasang surut, Digital Elevation Model (DEM), titik verifikasi banjir pasang pada kawasan pemukiman,peta tata guna lahan Kabupaten Demak tahun 2008 dan peta rupabumi tahun 2001. Berdasarkan hasil dari penelitian ini diketahui bahwa luas genangan banjir pasang yang terjadi di Kecamatan Sayung, Kabupaten Demak pada tahun 2013 adalah 1.938, 42 ha dan luas kawasan pemukiman pada area genangan sebesar 140,05 ha.Laju kenaikan Pasang surut tinggi tertinggi (HHWL) High highest Water Level dari tahun 2004 sampai tahun 2013 adalah sebesar 13.63 dan nilai HHWL tertinggi yang digunakan untuk membuat genangan banjir pasang dalam penelitian ini adalah bulan desember tahun 2013 sebesar 235.09 cm. Sedangkan Tipe pasang surut yang ada perairan Kecamatan Sayung, Kabupaten Demak adalah campuran condong harian tunggal.Kata kunci : Genangan, Banjir, Pasang, Kawasan Pemukiman, Kecamatan Sayung, Kabupaten DemakSubdistrict Sayung, Demak is the frequent flooding in residental areas. Flood tides inunndated areas which have a height of land area equal with the sea surface or lower than the sea surface. The areas thatoften Floods are Sriwulan Village, Purwosari Village, Sidogemah Village,Tugu Village, Surodadi Village, Gemulak Village, Bedono Village and Timbul Sloko Village. This happened because high highest water level at that areas, so that the action nasneccesary to overcome or decrease the impact. The purpose of this research was to determine the highest tidalrise in every year from the highest HHWL data values of each month in a year with admiralty data processing method from 2004-2013 as well as in the sub-type tidal Sayung, Demak and inundation mapping area and extensive residental areas to tidal inundation area in the district Sayung, Demak - Central Java Province. Method used in this research is descriptive explorative method that intoonded to describle the state or status of phenomenom. This research can provide an overvieuw of situation and conditions locally and the results may not generalizable to a different time and place. Besides that we need to known the causing factors of flooding in the region the main data we need required tidal flooding data, DEM (Digital Elevation Model), verification point in the settlement area, land use maps Demak in 2008 and 2001 topographical map. Based on the result of this research that widespread inundation flooding that occured in the district Sayung Demak in 2013 is 1.938,42 ha and extensive of residental areas to the inundation area of 140.05 ha. The rate of the highest tidal rise (HHWL) from 2004 to 2013 amounted 13.63 and the highest value of HHWL used to create tidal inundation in the study was desember 2013 amounted to 235.09 cm. While type of tidal waters that exist in the district Sayung, Demak is a mixture of single-learning daily.Keywords : Inundated, Flood Tide, Settlements, Subdistrict Of Sayung, Demak Regency

scholarly journals Analisis Potensi Genangan Tsunami dan Penentuan Jalur Evakuasi Berbasis Sistem Informasi Geografis di Desa Daruba Pantai – Kabupaten Pulau Morotai

2021 ◽  
Vol 9 (1) ◽  
pp. 79-91
Author(s):  
Mohammad Ridwan Lessy ◽  
Nurhalis Wahiddin ◽  
Jefry Bemba ◽  
Marwis Aswan
Keyword(s):  
Digital Elevation Model ◽  
Active Faults ◽  
Safety Zone ◽  
Tsunami Inundation ◽  
Inundation Area ◽  
Digital Elevation ◽  
Study Results ◽  
Neighborhood Unit ◽  
Elevation Model ◽  
Evacuation Route

Tsunami is one of the catastrophic events that threatened coastal areas in Morotai Island Regency. This is partly because the location of the regency is among several active faults. Therefore, the study aims to analyze the tsunami inundation area and determine a tsunami evacuation route in Daruba Pantai Village, South Morotai District. This study begins with the preparation of a digital elevation model and is compiled with other related maps to produce the tsunami inundation area at the study site. The study results show that a tsunami can hit 176.65 ha, with the disastrous and dangerous category being 5.02% and 0.66%. Meanwhile, specifically for the Daruba Pantai Village area with an area of 60.59 ha, the disastrous and dangerous categories are 10.72% and 1.30%, and the safe category is 36.61% and secure 23.07%. Furthermore, the preparation of the evacuation route is based on the scenario that residents from each zone of both the Neighborhood Unit (RT) and Community Unit (RW) are directed to follow the evacuation path to move towards the temporary shelter point and towards the safety zone.

