scholarly journals Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2048 ◽  
Author(s):  
Lea Dasallas ◽  
Yeonsu Kim ◽  
Hyunuk An
Keyword(s):  
Army Corps ◽  
Urban Flooding ◽  
Army Corps Of Engineers ◽  
Flood Events ◽  
Weather Extremes ◽  
Flood Modeling ◽  
Overbank Flow ◽  
Analysis System ◽  
Disaster Control

Recent studies strongly suggest the possibility of more frequent extreme events as a result of the changing climate. These weather extremes, such as excessive rainfall, result in debris flow, river overflow and urban flooding, which can pose a substantial threat to the community. An effective flood model is therefore a crucial tool in flood disaster control and mitigation. A number of flood models have been established in recent years. However, the major challenge in developing effective and accurate flood models is the disadvantage of running multiple models for separate, individual conditions. Among the solutions in recent research is the development of combined 1D–2D flood modeling. Coupled 1D–2D flood modeling allows the channel flows to be represented in 1D and the overbank flow to be modeled in 2D. In order to test the efficiency of the approach, this research aims to assess the capability of the U.S. Army Corps of Engineers Hydrologic Engineering Center River Analysis System (HEC-RAS) model’s implementation of the combined 1D–2D hydraulic computation in simulating river overflow inundation. For verification, the simulation is applied to the Baeksan river levee breach event in South Korea in 2011. The simulation results show similarities of the observed data and the outputs from widely used flood models. This proves the applicability of the HEC-RAS 1D–2D coupling method as a powerful tool in simulating accurate inundations for flood events.

scholarly journals Flood Hydraulic Analyses: A Case Study of Amik Plain, Turkey

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2070
Author(s):  
Fatih Üneş ◽  
Yunus Ziya Kaya ◽  
Hakan Varçin ◽  
Mustafa Demirci ◽  
Bestami Taşar ◽  
...  
Keyword(s):  
Numerical Models ◽  
Google Earth ◽  
Flood Hazards ◽  
Flood Events ◽  
Calculation Methods ◽  
Loss Of Life ◽  
System Module ◽  
Analysis System ◽  
Amik Plain

In recent years, significant flood events have occurred in various parts of the world. The most important reasons for these events are global warming and consequent imbalances in climate and rainfall regimes. Many studies are performed to prevent the loss of life and property caused by floods. Many methods have been developed to predict future floods and possible affected areas. Developing computer and numerical calculation methods gives opportunities to make simulations of flood hazards. One of the affected areas, which is also one of the world’s first residential districts at Hatay in Turkey, is the Amik Plain. In this study, the floods on the Amik Plain in Hatay province are analyzed. Hatay airport was also affected during floods since 2012 and serious material damage occurred. For this purpose, Google Earth Pro software was used to obtain maps of the basin where the airport is located and the rivers it contains. Afterwards, Hydrologic Engineering Center’s River Analysis System module (HEC-RAS) was used for the hydraulic and hydrological definitions of the river basin. The results of numerical models are presented as simulated maps.

Expanding catchment-scale hydrologic restoration in suburban watersheds via stream mitigation crediting—A Northern Kentucky (USA) case study

2021 ◽  
Author(s):  
Robert J Hawley
Keyword(s):  
Habitat Restoration ◽  
Control Measures ◽  
Mitigation Measures ◽  
Intermittent Flow ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Catchment Scale ◽  
Us Army ◽  
Hydrologic Restoration

Abstract The need for hydrologic restoration is well established in stream ecosystems across the world; however, available funding for catchment-scale restoration typically falls far short of what is required to produce in-stream results. Hydrologic restoration can be particularly important for improving stream integrity in urban watersheds, but implementation can be challenging due to high property values and limited space for retroactive stormwater control measures. This Northern Kentucky (USA) case study summarizes how stormwater mitigation interventions could be, and have already been, used to credit stream mitigation projects via conventional US Army Corps of Engineers crediting protocols. Hydrologic restoration can generate stream mitigation credits by directly improving the flow class and/or by indirectly improving the habitat quality. For example, a stormwater intervention could create a shift from an ephemeral to intermittent flow class, while at the same time facilitating greater substrate stability, lower embeddedness, and other geomorphic improvements, that subsequently improve the categorical habitat rating. The ecological lift of such hydrologic interventions could be further expanded via concurrent in-stream mitigation measures such as re-establishing a jurisdictional stream in place of a drainage ditch or installing habitat structures such as toe wood and log steps, among other activities. Such process-based hydrologic restoration is consistent with the goals of the Clean Water Act and has the potential to be more beneficial to greater portions of stream networks and greater numbers of stakeholders than conventional habitat restoration alone.

