This document discusses the worldwide virtual water network using kriskograms to visualize its evolution from 1990 to 2010 through yearly flow data. It presents plots for the biggest 64 countries in terms of total virtual water flow and details acknowledgments for data preparation. The research aims to analyze the social, economic, and environmental implications of the global virtual-water network.

1. The Worldwide Network of Virtual Water with
Kriskogram
Rodolfo Metulini1
1
Scuola Superiore S.Anna Pisa - Institute of Economics
Abstract
In this document some Kriskograms are used as a tool to visually analyze the
evolution over time of the worldwide Virtual Water network (yearly flows).
Plots are reported for the years 1990, 1995, 2000, 2005 and 2010.
Virtual Water; Network; Kriskograms
Acknowledgment
I would like to thanks Irina Mirkina (Lund University) to kindly shared with me her
codes. Virtual Water data are prepared by Stefania Tamea and Francesco Laio (Politec-
nico Torino) for the project “The global virtual-water network: social, economic, and
environmental implications” (FIRB - RBFR12BA3Y)
References
• Bergh, A., Mirkina, I., & Nilsson, T. (2015). Pushed by Poverty or by Institutions?
Determinants of Global Migration Flows (No. 1077).
• Sander, N., Abel, G. J., Bauer, R., & Schmidt, J. (2014). Visualising migration flow
data with circular plots (No. 2/2014). Vienna Institute of Demography Working
Papers.
• Gu, Z., Gu, L., Eils, R., Schlesner, M., Brors, B. (2014). circlize implements and
enhances circular visualization in R. Bioinformatics, btu393.
1

2. Figure 1: 1990 VW flow. The biggest 64 countries in terms of total VW flow (total
inflows + total outflows) are reported. Reported are the links >= 180* mean(VW)
2

3. Figure 2: 1995 VW flow. The biggest 64 countries in terms of total VW flow (total
inflows + total outflows) are reported. Reported are the links >= 180* mean(VW)
3

4. Figure 3: 2000 VW flow. The biggest 64 countries in terms of total VW flow (total
inflows + total outflows) are reported. Reported are the links >= 180* mean(VW)
4

5. Figure 4: 2005 VW flow. The biggest 64 countries in terms of total VW flow (total
inflows + total outflows) are reported. Reported are the links >= 170* mean(VW)
5

6. Figure 5: 2010 VW flow. The biggest 64 countries in terms of total VW flow (total
inflows + total outflows) are reported. Reported are the links >= 170* mean(VW)
6