Application of the high-resolution digital elevation model in an integrated numerical method for the occurrence mechanism and post-failure behavior of the landslide

2021 ◽  
Author(s):  
YuanJung Tsai ◽  
WeiLin Lee
Keyword(s):  
High Resolution ◽  
Numerical Model ◽  
Monitoring System ◽  
Digital Elevation Model ◽  
Large Scale ◽  
Specific Region ◽  
Digital Elevation ◽  
Unstable Slope ◽  
Elevation Model ◽  
Potential Area

<p>In 2009, a large-scale landslide was triggered by typhoon rainfall and buried an entire village, which named Hsiaolin and located in Taiwan. <br>After that, Soil and Water Conservation Bureau (SWCB) has promoted a national project for the prevention work of large-scale landslide. The national project includes with the investigation of potential area, the design of monitoring system, and the design of warning system, etc. <br>The investigation of potential large-sclae landslide was based on the  digital elevation model with 1 meter resolution. However, the investigation of the underground was lack and not clear enough. Therefore, the specific landslide's body is hardly to estimate and it causes difficulty in follow-up works. <br>This study applied two methods to investigate the scenario of slope failure. The first method is based on the limited equilibrium method, which proposed by Yoshino and Uchida (2019). The method was used to search the specific region of unstable slope based on a series of high-resolution digital elevation models. After the specific region of unstable slope was confirmed, the landslide can be simulated by a numerical model, which this study proposed to represent the entire landslide process from occurrence to post-failure . <br>These proposed methods were applied at Baolai area, south Taiwan to track the evolution of the potential area. The failure scenario could be evaluated by the proposed numerical model. By this study, the investigation of underground can be evaluated and these results are very important information for the design of monitoring system.</p>

scholarly journals COMPARAÇÃO DE MÉTODOS DE INTERPOLAÇÃO E ANÁLISE ESPACIAL EM DADOS DE pH, EM BOTUCATU-SP

Irriga ◽  
2003 ◽  
Vol 8 (1) ◽  
pp. 21-28
Author(s):  
Luciana Corpas Bucene ◽  
Célia Regina Lopes Zimback
Keyword(s):  
Digital Elevation Model ◽  
Inverse Distance Weighting ◽  
Information Modeling ◽  
Geographical Information ◽  
Data Interpolation ◽  
Digital Elevation ◽  
Distance Weighting ◽  
Elevation Model ◽  
E Mail ◽  
Inverse Distance

COMPARAÇÃO DE MÉTODOS DE INTERPOLAÇÃO E ANÁLISE ESPACIAL EM DADOS DE pH, EM BOTUCATU-SP1 Luciana Corpas BuceneFaculdade de Engenharia Agrícola, Universidade Estadual de Campinas, Campinas, SP. CP 6011, CEP 13083-970. E-mail: [email protected]élia Regina Lopes ZimbackDepartamento de Recursos Naturais ,Faculdade de Ciências Agronômicas,Universidade Estadual Paulista, Botucatu, SP. CP 237, CEP 18603-970. E-mail: [email protected]  1 RESUMO  O termo Modelo Numérico do Terreno (MNT) é utilizado para denotar a representação quantitativa de uma grandeza que varia continuamente no espaço. Podem ser utilizados para modelar informações relativas às propriedades do solo, como pH do solo. Nesse sentido, a análise espacial oferece uma complexa quantidade de ferramentas que fornecem estimativas para locais não amostrados, servindo-se de Sistemas de Informações Geográficas (SIG’s). Algumas técnicas de interpolação de dados são comumente utilizadas para interpolação de dados pontuais para locais não amostrados. Neste trabalho, comparou-se dois métodos de interpolação de dados, através de técnicas de geoestatísticas, avaliando o método da Krigagem e o método do Quadrado do Inverso da Distância, utilizando-se do interpolador Interpol, ambos disponíveis no SIG IDRISI, para a obtenção do Modelo Numérico do Terreno. Os resultados indicam que o método pela Krigagem é mais acentuado por representar uma superfície contínua e com boa distribuição, numa estrutura de semivariância que permitiu um ajuste cuja correlação entre valores observados e preditos foi de 0.9001, sugerindo uma possibilidade de estimar valores não amostrados de forma confiável.  UNITERMOS: Interpolação de dados, geoestatística, quadrado do inverso da distância e Krigagem.  BUCENE, L. C., ZIMBACK, C. R. L. COMPARISON OF INTERPOLATION AND SPACIAL ANALYSIS METHOD IN PH SOIL DATA, IN BOTUCATU-SP  2 ABSTRACT  The Digital Elevation Model (DEM) term has been used for a greatness quantitative representation which varies continuously in the space. It can be used for information modeling related to soil properties such as pH soil . Thus, spatial analysis offers a complex number of tools which provide estimates for non-sampled places through Geographical Information System (GIS). Some data interpolation techniques have been usually used for punctual data in non-sampled places. In this work two data interpolation methods have been compared using geostatistics techniques in order to evaluate the Kriging and Inverse Distance Weighting methods. The Interpol interpolator has been used to have the Digital Elevation Model, both available at SIG IDRISI. The results showed that the Kriging method is more accentuated due to a continuous surface representation and good distribution. The 0.9001 correlation between estimated and observed data has been obtained suggesting a reliable data estimating possibility for non-sampled values.  KEYWORDS: Data interpolation, geostatistics, inverse distance weighting and Kriging.

scholarly journals Ecological Niche Modelling using satellite data for assessing distribution of threatened species Ceropegia bulbosa Roxb.

