scholarly journals Tidal flood area mapping in the face of climate change scenarios: case study in a tropical estuary in the Brazilian semi-arid region

2021 ◽  
Vol 21 (11) ◽  
pp. 3353-3366
Author(s):  
Paulo Victor N. Araújo ◽  
Venerando E. Amaro ◽  
Leonlene S. Aguiar ◽  
Caio C. Lima ◽  
Alexandre B. Lopes
Keyword(s):  
Climate Change ◽  
Flood Risk ◽  
Arid Region ◽  
Risk Mapping ◽  
Climate Change Scenarios ◽  
Management Actions ◽  
The Face ◽  
Semi Arid Region ◽  
Semi Arid

Abstract. Previous studies on tidal flood mapping are mostly through continental- and/or global-scale approaches. Moreover, the few works on local-scale perception are concentrated in Europe, Asia, and North America. Here, we present a case study approaching a tidal flood risk mapping application in the face of climate change scenarios in a region with a strong environmental and social appeal. The study site is an estuarine cut in the Brazilian semi-arid region, covering part of two state conservation units, which has been suffering severe consequences from tidal flooding in recent years. In this case study, we used high-geodetic-precision data (lidar DEM), together with robust tidal return period statistics and data from current sea level rise scenarios. We found that approximately 327.60 km2 of the estuary is under tidal flood risk and in need of mitigation measures. This case study can serve as a basis for future management actions, as well as a model for applying risk mapping in other coastal areas.

scholarly journals Tidal flood area mapping fronts the climate change scenarios: case study in a tropical estuary of Brazilian semiarid

2020 ◽  
Author(s):  
Paulo Victor N. Araújo ◽  
Venerando E. Amaro ◽  
Leonlene S. Aguiar ◽  
Caio C. Lima ◽  
Alexandre B. Lopes
Keyword(s):  
Climate Change ◽  
High Risk ◽  
Global Scale ◽  
Risk Mapping ◽  
Mitigation Measures ◽  
Climate Change Scenarios ◽  
Conservation Units ◽  
Precision Data ◽  
Management Actions

Abstract. Previous studies on tidal flood mapping are mostly with continental and/or global scale approaches. Besides, the few works on local scale perception are concentrated in Europe, Asia, and North America. Here we present a case study approaching a flood risk mapping methodology against climate change scenarios in a region with a strong environmental and social appeal. The study site is an estuarine cut in the Brazilian semi-arid, covering part of two state conservation units, which has been in recent years suffering severe consequences from flooding by tides. In this case study, high geodetic precision data (LiDAR DEM), together with robust tidal return period statistics and data from current sea level rise scenarios were used. We found that approximately 118.26 km2 of the estuary understudy is at high risk, extremely high risk and urgently in need of mitigation measures. This case study can serve as a basis for future management actions as well as a model for applying risk mapping in other coastal areas.

scholarly journals Impacts of the Fomento Program on Family Farmers in the Brazilian Semi-Arid and its relevance to climate change: a case study in the region of Sub medio São Francisco

2020 ◽  
Vol 11 (1) ◽  
pp. 211-225
Author(s):  
Patrícia Mesquita ◽  
Ricardo Theophilo Folhes ◽  
Louise Cavalcante ◽  
Luciana Vieira de Novais Rodrigues ◽  
Beatriz Abreu Santos ◽  
...  
Keyword(s):  
Climate Change ◽  
Arid Region ◽  
Technical Assistance ◽  
Climate Projections ◽  
Family Farmers ◽  
The Social ◽  
The Face ◽  
Semi Arid Region ◽  
Food And Nutritional Security ◽  
Semi Arid

For some years, Brazil established itself as a leader in strategies of strategies and programs aimed at reducing the social vulnerability of the most vulnerable populations. In this context, the Program for the Promotion of Rural Productive Activities (Fomento Program), created in 2011, had as one of the main objectives to stimulate the generation of work and income, and promote food and nutritional security for rural, indigenous, traditional and settled populations of agrarian reform. In the Northeast, and more specifically in the Semi-arid region, the relevance of this Program stands out even more concerning climate projections, which indicates that such areas will suffer from more extreme drought in the face of climate change, affecting populations dependent on climate-sensitive activities. Therefore, given the diversity of impacts of the Fomento Program reported in the literature, this article sought to present results on the perception of the Program's impacts from 24 family farmers, interviewed through qualitative research in four municipalities in the state of Bahia in 2017. In addition to the socio-productive aspects, the research sought to understand the Program's impacts in the context of climate change. The results point to a positive perception mainly related to changes in production and technical assistance based on the Paradigm of Co-existence with the Semi-arid Region.

scholarly journals Effect of Temperature on Sowing Dates of Wheat under Arid and Semi-Arid Climatic Regions and Impact Quantification of Climate Change through Mechanistic Modeling with Evidence from Field

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 927
Author(s):  
Jamshad Hussain ◽  
Tasneem Khaliq ◽  
Muhammad Habib ur Rahman ◽  
Asmat Ullah ◽  
Ishfaq Ahmed ◽  
...  
Keyword(s):  
Climate Change ◽  
Grain Yield ◽  
Arid Region ◽  
Field Experiments ◽  
Climatic Conditions ◽  
Seasonal Temperature ◽  
Sowing Dates ◽  
Rcp 8.5 ◽  
Semi Arid Region ◽  
Semi Arid

