scholarly journals Hydrologic sensitivity of flood runoff and inundation: 2011 Thailand floods in the Chao Phraya River basin

2015 ◽  
Vol 15 (7) ◽  
pp. 1617-1630 ◽  
Author(s):  
T. Sayama ◽  
Y. Tatebe ◽  
Y. Iwami ◽  
S. Tanaka
Keyword(s):  
River Basin ◽  
Flood Hazard ◽  
Economic Damage ◽  
Flood Inundation ◽  
Rainfall Runoff ◽  
The Past ◽  
Basin Scale ◽  
Chao Phraya River ◽  
Large Floods

Abstract. The Thailand floods in 2011 caused unprecedented economic damage in the Chao Phraya River basin. To diagnose the flood hazard characteristics, this study analyses the hydrologic sensitivity of flood runoff and inundation to rainfall. The motivation is to address why the seemingly insignificant monsoon rainfall, or 1.2 times more rainfall than for past large floods, including the ones in 1995 and 2006, resulted in such devastating flooding. To quantify the hydrologic sensitivity, this study simulated long-term rainfall–runoff and inundation for the entire river basin (160 000 km2). The simulation suggested that the flood inundation volume was 1.6 times more in 2011 than for the past flood events. Furthermore, the elasticity index suggested that a 1 % increase in rainfall causes a 2.3 % increase in runoff and a 4.2 % increase in flood inundation. This study highlights the importance of sensitivity quantification for a better understanding of flood hazard characteristics; the presented basin-wide rainfall–runoff–inundation simulation was an effective approach to analyse the sensitivity of flood runoff and inundation at the river basin scale.

scholarly journals Hydrologic sensitivity of flood runoff and inundation: 2011 Thailand floods in the Chao Phraya River basin

2014 ◽  
Vol 2 (11) ◽  
pp. 7027-7059 ◽  
Author(s):  
T. Sayama ◽  
Y. Tatebe ◽  
Y. Iwami ◽  
S. Tanaka
Keyword(s):  
River Basin ◽  
Monsoon Rainfall ◽  
Flood Hazard ◽  
Large River ◽  
Economic Damage ◽  
Flood Inundation ◽  
Rainfall Runoff ◽  
Chao Phraya River ◽  
Large Floods

Abstract. Thailand floods in 2011 caused an unprecedented economic damage in the Chao Phraya River basin. To diagnose the flood hazard characteristics, this study analyzes the hydrologic sensitivity of flood runoff and inundation to rainfall. The motivation is to address why the seemingly insignificant monsoon rainfall, or 1.2 times more rainfall than past large floods including the ones in 1995 and 2006, resulted in such a devastating flooding. To quantify the hydrologic sensitivity, this study simulated a long-term rainfall-runoff and inundation for the entire river basin (160 000 km2). The simulation suggested that the flood inundation volume in 2011 was 1.6 times more than past flood events. Furthermore the elasticity index suggested that 1% increase in rainfall causes 2.3% increase in runoff and 4.2% increase in flood inundation. This study highlights the importance of sensitivity quantification for better understanding of flood hazard characteristics; and the presented approach is effective for the analysis at large river basins.

ANALYSIS OF LONG-TERM RAINFALL-RUNOFF-INUNDATION IN THE CHAO PHRAYA RIVER BASIN

2013 ◽  
Vol 69 (4) ◽  
pp. I_457-I_462
Author(s):  
Yuya TATEBE ◽  
Takahiro SAYAMA ◽  
Tomoki USHIYAMA ◽  
Susumu FUJIOKA ◽  
Shigenobu TANAKA
Keyword(s):  
River Basin ◽  
Rainfall Runoff ◽  
Chao Phraya River

scholarly journals Water accounting for water management at the river basin scale in India: approaches and gaps

Water Policy ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 768-788
Author(s):  
Nitin Bassi ◽  
Guido Schmidt ◽  
Lucia De Stefano
Keyword(s):  
Water Management ◽  
River Basin ◽  
Water Policy ◽  
Past Research ◽  
River Basin Scale ◽  
The Past ◽  
Basin Scale ◽  
Water Accounting ◽  
Accounting Approaches ◽  
National Water

Abstract The main objective of this research paper is to assess the extent to which the concept of water accounting has been applied for water management at the river basin scale in India. For this, the study first assesses the importance given to the use of water accounting for water management in India's national water policy. It then analyses the evolution of water accounting approaches in India through a systematic review of the past research studies on the theme. Further, it looks at their contribution to decision-making concerning allocation of water resources and resolving conflicts over water sharing. Finally, it identifies the existing gaps in the methodologies for water accounting so far used in India.

