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Table 7 Extrapolation of Weibull parameters at the respective turbine hub heights

From: Wind energy potential and cost estimation of wind energy conversion systems (WECSs) for electricity generation in the eight selected locations of Tigray region (Ethiopia)

Location   z k c (m/s)
10 m 30 m 50 m 80 m 10 m 30 m 50 m 80 m
Adigrat January 0.35 4.1300 4.5720 4.8114 5.0550 1.1401 1.6746 2.0025 2.3605
February 3.5615 3.9426 4.1491 4.3592 1.4026 2.0603 2.4636 2.9041
March 2.9835 3.3028 3.4758 3.6517 1.3912 2.0436 2.4436 2.8806
April 3.5612 3.9423 4.1488 4.3588 1.7425 2.5596 3.0606 3.6079
May 3.1403 3.4764 3.6585 3.8437 1.3764 2.0218 2.4176 2.8498
June 3.9878 4.4146 4.6458 4.8810 1.9112 2.8073 3.3569 3.9571
July 2.8632 3.1697 3.3357 3.5045 1.6994 2.4963 2.9849 3.5187
August 3.0251 3.3488 3.5242 3.7026 1.1139 1.6363 1.9566 2.3064
September 3.5785 3.9615 4.1689 4.3800 0.9104 1.3374 1.5992 1.8851
October 3.7279 4.1269 4.3430 4.5629 1.0386 1.5256 1.8242 2.1504
November 2.3553 2.6074 2.7440 2.8829 1.1015 1.6181 1.9348 2.2808
December 3.6272 4.0154 4.2257 4.4396 0.9955 1.4622 1.7485 2.0611
Adwa January 0.35 2.7517 3.0462 3.2057 3.3680 0.7872 1.1563 1.3827 1.6299
February 3.4350 3.8027 4.0018 4.2044 1.1568 1.6992 2.0319 2.3952
March 3.1619 3.5003 3.6836 3.8701 1.2415 1.8237 2.1807 2.5707
April 2.4296 2.6896 2.8305 2.9738 1.8115 2.6609 3.1819 3.7508
May 2.5990 2.8772 3.0279 3.1812 1.1078 1.6272 1.9458 2.2937
June 1.8647 2.0643 2.1724 2.2824 1.7154 2.5198 3.0131 3.5518
July 3.7454 4.1463 4.3634 4.5843 1.4670 2.1548 2.5767 3.0374
August 2.7143 3.0048 3.1621 3.3222 1.3353 1.9614 2.3453 2.7647
September 2.7699 3.0663 3.2269 3.3903 0.8850 1.2999 1.5544 1.8323
October 2.0210 2.2373 2.3545 2.4737 0.9276 1.3625 1.6292 1.9205
November 2.4296 2.6896 2.8305 2.9738 1.8115 2.6609 3.1819 3.7508
December 4.6900 5.1919 5.4638 5.7404 0.7492 1.1005 1.3159 1.5512
Atsbi January 0.28 4.3232 4.7859 5.0366 5.2915 2.4276 3.3019 3.8096 4.3454
February 4.2743 4.7317 4.9795 5.2316 2.6316 3.5794 4.1298 4.7107
March 4.4089 4.8808 5.1364 5.3964 2.9278 3.9823 4.5947 5.2409
April 4.0003 4.4284 4.6603 4.8962 3.6379 4.9481 5.7090 6.5120
May 4.0134 4.4430 4.6756 4.9123 2.8710 3.9051 4.5055 5.1393
June 4.3283 4.7915 5.0424 5.2977 3.3241 4.5213 5.2166 5.9503
July 4.2745 4.7320 4.9798 5.2319 3.0253 4.1150 4.7477 5.4155
August 4.4089 4.8808 5.1364 5.3964 2.9278 3.9823 4.5947 5.2409
September 4.2337 4.6868 4.9322 5.1819 2.6216 3.5658 4.1141 4.6927
October 3.7738 4.1777 4.3965 4.6191 2.7442 3.7325 4.3065 4.9122
November 4.1554 4.6001 4.8410 5.0861 2.5065 3.4093 3.9335 4.4868
December 4.6900 5.1919 5.4638 5.7404 2.5617 3.4843 4.0201 4.5856
Chercher January 0.28 3.9986 4.4266 4.6584 4.8942 2.6787 3.6435 4.2038 4.7950
February 4.1398 4.5829 4.8229 5.0670 3.0713 4.1775 4.8198 5.4978
March 4.0535 4.4873 4.7223 4.9614 3.2356 4.4010 5.0777 5.7919
April 4.1105 4.5504 4.7887 5.0311 3.4717 4.7222 5.4483 6.2146
May 2.9666 3.2841 3.4561 3.6310 2.7462 3.7353 4.3097 4.9158
June 4.3182 4.7804 5.0307 5.2854 3.1095 4.2295 4.8798 5.5662
July 4.1130 4.5532 4.7917 5.0342 3.4147 4.6446 5.3588 6.1125
August 3.4328 3.8002 3.9992 4.2017 2.8800 3.9173 4.5197 5.1554
September 2.3286 2.5778 2.7128 2.8501 1.8439 2.5080 2.8937 3.3007
