Spatial comparisons in wetland loss, mitigation, and flood hazards among watersheds in the lower St. Johns River basin, northeastern Florida, USA

2021 ◽  
Author(s):  
Nisse Goldberg ◽  
Russell L. Watkins
Keyword(s):  
River Basin ◽  
Wetland Loss ◽  
Flood Hazards ◽  
Loss Mitigation

scholarly journals Identification of Flood-prone Areas using HEC-HMS and HEC-RAS, the Case of Ciberang River Basin, Lebak District of Banten Province

2021 ◽  
Vol 930 (1) ◽  
pp. 012082
Author(s):  
Ynaotou ◽  
R Jayadi ◽  
A P Rahardjo ◽  
D A Puspitosari
Keyword(s):  
River Basin ◽  
Human Life ◽  
Control Point ◽  
Flood Damage ◽  
Level Gauge ◽  
Flood Hazards ◽  
Channel Routing ◽  
Flood Prediction ◽  
Discharge Data ◽  
Flood Prone Areas

Abstract It is common practice that flood hydrograph simulations help to provide better flood prediction and flood damage reduction planning. These efforts require information on flood-prone areas identification from the hydrological and hydraulic analysis results. Historically, the Ciberang River Basin has experienced floods. Those floods cause the loss of human life and damage some houses along the river’s channels, especially in Lebak District, Banten Province, Indonesia. The main objective of this study is to identify flood-prone areas based on the simulation result of a hydrologic and hydraulic model of catchment response due to several extreme rainfall events using HEC-HMS and HEC-RAS software. Rainfall and discharge data measured at the Ciberang-Sabagi water level gauge on 10 January 2013 were used to calibrate hydrological watershed parameters. The hydraulics channel routing is started from the planned location of the Sabo dam to the downstream control point. The next stage was the simulation of rainfall-runoff transformation and 1D unsteady flow channel routing for the 2, 5, and 10-years floods return periods. The main result of this study is a flood hazards map that shows the spatial distribution of the area and inundation depth for each return period of the flood.

Flood monitoring using Sentinel-1 SAR images in Pearl River basin

2021 ◽  
Author(s):  
Qiu Junliang ◽  
Bowen Cao ◽  
Paolo Tarolli ◽  
Wenxin Zhang ◽  
Xiankun Yang
Keyword(s):  
River Basin ◽  
Pearl River ◽  
Flood Hazards ◽  
Pearl River Basin ◽  
Urban Flood ◽  
Flood Peak ◽  
Flood Monitoring ◽  
Land Cover Map ◽  
High Flood ◽  
The Pearl River

<p>The Pearl River Basin (PRB), as the second largest basin in China and one of the densely populated areas in China, is a critical region that exposes to high flood risks. Thus, it is indispensable to monitor the flooding patterns in PRB, so as to understand the flooding mechanism and better respond to the flood hazards. Previous studies about flood monitoring in PRB were mainly conducted by using gauging data of hydrological stations. However, the flood monitoring results would be prone to deviation in the region where the hydrological stations were sparse or without hydrological stations. Moreover, previous studies mainly focused on the urban flood in metropolis in PRB, neglecting the flood extents in rural area, in which the agriculture lands were constantly inundated by flooding water body. To monitor flood more comprehensively, this study will combine hydrological data, precipitation data with Sentinel-1 images to investigate spatial patterns of flood peak and flood extents in PRB. In addition, this study will also combine flood extents with land cover map to calculate the inundated areas of cropland during flood periods. This study will be valuable for flood mitigation, flood prevention and food guarantee in PRB.</p>

scholarly journals Assessment of Flood Hazard and Agriculture Damage Under Climate Change in the Bagmati River Basin of Nepal

2019 ◽  
Vol 8 (2) ◽  
pp. 55-69 ◽  
Author(s):  
Badri Bhakta Shrestha
Keyword(s):  
River Basin ◽  
Flood Risk ◽  
Damage Assessment ◽  
Growth Stage ◽  
Flood Hazard ◽  
Flood Damage ◽  
Flood Risk Management ◽  
Flood Inundation ◽  
Flood Hazards ◽  
Bagmati River