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 Rainfall-runoff modelling and palaeoflood hydrology applied to reconstruct centennial scale records of flooding and aquifer recharge in ungauged ephemeral rivers

2010 ◽  
Vol 7 (6) ◽  
pp. 9631-9660 ◽  
Author(s):  
G. Benito ◽  
B. A. Botero ◽  
V. R. Thorndycraft ◽  
M. Rico ◽  
Y. Sánchez-Moya ◽  
...  
Keyword(s):  
Return Period ◽  
Stream Flow ◽  
Rainfall Runoff ◽  
Aquifer Recharge ◽  
Flood Duration ◽  
Ephemeral Rivers ◽  
Daily Discharge ◽  
And Storage ◽  
Large Floods

Abstract. In this study we propose a multi-source data approach for quantifying long-term flooding and aquifer recharge in ungauged ephemeral rivers. The methodology is applied to the Buffels River, at 9000 km2 the largest ephemeral river in Namaqualand (NW South Africa), a region with scarce stream flow records limiting research investigating hydrological response to global change. Daily discharge and annual flood series (1965–2006) were estimated from a distributed rainfall-runoff hydrological model (TETIS) using rainfall gauge records located within the catchment. The model was calibrated and validated with data collected during a two year monitoring programme (2005–2006) at two stream flow stations, one each in the upper and lower reaches of the catchment. In addition to the modelled flow records, non-systematic flood data were reconstructed using both sedimentary and documentary evidence. The palaeoflood record identified at least 25 large floods during the last 700 yr; with the largest events reaching a minimum discharge of 255 m3 s−1 (450 yr return period) in the upper basin, and 510 m3 s−1 (100 yr return period) in the lower catchment. Since 1925 AD, the flood hydrology of the Buffels River has been characterised by a decrease in the magnitude and frequency of extreme events, with palaeoflood discharges five times greater than the largest modelled floods during the period 1965–2006. Large floods generated the highest hydrograph volumes, however their contribution to aquifer recharge is limited as this depends on other factors such as flood duration and storage capacity of the unsaturated zone prior to the flood. Floods reaching flows associated with 5–10 yr return periods (120–140 m3 s−1) and flowing for 12 days are able to fully saturate the Spektakel aquifer in the lower Buffels River basin.

scholarly journals Flood Inundation Mapping and Hazard Assessment for Mitigation Analysis of Local Adaption Measures in Upper Ping River Basin, Thailand

2021 ◽  
Author(s):  
Husnain Tansar ◽  
Haseeb Akbar ◽  
Rana Ammar Aslam
Keyword(s):  
River Basin ◽  
Hazard Assessment ◽  
Flood Hazard ◽  
Flood Protection ◽  
Management Approach ◽  
Flood Inundation ◽  
Adaptation Measures ◽  
High Hazard ◽  
Flooded Area ◽  
Set Up

Abstract Annual monsoon flooding phenomena have caused disastrous impacts on the Upper Ping River basin and its inhabitants over the years. The existing administration set-up for flood mitigation and adaptation measures lacks effective utilization of locally available resources for complete flood protection. This study addressed this gap by flood hazard assessment at a lower administration scale (sub-district level) and performance evaluation of local adaptation measures was performed. 1D and 2D hydrodynamic models were developed and calibrated against observed discharge and water level (1D) and flood extent (2D), respectively. Flood inundation and hazard maps were reproduced and categorized into different classes based on defined critical depths for 2, 5, 10, 25, 50 and 100 years return periods. A maximum flood inundated area of 996.9 km2 (3.94% of total basin area) was simulated in a 100-year return period. The flood hazard results represent that the largest flooded area categorized under “high hazard”, followed by “very high hazard” and “low hazard” categories, and least flooded area was classified under “medium hazard” category. The current administration set-up for flood adaptation and mitigation needs to update based on an integrated flood management approach to improve its effectiveness for future flood protection.

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