Rising temperature from climate change is the most threatening factor worldwide for crop production. Sustainable wheat production is a challenge due to climate change and variability, which is ultimately a serious threat to food security in Pakistan. A series of field experiments were conducted during seasons 2013–2014 and 2014–2015 in the semi-arid (Faisalabad) and arid (Layyah) regions of Punjab-Pakistan. Three spring wheat genotypes were evaluated under eleven sowing dates from 16 October to 16 March, with an interval of 14–16 days in the two regions. Data for the model calibration and evaluation were collected from field experiments following the standard procedures and protocols. The grain yield under future climate scenarios was simulated by using a well-calibrated CERES-wheat model included in DSSAT v4.7. Future (2051–2100) and baseline (1980–2015) climatic data were simulated using 29 global circulation models (GCMs) under representative concentration pathway (RCP) 8.5. These GCMs were distributed among five quadrants of climatic conditions (Hot/Wet, Hot/Dry, Cool/Dry, Cool/Wet, and Middle) by a stretched distribution approach based on temperature and rainfall change. A maximum of ten GCMs predicted the chances of Middle climatic conditions during the second half of the century (2051–2100). The average temperature during the wheat season in a semi-arid region and arid region would increase by 3.52 °C and 3.84 °C, respectively, under Middle climatic conditions using the RCP 8.5 scenario during the second half-century. The simulated grain yield was reduced by 23.5% in the semi-arid region and 35.45% in the arid region under Middle climatic conditions (scenario). Mean seasonal temperature (MST) of sowing dates ranged from 16 to 27.3 °C, while the mean temperature from the heading to maturity (MTHM) stage was varying between 12.9 to 30.4 °C. Coefficients of determination (R2) between wheat morphology parameters and temperature were highly significant, with a range of 0.84–0.96. Impacts of temperature on wheat sown on 15 March were found to be as severe as to exterminate the crop before heading. The spikes and spikelets were not formed under a mean seasonal temperature higher than 25.5 °C. In a nutshell, elevated temperature (3–4 °C) till the end-century can reduce grain yield by about 30% in semi-arid and arid regions of Pakistan. These findings are crucial for growers and especially for policymakers to decide on sustainable wheat production for food security in the region.

scholarly journals Modeling Insights into Precipitation Deuterium Excess as an Indicator of Raindrop Evaporation in Lanzhou, China

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 193
Author(s):  
Fenli Chen ◽  
Mingjun Zhang ◽  
Athanassios A. Argiriou ◽  
Shengjie Wang ◽  
Qian Ma ◽  
...  
Keyword(s):  
Arid Region ◽  
Quantitative Methods ◽  
Isotope Composition ◽  
Sampling Site ◽  
Western China ◽  
Cloud Base ◽  
Deuterium Excess ◽  
Semi Arid Region ◽  
Semi Arid

The deuterium excess in precipitation is an effective indicator to assess the existence of sub-cloud evaporation of raindrops. Based on the synchronous measurements of stable isotopes of hydrogen and oxygen (δ2H and δ18O) in precipitation for several sites in Lanzhou, western China, spanning for approximately four years, the variations of deuterium excess between the ground and the cloud base are evaluated by using a one-box Stewart model. The deuterium excess difference below the cloud base during summer (−17.82‰ in Anning, −11.76‰ in Yuzhong, −21.18‰ in Gaolan and −12.41‰ in Yongdeng) is greater than that in other seasons, and difference in winter is weak due to the low temperature. The variations of deuterium excess in precipitation due to below-cloud evaporation are examined for each sampling site and year. The results are useful to understand the modification of raindrop isotope composition below the cloud base at a city scale, and the quantitative methods provide a case study for a semi-arid region at the monsoon margin.

scholarly journals Households’ Adaptation to Climate Change Hazards in Semi-Arid Region of Mopani, South Africa

2021 ◽  
Author(s):  
Musa Yusuf Jimoh ◽  
Peter Bikam ◽  
Hector Chikoore ◽  
James Chakwizira ◽  
Emaculate Ingwani
Keyword(s):  
Climate Change ◽  
South Africa ◽  
Climate Change Adaptation ◽  
Urban Areas ◽  
Arid Region ◽  
Adaptive Systems ◽  
Adaptation To Climate Change ◽  
Temperature And Precipitation ◽  
Semi Arid Region ◽  
Semi Arid

New climate change realities are no longer a doubtful phenomenon, but realities to adapt and live with. Its cogent impacts and implications’ dispositions pervade all sectors and geographic scales, making no sector or geographic area immune, nor any human endeavor spared from the associated adversities. The consequences of this emerging climate order are already manifesting, with narratives written beyond the alterations in temperature and precipitation, particularly in urban areas of semi-arid region of South Africa. The need to better understand and respond to the new climate change realities is particularly acute in this region. Thus, this chapter highlights the concept of adaptation as a fundamental component of managing climate change vulnerability, through identifying and providing insight in respect of some available climate change adaptation models and how these models fit within the premises and programmes of sustainable adaptation in semi-arid region with gaps identification. The efforts of governments within the global context are examined with households’ individual adaptation strategies to climate change hazards in Mopani District. The factors hindering the success of sustainable urban climate change adaptation strategic framework and urban households’ adaptive systems are also subjects of debate and constitute the concluding remarks to the chapter.

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