Assessment of flood hazard and damage is a prerequisite for flood risk management in the river basins. The mitigation plans for flood risk management are mostly evaluated in quantified terms as it is important in decision making process. Therefore, analysis of flood hazards and quantitative assessment of potential flood damage is very essential for mitigating and managing flood risk. This study focused on assessment of flood hazard and quantitative agricultural damage in the Bagmati River basin including Lal Bakaiya River basin of Nepal under climate change conditions. Flood hazards were simulated using Rainfall Runoff Inundation (RRI) model. MRI-AGCM3.2S precipitation outputs of present and future climate scenarios were used to simulate flood hazards, flood inundation depth, and duration. Flood damage was assessed in the agricultural sector, focusing on flood damage to rice crops. The flood damage assessment was conducted by defining flood damage to rice crops as a function of flood depth, duration, and growth stage of rice plants and using depth-duration-damage function curves for each growth stage of rice plants. The hazard simulation and damage assessment were conducted for 50- and 100-year return period cases. The results show that flood inundation area and agricultural damage area may increase in the future by 41.09 % and 39.05 % in the case of 50-year flood, while 44.98 % and 40.76 % in the case of 100-year flood. The sensitivity to changes in flood extent area and damage with the intensity of return period was also analyzed.

scholarly journals Flood hazards in the upper and middle Odra River basin – A short review over the last century

Limnologica ◽  
2005 ◽  
Vol 35 (3) ◽  
pp. 123-131 ◽  
Author(s):  
Alfred Dubicki ◽  
Józefa Malinowska-Małek ◽  
Kinga Strońska
Keyword(s):  
River Basin ◽  
Short Review ◽  
Flood Hazards ◽  
Odra River

scholarly journals More frequent flooding? Changes in flood frequency in the Pearl River basin, China, since 1951 and over the past 1000 years

2018 ◽  
Vol 22 (5) ◽  
pp. 2637-2653 ◽  
Author(s):  
Qiang Zhang ◽  
Xihui Gu ◽  
Vijay P. Singh ◽  
Peijun Shi ◽  
Peng Sun
Keyword(s):  
River Basin ◽  
Pearl River ◽  
Flood Hazards ◽  
Flood Events ◽  
Pearl River Basin ◽  
The Past ◽  
The Pearl River ◽  
Flood Flow ◽  
Past 1000 Years ◽  
Peak Flood

Abstract. Flood risks across the Pearl River basin, China, were evaluated using a peak flood flow dataset covering a period of 1951–2014 from 78 stations and historical flood records of the past 1000 years. The generalized extreme value (GEV) model and the kernel estimation method were used to evaluate frequencies and risks of hazardous flood events. Results indicated that (1) no abrupt changes or significant trends could be detected in peak flood flow series at most of the stations, and only 16 out of 78 stations exhibited significant peak flood flow changes with change points around 1990. Peak flood flow in the West River basin increased and significant increasing trends were identified during 1981–2010; decreasing peak flood flow was found in coastal regions and significant trends were observed during 1951–2014 and 1966–2014. (2) The largest three flood events were found to cluster in both space and time. Generally, basin-scale flood hazards can be expected in the West and North River basins. (3) The occurrence rate of floods increased in the middle Pearl River basin but decreased in the lower Pearl River basin. However, hazardous flood events were observed in the middle and lower Pearl River basin, and this is particularly true for the past 100 years. However, precipitation extremes were subject to moderate variations and human activities, such as building of levees, channelization of river systems, and rapid urbanization; these were the factors behind the amplification of floods in the middle and lower Pearl River basin, posing serious challenges for developing measures of mitigation of flood hazards in the lower Pearl River basin, particularly the Pearl River Delta (PRD) region.

scholarly journals The effects of climate change on flood hazards in Kelantan River Basin Malaysia

2021 ◽  
Vol 880 (1) ◽  
pp. 012016
Author(s):  
Tze Huey Tam ◽  
Muhammad Zulkarnain Abd Rahman ◽  
Sobri Harun ◽  
Sophal Try ◽  
Ismaila Usman Kaoje ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Hydrological Cycle ◽  
Flood Hazard ◽  
Future Climate ◽  
Mitigation Strategies ◽  
Flood Hazards ◽  
Distributed Hydrological Model ◽  
Climate Scenarios ◽  
Kelantan River Basin