scholarly journals Korelasi Klasifikasi Penutup Lahan dengan Debit Puncak di Daerah Aliran Sungai

2017 ◽  
Vol 23 (2) ◽  
pp. 157
Author(s):  
Sri Sangkawati Sachro ◽  
Sutarto Edhisono ◽  
Pranoto Samto Atmodjo ◽  
Wahyu Prasetyo
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Peak Discharge ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Us Army ◽  
Preliminary Study ◽  
Runoff Discharge ◽  
Engineering Centre

Many studies have shown that land use changes in watersheds such as forests that convert to settlements, industrial and estates, have an impact on flooding. So it is important to know the correlation between the various land use changes to the discharge within a watershed. This study is a preliminary study in an attempt to assess the correlation between land cover index and peak discharge, with case studies in the Beringin River Basin.The peak discharge with the return period of 2, 5, 10, 20, 50 and 100 years are computed with HEC-HMS software, developed by Hydrologic Engineering Centre (HEC) and US Army Corps of Engineers which computes the runoff discharge from the precipitation. As for land covered index (LCI), it is defined as the sum of the land-use index (LUI). The result of the case study shows the strong correlation between the land covered index with the the runoff discharge with such relation : Q100 = -22.42LCI2 + 214.30LCI - 10.62, Q50 = -18.33LCI2 + 181.87LCI - 20.19, Q20 = -14.30LCI2 + 145.27LCI - 15.61, Q10 = -11.36LCI2 + 118.41LCI - 12.29, Q5 = -8.42LCI2 + 91.27LCI - 8.9 and Q2 = -4.44LCI2 + 53.54LCI - 4.5.

A combined GIS and HEC model for the analysis of the effect of urbanization on flooding; the Swan Creek watershed, Ohio

2002 ◽  
Vol 8 (1) ◽  
pp. 47-61 ◽  
Author(s):  
Jason J. Wiles ◽  
Norman S. Levine
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Army Corps ◽  
Flood Modeling ◽  
Creek Watershed ◽  
Runoff Modeling ◽  
Hydrologic System ◽  
Recurrence Intervals ◽  
Analysis System ◽  
Lucas County

Abstract This study investigates the effects of changes in land-use on the hydrology of the Swan Creek watershed in Lucas County, Ohio, over a thirty-year period. The study presents the GIS based runoff models and the HEC-RAS Flood analysis for the watershed. The runoff modeling was performed using a modification of the rational formula first proposed by Rossmiller in 1980. The C factor (land use) in the rational equation (Q = CIA) is modified to account for land use, soil type and slope factors. Four model runs for each of the land-use coverages were created based on the statistical precipitation recurrence intervals: P 10 , P 25 , P 50 , P 100 (a total of 12 model runs). The models differed only in the basic land-use classifications for each decade of interest. The runoff analysis predicts that increased runoff volumes in the watershed are directly related to increasing urbanization. The study showed that runoff volumes of a P 100 storm in 1973 of certain sub-basins has the equivalent runoff of a P 10 storm in 1995. The flood modeling was performed in the Army Corps of Engineer's Hydrologic Engineering Center's River Analysis System (HEC-RAS). Twelve model runs were also created in HEC-RAS to evaluate the effect of the land-use changes in each of the time periods for each of the storms. The study showed that flood extent of a P 50 storm in 1973 across the watershed has the equivalent flood extent of a P 10 storm in 1995. The flood modeling predicts that the Swan Creek hydrologic system responds more quickly and severely today to events that would have been smaller in the past.

scholarly journals Expanding catchment-scale hydrologic restoration in suburban watersheds via stream mitigation crediting—A Northern Kentucky (USA) case study

2021 ◽  
Author(s):  
Robert J. Hawley
Keyword(s):  
Habitat Restoration ◽  
Control Measures ◽  
Mitigation Measures ◽  
Intermittent Flow ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Catchment Scale ◽  
Us Army ◽  
Hydrologic Restoration

