干旱区生态环境知识资源中心(Arid): INCREASE IN WATER-SCARCITY RISK IN A BRAZILIAN DRY-REGION RESERVOIR

Arid

DOI	10.1590/1983-21252020v33n418rc
	INCREASE IN WATER-SCARCITY RISK IN A BRAZILIAN DRY-REGION RESERVOIR
	Lopez Gil, Margarita Maria; De Araujo, Jose Carlos; Gico Lima Montenegro, Suzana Maria; De Morais Sobreira Valenca, Juliana Maria
通讯作者	Gil, MML
来源期刊	REVISTA CAATINGA
ISSN	0100-316X
EISSN	1983-2125
出版年	2020
卷号	33 期号:4 页码:1025-1036
英文摘要	This study assesses the extent to which silting increases water-scarcity risk, considering the temporal reduction of water availability and increased demand using land use and water-demand scenarios at the transition of Caatinga and Cerrado biomes of the Bocaina reservoir watershed (10(2)hm(3)), in the Brazilian dry region. Methodological steps were: reservoir silting measured in-situ 20 years after dam construction; climate variables computed with the aid of a conventional station (2005-2014); soil erodibility assessed using 16 soil samples; and topography and land cover estimated based on 21 years of Landsat imagery. Three land use scenarios were generated (invariability, degradation and preservation) with the climate scenario derived from the semi-arid rainfall temporal variability; whereas two water-demand scenarios (invariability and higher efficiency) were a function of the efficiency of the irrigation systems. Water availability was calculated using the volume-yield elasticity (VYELAS) Model. The field results (1985-2015) showed a gross erosion rate of 13.5 Mg.ha(-1).yr(-1) in the basin. The annual sediment yield (1.7 Mg.ha(-1)) and the decadal reservoir silting (1.0%) were below regional average due to the low sediment delivery ratio (12.6%) in the area. Scenario projections (2040) suggest water demand may double if irrigation methods do not improve, whereas siltation may cause water availability to decrease up to 10% in the period. In this case, the water-supply reliability will be below the recommended standard value (90%), regardless of the land use scenario. Nevertheless, simultaneous soil preservation and improved irrigation efficiency can reduce the decadal water-scarcity risk from 82% (worst scenario) to 17%.
英文关键词	Caatinga biome Cerrado biome Water management Water demand Silting
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000587761900018
WOS关键词	RIVER-BASIN ; SOIL LOSS ; AVAILABILITY ; EROSION ; YIELD
WOS类目	Agronomy
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327418
作者单位	[Lopez Gil, Margarita Maria] Univ Estadual Piaui, Ctr Technol & Urbanism, Teresina, PI, Brazil; [De Araujo, Jose Carlos] Univ Fed Ceara, Dept Agr Engn, Fortaleza, Ceara, Brazil; [Gico Lima Montenegro, Suzana Maria] Univ Fed Pernambuco, Dept Civil Engn, Recife, PE, Brazil; [De Morais Sobreira Valenca, Juliana Maria] Inst Fed Educ Ciencia & Tecnol Piaui, Picos, PI, Brazil
推荐引用方式 GB/T 7714	Lopez Gil, Margarita Maria,De Araujo, Jose Carlos,Gico Lima Montenegro, Suzana Maria,et al. INCREASE IN WATER-SCARCITY RISK IN A BRAZILIAN DRY-REGION RESERVOIR[J],2020,33(4):1025-1036.
APA	Lopez Gil, Margarita Maria,De Araujo, Jose Carlos,Gico Lima Montenegro, Suzana Maria,&De Morais Sobreira Valenca, Juliana Maria.(2020).INCREASE IN WATER-SCARCITY RISK IN A BRAZILIAN DRY-REGION RESERVOIR.REVISTA CAATINGA,33(4),1025-1036.
MLA	Lopez Gil, Margarita Maria,et al."INCREASE IN WATER-SCARCITY RISK IN A BRAZILIAN DRY-REGION RESERVOIR".REVISTA CAATINGA 33.4(2020):1025-1036.