Abstract Climate change has had a significant impact on the hydrological cycle, causing changes in precipitation patterns in both frequency and magnitude. The aim of this study is to assess the effect of climate change on flood hazards in Kelantan River Basin, Malaysia. A distributed hydrological model called Rainfall-Runoff-Inundation (RRI) simulates floods under current and future climate scenarios. The Climate Change Factor (CCF) is a tool for forecasting future climate scenarios. The storm used in this analysis had 50-year and 100-year recurrence intervals every 24 hours (ARI). The finding shows that the streamflow in Guillemard station will increase in the future for both the 50- and 100-year ARI. The streamflow increased to 10329 m3/s from 8434.9 m3/s in the current state and to 11220.2 m3/s from 9157.4 m3/s in the 50- and 100-year ARI, respectively. In both cases, the 100-year ARI flood magnitude is significantly less than the 50-year ARI flood extent (current and future). However, the flood depth in several towns located downstream of the Kelantan River Basin is more significant for the 100-year ARI than for the 50-year ARI for both cases. The study’s findings would be helpful to relevant agencies and government departments understand the current and potential flood hazard situation in the study area and assist them in developing effective mitigation strategies for future flood hazards.

scholarly journals The Analysis of the Degree of Flood Risk in the Middle Bobr Valley

2018 ◽  
Vol 28 (2) ◽  
pp. 68-75
Author(s):  
Magda Hudak ◽  
Urszula Kołodziejczyk ◽  
Jakub Kostecki ◽  
Ireneusz Nowogoński ◽  
Marta Żebrowska
Keyword(s):  
River Basin ◽  
Flood Risk ◽  
Land Development ◽  
Anthropogenic Factors ◽  
Flood Hazards ◽  
Flood Risks ◽  
The Impact ◽  
The Town ◽  
Geographical Characteristics ◽  
Rainfall Level

Abstract This paper presents the impact of rainfall on the degree of flood risk in the basin of the middle Bobr River in western Poland. When the average rainfall level reaches 15 to 20 mm, this apparently calm river may dramatically change its character within just one week. The most important flood risks are flood waves in the headwaters. Because of the mountain character of the river basin, during intensive rainfall there is a huge surface runoff and the water level rises rapidly in the river. This phenomenon was observed in June 2017 in the town of Zagan (Lubuskie Voivodeship). It has been shown that the course and dynamics of hydrological processes occurring in the Bobr River basin depend on its physical and geographical characteristics and the influence of anthropogenic factors. The location is one of the main cause of numerous floods for Zagan, on the other hand changes in land development plays significant meaning in flood hazards. Continuous monitoring of the river is the basis for a comprehensive forecast of flood risks.

scholarly journals Flood hazard modelling and risk assessment in the Nadi River Basin, Fiji, using GIS and MCDA

2012 ◽  
Vol 30 (1) ◽  
pp. 33 ◽  
Author(s):  
Jessy Paquette ◽  
John Lowry
Keyword(s):  
River Basin ◽  
Census Data ◽  
Flood Hazard ◽  
Effective Means ◽  
Central Business District ◽  
Primary Data ◽  
Flood Hazards ◽  
Location Data ◽  
Gis Data ◽  
Business District

This paper presents a simple and affordable approach to flood hazard assessment in a region where primary data are scarce. Using a multicriteria decision analysis (MCDA) approach coupled with GIS layers for elevation, catchments, land-use, slope, distance from channel, and soil types, we model the spatial extent of flood hazard in the Nadi River basin in western Fiji. Based on the flood hazard model results we assess risk to flood hazards in the greater Nadi area. This is carried out using 2007 census data and building location data obtained from aerial photography. The flood model reveals that the highest hazard areas in Nadi are the Narewa, Sikituru and Yavusania villages followed by the Nadi central business district (Nadi CBD). Closer examination of the data suggests that the Nadi River is not the only flood vector in the area. Several poorly designed storm drains also present a hazard since they get clogged by rubbish and cannot properly evacuate runoff thus creating water build-up. We conclude that the MCDA approach provides a simple and effective means to model flood hazard using basic GIS data. This type of model can help decision makers focus their flood risk awareness efforts, and gives important insights to disaster management authorities.

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