Assessment of wind shelter conditions of an open water storage reservoir using wind shelter index

Figures & data

Figure 1. The locations of the study areas: (a) the location of the study area in Iran and Khuzestan province, (b) elevations overlooking the lake (m), and (c) the locations of Hosseinieh and Safi Abad synoptic stations in relation to Dez Dam Lake.

Figure 2. Schematic view of the wind shelter situation, with 3 points (1, 2, and 3) based on a linear profile from a hypothetical topography (Winstral et al. 2002, Farokhzadeh et al. 2014).

Figure 3. Raster maps of Sx values for an effective length of 1000 m for (a) Jun, (b) Jul, (c) Aug, and (d) Sep.

Figure 4. June wind roses at 2 synoptic stations: (a) Hosseinieh and (b) Safi Abad, from 2005 to 2016.

Figure 5. Impact bounds of wind direction with azimuth 262.5 to 322.5º (13 directions), for one of the grid points.

Figure 6. The average of differences of Sx in each consecutive 2 lengths for (a) Jun, (b) Jul, (c) Aug, and (d) Sep.

Table 1. Average values of water level and wind shelter index.

Month	Average water level (m)	Average Sx (degrees)	Average Sx value for points located on the lake margin (degrees)	Average Sx value for points located in the central parts of the lake (degrees)
Jun	345.5	0.050	0.123	0.007
Jul	343.5	0.053	0.129	0.007
Aug	338	0.059	0.141	0.008
Sep	331	0.071	0.168	0.010

Table 2. Percent reduction in water surface height and increase in wind index in each month compared to the previous month.

Variables	Jul vs. Jun	Aug vs. Jul	Sep vs. Aug
Water level decrease (%)	13.79	34.48	51.72
Average Sx increase (%)	20.42	47.56	73.5

Figure 7. Clustered area of Lake Dez dam on the basis of cluster analysis of Sx using Ward method in (a) Jun, (b) Jul, (c) Aug, and (d) Sep.

Table 3. Clustering statistical parameters using the Ward method.

Month	Factors	Cluster 1	Cluster 2	Cluster 3	Cluster 4	Cluster 5
Jun	Sx variations (%) in each cluster	0–0.049	0.049–0.127	0.127–0.319	0.32–0.535	0.537–1.109
	Area of each cluster vs. total area of the lake (%)	75.6	12.8	8.2	3.0	0.4
	Average Sx in each cluster (degrees)	0.009	0.081	0.2	0.407	0.682
Jul	Sx variations (%) in each cluster	0–0.039	0.039–0.163	0.163–0.411	0.412–0.737	0.74–1.118
	Area of each cluster vs. total area of the lake (%)	70.8	19.2	7.8	2.2	0.01
	Average Sx in each cluster (degrees)	0.039	0.163	0.411	0.737	1.118
Aug	Sx variations (%) in each cluster	0–0.03	0.03–0.116	0.117–0.216	0.216–0.399	0.4–1.133
	Area of each cluster vs. total area of the lake (%)	62.3	21	8.02	5.5	3.2
	Average Sx in each cluster (degrees)	0.006	0.063	0.159	0.292	0.55
Sep	Sx variations (%) in each cluster	0–0.034	0.034–0.115	0.115–0.256	0.257–0.571	0.573–1.155
	Area of each cluster vs. total area of the lake (%)	55.5	21.9	13.2	8.1	1.4
	Average Sx in each cluster (degrees)	0.008	0.066	0.174	0.376	0.709
Average area of each cluster vs. total area of the lake (%)		66.1	18.7	9.3	4.7	1.3
Average Sx in each cluster during the studied period (degrees)		0.016	0.093	0.236	0.453	0.765

Winstral A, Elder K, Davis RE. 2002. Spatial snow modeling of wind-redistributed snow using terrain based parameters. J Hydrometeor. 3(5):524–538. doi:10.1175/1525-7541(2002)003 < 0524:SSMOWR>2.0.CO;2..

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Farokhzadeh S, Sharifi MR, Moradi S, Akhond Ali AM. 2014. Wind shelter index’s effective distance determination in non-snowy watershed basins. J Adv in Environ Biol. 8(5):1431–1441.

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