October 3.8455 4.2570 4.4800 4.7068 2.0912 2.8443 3.2817 3.7433
November 4.3051 4.7658 5.0154 5.2693 2.6974 3.6690 4.2331 4.8285
December 3.8484 4.2603 4.4834 4.7104 2.7268 3.7089 4.2792 4.8811
Maychew January 0.34 4.0945 4.5327 4.7701 5.0115 1.2894 1.8733 2.2286 2.6147
February 4.2019 4.6516 4.8952 5.1430 1.2604 1.8312 2.1785 2.5560
March 4.0472 4.4803 4.7149 4.9536 1.4485 2.1044 2.5036 2.9374
April 4.1644 4.6101 4.8515 5.0971 1.5273 2.2189 2.6398 3.0972
May 3.4913 3.8649 4.0673 4.2732 1.2293 1.7860 2.1247 2.4929
June 3.3639 3.7239 3.9190 4.1174 2.0437 2.9692 3.5324 4.1445
July 3.1193 3.4531 3.6340 3.8179 3.0385 4.4145 5.2518 6.1618
August 2.5274 2.7979 2.9444 3.0934 2.2501 3.2691 3.8891 4.5630
September 2.3188 2.5670 2.7014 2.8381 1.3064 1.8980 2.2580 2.6492
October 4.3457 4.8108 5.0627 5.3190 0.9688 1.4075 1.6744 1.9646
November 4.2322 4.6851 4.9305 5.1801 0.9800 1.4238 1.6938 1.9873
December 4.5303 5.0151 5.2778 5.5449 1.1569 1.6808 1.9996 2.3461
Mekele January 0.26 3.7277 4.1266 4.3427 4.5626 5.1047 6.7923 7.7571 8.7654
February 3.7012 4.0974 4.3119 4.5302 5.2762 7.0205 8.0177 9.0599
March 3.5996 3.9849 4.1936 4.4059 5.6160 7.4727 8.5341 9.6434
April 3.9446 4.3668 4.5955 4.8281 5.5802 7.4251 8.4798 9.5820
May 3.4722 3.8438 4.0451 4.2499 3.8991 5.1882 5.9252 6.6953
June 3.7329 4.1324 4.3488 4.5689 2.4934 3.3178 3.7890 4.2815
July 3.7629 4.1657 4.3838 4.6057 2.3174 3.0835 3.5215 3.9793
August 3.6524 4.0433 4.2551 4.4705 2.1088 2.8060 3.2045 3.6210
September 3.6375 4.0268 4.2377 4.4522 1.9027 2.5318 2.8914 3.2672
October 4.0671 4.5024 4.7382 4.9781 3.5171 4.6798 5.3446 6.0393
November 3.9021 4.3197 4.5460 4.7761 4.0150 5.3425 6.1013 6.8943
December 3.7464 4.1473 4.3645 4.5855 4.5729 6.0847 6.9490 7.8522
Senkata January 0.29 4.4550 4.9318 5.1900 5.4528 2.1089 2.9001 3.3632 3.8543
February 4.1077 4.5473 4.7854 5.0277 2.8510 3.9207 4.5468 5.2107
March 4.0203 4.4506 4.6837 4.9208 2.5936 3.5667 4.1362 4.7402
April 3.8406 4.2516 4.4743 4.7008 3.4536 4.7494 5.5078 6.3121
May 2.9440 3.2591 3.4298 3.6034 2.7434 3.7727 4.3751 5.0140
June 3.3286 3.6848 3.8778 4.0741 2.5110 3.4531 4.0045 4.5893
July 3.7171 4.1149 4.3304 4.5496 1.6743 2.3026 2.6702 3.0601
August 3.1940 3.5358 3.7210 3.9093 1.5891 2.1854 2.5343 2.9044
September 2.8560 3.1617 3.3273 3.4957 2.1577 2.9672 3.4410 3.9435
October 3.3604 3.7200 3.9148 4.1130 2.8124 3.8676 4.4852 5.1402
November 3.5392 3.9180 4.1232 4.3319 2.3465 3.2269 3.7421 4.2886
December 3.4475 3.8165 4.0164 4.2197 2.2843 3.1413 3.6429 4.1748
Shire January 0.36 3.1719 3.5114 3.6953 3.8824 0.9589 1.4242 1.7117 2.0273
February 4.0354 4.4673 4.7012 4.9392 1.2927 1.9198 2.3074 2.7328
March 3.6173 4.0044 4.2142 4.4275 1.3881 2.0615 2.4777 2.9344
April 3.3588 3.7183 3.9130 4.1111 1.7018 2.5274 3.0377 3.5977
May 3.0845 3.4146 3.5934 3.7753 1.0460 1.5535 1.8671 2.2113
June 3.3780 3.7395 3.9354 4.1346 1.3949 2.0717 2.4899 2.9490
July 3.3203 3.6757 3.8682 4.0640 1.0412 1.5463 1.8585 2.2011
August 3.5002 3.8748 4.0777 4.2842 1.0393 1.5436 1.8552 2.1972
September 3.3089 3.6630 3.8549 4.0500 0.8521 1.2654 1.5209 1.8013
October 2.9207 3.2333 3.4027 3.5749 0.7472 1.1097 1.3337 1.5796
November 3.3588 3.7183 3.9130 4.1111 1.7018 2.5274 3.0377 3.5977
December 4.6900 5.1919 5.4638 5.7404 0.7865 1.1681 1.4039 1.6627