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Sectorial water use trends in the urbanizing Pearl River Delta, China.

Yao M, Werners SE, Hutjes RW, Kabat P, Huang H - PLoS ONE (2015)

Bottom Line: Assessing and managing water use is crucial for supporting sustainable river basin management and regional development.The first consistent and comprehensive assessment of sectorial water use in the Pearl River Delta (PRD) is presented by analysing homogenized annual water use data from 2000 to 2010 in relation to socio economic statistics for the same period.Although scarce and uncertain input data and model limitations lead to a high level of uncertainty, the presented conceptualization of water use is useful in exploring the underlying driving forces of water use trends.

View Article: PubMed Central - PubMed

Affiliation: Earth System Science, Wageningen University, Wageningen, the Netherlands.

ABSTRACT
Assessing and managing water use is crucial for supporting sustainable river basin management and regional development. The first consistent and comprehensive assessment of sectorial water use in the Pearl River Delta (PRD) is presented by analysing homogenized annual water use data from 2000 to 2010 in relation to socio economic statistics for the same period. An abstraction of water use, using the concept of water use intensity, and based on equations inspired by those used in global water resource models, is developed to explore the driving forces underlying water use changes in domestic, industrial and agricultural sectors. We do this at both the level of the region as a whole, as well as for the nine cities that constitute the PRD separately. We find that, despite strong population and economic growth, the PRD managed to stabilize its absolute water use by significant improvements in industrial water use intensities, and early stabilisation of domestic water use intensities. Results reveal large internal differentiation of sectorial water use among the cities in this region, with industrial water use intensity varying from -80 to +95% and domestic water use intensity by +/- 30% compared to the PRD average. In general, per capita water use is highest in the cities that industrialised first. Yet, all cities except Guangzhou are expected to approach a saturation value of per capita water use much below what is suggested in recent global studies. Therefore, existing global assessments probably have overestimated future domestic water use in developing countries. Although scarce and uncertain input data and model limitations lead to a high level of uncertainty, the presented conceptualization of water use is useful in exploring the underlying driving forces of water use trends.

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Water use intensity in the PRD.Values shown are in the units of litres/person-day for DOMU and DOMR, m3/104 Yuan IVA for IND, m3/ha for IRR, and m3/person-year for the Total water use intensity (Total) respectively.
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pone.0115039.g004: Water use intensity in the PRD.Values shown are in the units of litres/person-day for DOMU and DOMR, m3/104 Yuan IVA for IND, m3/ha for IRR, and m3/person-year for the Total water use intensity (Total) respectively.

Mentions: As shown in Fig. 4, industrial water use intensity in the PRD is decreasing, while water use intensities remained rather stable in the rural, domestic and irrigation sectors. Urban domestic and the overall per capita water use intensity share a similar trend that peaked in 2004 and gradually decreased thereafter. On average, people consumed 288 litres of water per day for domestic uses. The industry sector needed on average about 160 m3 of water to produce 10,000 Yuan of IVA. Crops required 11,500 m3 per ha for irrigation. In total an average of about 500 m3 of water was used per capita in the PRD during the studied period.


Sectorial water use trends in the urbanizing Pearl River Delta, China.

Yao M, Werners SE, Hutjes RW, Kabat P, Huang H - PLoS ONE (2015)

Water use intensity in the PRD.Values shown are in the units of litres/person-day for DOMU and DOMR, m3/104 Yuan IVA for IND, m3/ha for IRR, and m3/person-year for the Total water use intensity (Total) respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4340799&req=5

pone.0115039.g004: Water use intensity in the PRD.Values shown are in the units of litres/person-day for DOMU and DOMR, m3/104 Yuan IVA for IND, m3/ha for IRR, and m3/person-year for the Total water use intensity (Total) respectively.
Mentions: As shown in Fig. 4, industrial water use intensity in the PRD is decreasing, while water use intensities remained rather stable in the rural, domestic and irrigation sectors. Urban domestic and the overall per capita water use intensity share a similar trend that peaked in 2004 and gradually decreased thereafter. On average, people consumed 288 litres of water per day for domestic uses. The industry sector needed on average about 160 m3 of water to produce 10,000 Yuan of IVA. Crops required 11,500 m3 per ha for irrigation. In total an average of about 500 m3 of water was used per capita in the PRD during the studied period.

Bottom Line: Assessing and managing water use is crucial for supporting sustainable river basin management and regional development.The first consistent and comprehensive assessment of sectorial water use in the Pearl River Delta (PRD) is presented by analysing homogenized annual water use data from 2000 to 2010 in relation to socio economic statistics for the same period.Although scarce and uncertain input data and model limitations lead to a high level of uncertainty, the presented conceptualization of water use is useful in exploring the underlying driving forces of water use trends.

View Article: PubMed Central - PubMed

Affiliation: Earth System Science, Wageningen University, Wageningen, the Netherlands.

ABSTRACT
Assessing and managing water use is crucial for supporting sustainable river basin management and regional development. The first consistent and comprehensive assessment of sectorial water use in the Pearl River Delta (PRD) is presented by analysing homogenized annual water use data from 2000 to 2010 in relation to socio economic statistics for the same period. An abstraction of water use, using the concept of water use intensity, and based on equations inspired by those used in global water resource models, is developed to explore the driving forces underlying water use changes in domestic, industrial and agricultural sectors. We do this at both the level of the region as a whole, as well as for the nine cities that constitute the PRD separately. We find that, despite strong population and economic growth, the PRD managed to stabilize its absolute water use by significant improvements in industrial water use intensities, and early stabilisation of domestic water use intensities. Results reveal large internal differentiation of sectorial water use among the cities in this region, with industrial water use intensity varying from -80 to +95% and domestic water use intensity by +/- 30% compared to the PRD average. In general, per capita water use is highest in the cities that industrialised first. Yet, all cities except Guangzhou are expected to approach a saturation value of per capita water use much below what is suggested in recent global studies. Therefore, existing global assessments probably have overestimated future domestic water use in developing countries. Although scarce and uncertain input data and model limitations lead to a high level of uncertainty, the presented conceptualization of water use is useful in exploring the underlying driving forces of water use trends.

Show MeSH