2014 ◽  
Vol XL-8 ◽  
pp. 597-603
Author(s):  
S. Kumar ◽  
R. N. Kulloli ◽  
J. C. Tewari ◽  
J. P. Singh ◽  
A. Singh
Keyword(s):  
Digital Elevation Model ◽  
Satellite Data ◽  
Thermal Emission ◽  
Geographical Information ◽  
Niche Modelling ◽  
Digital Elevation ◽  
Bioclimatic Variables ◽  
Ground Truthing ◽  
Elevation Model ◽  
Ceropegia Bulbosa

<i>Ceropegia bulbosa</i> Roxb. is a narrow endemic, tuberous twiner of Asclepiadaceae family. It is medicinally important: tubers are nutritive and edible, leaves are digestive and a cure for dysentery and diarrhea. Exploitation for its tubers and poor regeneration of this species has shrunk its distribution. In order to know its present status, we report here the results of its appraisal in Rajasthan, using remote sensing and ground truthing in the past five years (2009&ndash;14). A base map of <i>C. bulbosa</i> was prepared using Geographical Information System (GIS), open source software Quantum GIS, SAGA. The Landsat Enhanced Thematic Mapper (ETM) +Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Global Digital Elevation Model (GDEM) Satellite Data were used in this study. ASTER and GDEM Data was clipped with district boundary and provided color range to get elevation information. A digital elevation model of Rajasthan physiography was developed from ASTER GDEM of 30-m resolution. GIS layers of Area of occurrences for <i>C. bulbosa</i> plant and elevation were created. This map along with topographic sheets of 1:50000 were used for field traversing and ground truthing as per GPS location inferred from map. Its geographic distribution was assessed using MaxEnt distribution modelling algorithm that employed 12 presence locality data, 19 bioclimatic variables, and elevation data. Results of this modelling predicted occurrence of <i>C. bulbosa</i> in the districts of Sirohi, Jalore, Barmer, Pali, Ajmer, Jhalawar, Dungarpur, Banswara, Baran, Kota, Bundi and Chittorgarh. Ground validation in these districts revealed its presence only at four places in three districts confirming its rarity. Analysis of dominance at their sites of occurrence revealed their poor populations and sub dominant status (RIV = 20&ndash;32) and very low density (2&ndash;12 plants per tenth ha).

STUDY OF THE LANDSLIDE MORPHOLOGY BASED ON GNSS DATA AND AIRBORNE SOUNDING (ON THE EXAMPLE OF A SECTION OF THE PROTVA RIVER VALLEY)

2018 ◽  
Vol 12 (5-6) ◽  
pp. 50-57 ◽  
Author(s):  
I. S. Voskresensky ◽  
A. A. Suchilin ◽  
L. A. Ushakova ◽  
V. M. Shaforostov ◽  
A. L. Entin ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Geodetic Network ◽  
Aerial Survey ◽  
River Valley ◽  
Ease Of Use ◽  
Digital Elevation ◽  
Loose Deposits ◽  
Positioning Method ◽  
Landslide Body ◽  
Elevation Model

To use unmanned aerial vehicles (UAVs) for obtaining digital elevation models (DEM) and digital terrain models (DTM) is currently actively practiced in scientific and practical purposes. This technology has many advantages: efficiency, ease of use, and the possibility of application on relatively small area. This allows us to perform qualitative and quantitative studies of the progress of dangerous relief-forming processes and to assess their consequences quickly. In this paper, we describe the process of obtaining a digital elevation model (DEM) of the relief of the slope located on the bank of the Protva River (Satino training site of the Faculty of Geography, Lomonosov Moscow State University). To obtain the digital elevation model, we created a temporary geodetic network. The coordinates of the points were measured by the satellite positioning method using a highprecision mobile complex. The aerial survey was carried out using an unmanned aerial vehicle from a low altitude (about 40–45 m). The processing of survey materials was performed via automatic photogrammetry (Structure-from-Motion method), and the digital elevation model of the landslide surface on the Protva River valley section was created. Remote sensing was supplemented by studying archival materials of aerial photography, as well as field survey conducted immediately after the landslide. The total amount of research results made it possible to establish the causes and character of the landslide process on the study site. According to the geomorphological conditions of formation, the landslide refers to a variety of landslideslides, which are formed when water is saturated with loose deposits. The landslide body was formed with the "collapse" of the blocks of turf and deluvial loams and their "destruction" as they shifted and accumulated at the foot of the slope.

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