Trend analysis and forecasting of the Gökırmak River streamflow (Turkey)

Figures & Tables

Streamflow	Mean	SD	CV	CS	Maximum value	Minimum value	Range
Annual	28.48	3.43	0.45	202.46	49.90	10.46	39.44
Spring	64.89	8.16	0.47	415.31	111.77	25.37	86.40
Summer	21.27	4.17	0.73	78.39	50.71	3.64	47.06
Autumn	8.70	0.89	0.38	69.84	13.90	1.38	12.52
Winter	19.07	2.53	0.50	105.58	34.73	5.00	29.73

Streamflow	Skewness	SE_skewness	Z_skewness	Kurtosis	SE_kurtosis	Z_kurtosis	Kolmogorov–Smirnov^*		Shapiro–Wilk
Streamflow	Skewness	SE_skewness	Z_skewness	Kurtosis	SE_kurtosis	Z_kurtosis	Statistics	p-value	Statistics	p-value
Annual	0.04	0.597	0.067	−1.35	1.154	−0.001	0.175	0.200^*	0.935	0.200^*
Spring	0.18	0.597	0.302	−1.53	1.154	−0.001	0.139	0.200^*	0.921	0.200^*
Summer	0.42	0.597	0.704	−1.01	1.154	−0.001	0.182	0.200^*	0.924	0.200^*
Autumn	−0.58	0.597	−0.972	0.55	1.154	0.000	0.129	0.200^*	0.853	0.042
Winter	0.21	0.597	0.352	−1.12	1.154	−0.001	0.137	0.200^*	0.956	0.200^*

Period	Streamflow	Kendall’s tau	p	Trend	Spearman’s rho	p	Trend
Annual	Annual	−0.055	0.784	▼	−0.055	0.852	▼
Seasonal	Spring	−0.209	0.298	▼	−0.297	0.303	▼
	Summer	0.143	0.477	▲	0.240	0.409	▲
	Autumn	−0.297	0.169	▼	−0.437	0.118	▼
	Winter	−0.099	0.622	▼	−0.108	0.714	▼
Monthly	January	−0.209	0.298	▼	−0.262	0.366	▼
	February	−0.165	0.412	▼	−0.204	0.483	▼
	March	−0.055	0.784	▼	−0.099	0.737	▼
	April	−0.209	0.298	▼	−0.288	0.318	▼
	May	−0.143	0.477	▼	−0.143	0.626	▼
	June	0.209	0.298	▲	0.244	0.401	▲
	July	0.011	0.956	▲	0.156	0.594	▲
	August	−0.231	0.250	▼	−0.288	0.318	▼
	September	−0.209	0.298	▼	−0.341	0.233	▼
	October	−0.231	0.250	▼	−0.349	0.221	▼
	November	−0.209	0.298	▼	−0.226	0.436	▼
	December	0.033	0.870	▲	−0.011	0.970	▼