AbstractThe need for hydrologic restoration is well established in stream ecosystems across the world; however, available funding for catchment-scale restoration typically falls far short of what is required to produce in-stream results. Hydrologic restoration can be particularly important for improving stream integrity in urban watersheds, but implementation can be challenging due to high property values and limited space for retroactive stormwater control measures. This Northern Kentucky (USA) case study summarizes how stormwater mitigation interventions could be, and have already been, used to credit stream mitigation projects via conventional US Army Corps of Engineers crediting protocols. Hydrologic restoration can generate stream mitigation credits by directly improving the flow class and/or by indirectly improving the habitat quality. For example, a stormwater intervention could create a shift from an ephemeral to intermittent flow class, while at the same time facilitating greater substrate stability, lower embeddedness, and other geomorphic improvements, that subsequently improve the categorical habitat rating. The ecological lift of such hydrologic interventions could be further expanded via concurrent in-stream mitigation measures such as re-establishing a jurisdictional stream in place of a drainage ditch or installing habitat structures such as toe wood and log steps, among other activities. Such process-based hydrologic restoration is consistent with the goals of the Clean Water Act and has the potential to be more beneficial to greater portions of stream networks and greater numbers of stakeholders than conventional habitat restoration alone.

scholarly journals The Viability and Simplicity of 3D-Printed Construction: A Military Case Study

2020 ◽  
Vol 5 (4) ◽  
pp. 35
Author(s):  
Jeneé Jagoda ◽  
Brandy Diggs-McGee ◽  
Megan Kreiger ◽  
Steven Schuldt
Keyword(s):  
Environmental Impact ◽  
Process Efficiency ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Construction Engineering ◽  
Engineering Research ◽  
Construction Methods ◽  
3D Printed ◽  
Development Center

In November 2019, U.S. Marines, Air Force, and Army Corps of Engineers personnel demonstrated the viability and simplicity of three-dimensionally (3D)-printed construction in a controlled environment at the U.S. Army Engineer Research and Development Center—Construction Engineering Research Laboratory in Champaign, Illinois. The tri-service exercise spanned three days and culminated in the construction of three 1 m × 1 m × 1 m (3 ft × 3 ft × 3 ft) concrete dragon’s teeth (square pyramid military fortifications used to defend against tanks and armored vehicles) and several custom-designed objects. The structural components were printed using a custom-built, gantry-style printer called ACES Lite 2 and a commercially available, proprietary mortar mix. This paper examines the viability of using 3D-printed construction in remote, isolated, and expeditionary environments by considering the benefits and challenges associated with the printing materials, structural design, process efficiency, labor demands, logistical considerations, environmental impact, and project cost. Based on the results of this exercise, 3D-printed construction was found to be faster, safer, less labor-intensive, and more structurally efficient than conventional construction methods: the dragon’s teeth were printed in an average of 57 min each and required only two laborers. However, the use of commercially procured, pre-mixed materials introduced additional cost, logistical burden, and adverse environmental impact as compared to traditional, on-site concrete mixing and production. Finally, this paper suggests future applications and areas of further research for 3D-printed construction.

Engineering and Construction Expertise Transfusion at the U.S. Army Corps of Engineers: A KM case study

10.29007/59pd ◽  
2018 ◽  
Author(s):  
Eugene A Morisani ◽  
Salman Azhar ◽  
Irfan Ulhaq ◽  
Malik Khalfan ◽  
Tayyab Maqsood
Keyword(s):  
Communities Of Practice ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Corps Of Engineers ◽  
District Office ◽  
Technical Competency ◽  
Information Skills ◽  
The U.S ◽  
Do So

Knowledge Management (KM) is the collection and transfusion of the organization’s critical information, skills, experience, and identity, held by senior individuals, to successor generations for action. A great deal of the technical expertise in the U.S. Army Corps of Engineers (USACE) has been departing through the retirement of the most experienced employees over the last several years and continues to do so today. Without robust technical competency, an organization as large as USACE cannot continue to perform design and construction functions effectively. This research study defines KM, reviews best practices from industry and assesses how USACE is performing at the working level. The research data obtained identified key needs and subsequent recommendations for additional efforts or improvements to existing initiatives. Data was collected through interviews of eight managers at a USACE District Office to make assessments and determine steps to be taken to ensure critical expertise is retained and mission execution continues effectively. This study found that at the working level the current KM program is primarily based on mentoring and informal communities of practice, and not in top-down information systems based approaches. USACE would benefit greatly from reconciling different approaches, eliminating redundant items, and a coordinated approach at all levels of leadership to champion processes that work.

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