Preprints
https://doi.org/10.5194/hess-2024-106
https://doi.org/10.5194/hess-2024-106
02 May 2024
 | 02 May 2024
Status: this preprint is currently under review for the journal HESS.

Combined impacts of climate change and human activities on blue and green water resources in the high-intensity development watershed

Xuejin Tan, Bingjun Liu, Xuezhi Tan, Zeqin Huang, and Jianyu Fu

Abstract. Sustainable management of blue and green water resources is vital for the stability and sustainability of watershed ecosystems. Although there has been extensive attention to blue water (BW) which is closely related to human beings, the relevance of green water (GW) for ecosystem security is typically disregarded in water resource evaluations. Specifically, there is a scarcity of comprehensive study on the detection and attribution of variation of blue and green water in the Dongjiang River Basin (DRB), an important source for regional water supply in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) of China. Here we assess the variations of BW and GW scarcity, quantify the impacts of climate change and land use change on BW and GW in DRB using a multi-water-flux calibrated Soil and Water Assessment Tool (SWAT). Results show that BW and green water storage (GWS) in DRB increased slowly with a rate of 0.14 and 0.015 mm a-1, respectively, while green water flow (GWF) decreased significantly at a rate of -0.21 mm a-1. The degree of BW and GW scarcity in DRB is low, and the per capita water resources in more than 80 % of DRB exceed 1700 m3 capita-1 a-1. Attribution results show that 88.0 %, 88.5 %, and 39.4 % of changes in BW, GWF, and GWS results from climate change, respectively. Both climate change and land use change have decrease BW, while climate change (land use change) decrease (increase) GWF in DRB. These findings can guide to optimize the allocation of blue and green water resources between upper reach and lower reach areas in DRB and further improve the understanding of blue and green water evolution patterns in humid regions.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Xuejin Tan, Bingjun Liu, Xuezhi Tan, Zeqin Huang, and Jianyu Fu

Status: open (until 27 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Xuejin Tan, Bingjun Liu, Xuezhi Tan, Zeqin Huang, and Jianyu Fu
Xuejin Tan, Bingjun Liu, Xuezhi Tan, Zeqin Huang, and Jianyu Fu

Viewed

Total article views: 225 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
178 38 9 225 18 7 9
  • HTML: 178
  • PDF: 38
  • XML: 9
  • Total: 225
  • Supplement: 18
  • BibTeX: 7
  • EndNote: 9
Views and downloads (calculated since 02 May 2024)
Cumulative views and downloads (calculated since 02 May 2024)

Viewed (geographical distribution)

Total article views: 211 (including HTML, PDF, and XML) Thereof 211 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 24 May 2024
Download
Short summary
We assess the spatiotemporal changes in blue and green water scarcity in a anthropogenic highly-impacted watershed and their association with climate change and land use change, using a multi-water-flux validated SWAT model. Observed streamflow, evapotranspiration, and soil moisture are integrated to model calibration, and validation. Results show that both climate change and land use change have decrease blue water and g green water flow, while land use change increase green water flow.