Trends in drought patterns of Turkey

Karabörk, M. Çağatay

doi:10.1139/s06-034

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…The statistical analysis of trends in climate and hydrologic variables uses the Mann–Kendall test (Lins and Slack, 1999; Zhang et al , 2001; Huth and Pokorna, 2004). To gain more confidence in our results, a categorically different and less common technique, Sen's t ‐test, was also employed (Karabörk, 2007). Both tests are non‐parametric approaches and do not require any assumptions about the distribution of the variables.…”

Section: Methodsmentioning

confidence: 99%

Trends in rainfall and runoff in the Blue Nile Basin: 1964–2003

Tesemma

Mohamed

Steenhuis

2010

Hydrological Processes

138

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Most Nile water originates in Ethiopia but there is no agreement on how land degradation or climate change affects the future flow in downstream countries. The objective of this paper is to improve season flow. The difference in response was likely due to weir construction in the nineties at the Lake Tana outlet that affected significantly the upper Blue Nile discharge but only affected less than 10% of the discharge at the Sudan border. The rainfall runoff model reproduced the observed trends, assuming that an additional ten percent of the hillsides were eroded in the 40 year time span and generated overland flow instead of interflow and base flow. Models concerning future trends in the Nile cannot assume that the landscape runoff processes will remain static.

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Section: Methodsmentioning

confidence: 99%

Trends in rainfall and runoff in the Blue Nile Basin: 1964–2003

Tesemma

Mohamed

Steenhuis

2010

Hydrological Processes

138

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“…The Mann–Kendall statistic tests the null hypothesis H 0 which states that the time‐series of hydrological variables (streamflow and precipitation) ( x 1 , x 2 , …, x n ) are a sample of an independent and random distribution. The two‐sided test with hypothesis of H 1 as an alternative hypothesis states that the distribution of x k and x j are not identical for all, k , j ⩽ n with k ≠ j (Salmi 2002; Yue et al , 2002; Karabork, 2007). The Mann–Kendall test statistic S is calculated using the equation below: The values of S and Var ( S ) are used to compute the test statistic Z as follows: …”

Section: Methodsmentioning

confidence: 99%

“…Positive values of Z indicate an upward trend and negative values indicate a downward trend. Detailed descriptions of the test can be found in various studies (Gerstengarbe and Werner, 1999; Jiang and Zhang, 2004; Karabork, 2007).…”

Section: Methodsmentioning

confidence: 99%

Exploring the impact of climate and land use changes on streamflow trends in a monsoon catchment

Adnan

Atkinson

2011

Intl Journal of Climatology

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Flooding appears to be increasing in Kelantan, Malaysia, in terms of frequency as well as magnitude. This is likely to be due to changes in precipitation, but may also be contributed to by land use change. The Mann-Kendall non-parametric method was used to test for trends in streamflow and precipitation at the 90% significance level. Several significant trends in streamflow were found for the upstream (River Galas) and downstream (River Kelantan) sub-catchments for all variables (annual, seasonal and monthly time-series). In particular, streamflow increased in all seasons in the upstream sub-catchment, but increased in the wet season and decreased in the dry season downstream. Several trends were also observed for precipitation. Precipitation trends were increasing in the wet season and decreasing in the dry season for both upstream and downstream sub-catchments. Analysis of land use change revealed that most changes occurred through conversion of forest to agricultural land (i.e. rubber and oil palm), predominantly in the upstream sub-catchment. The analysis suggests a clear association between streamflow change and precipitation change, but also reveals that land use change may be an important contributing factor, particularly in the upstream sub-catchment.

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“…Positive value indicates an upward trend while negative value a downward trend. More descriptions of this method can be found in many researches [47][48][49]. In this paper, trend analysis of climatic variables and runoff in the Dongjiang basin were conducted with the Mann-Kendall test based on over 50 years of climatic and hydrological data.…”

Section: Mann-kendallmentioning

confidence: 99%

Effect of Land Use and Climate Change on Runoff in the Dongjiang Basin of South China

Lin

Chen

2013

Mathematical Problems in Engineering

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Variability and availability of water resources under changing environment in a regional scale have been hot topics in recent years, due to the vulnerability of water resources associated with social and economic development. In this paper, four subbasins in the Dongjiang basin with a significant land use change were selected as case study. Runoffs of the four subbasins were simulated using the SCS monthly model to identify the quantitative impacts of land use and climate change. The results showed that (1), in the Dongjiang basin, temperature increased significantly, evaporation and sunlight decreased strongly, while precipitation showed a nonsignificant increase; (2) since the 1980s, land uses in the Dongjiang basin have experienced a significant change with a prominent increase in urban areas, a moderate increase in farmlands, and a great decrease in forest areas; (3) the SCS monthly model performed well in the four subbasins giving that the more significant land use change in each subbasin, the more runoff change correspondingly; (4) overall, runoff change was contributed half and half by climate change and human activities, respectively, in all the subbasins, in which about 20%~30% change was contributed by land use change.

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Trends in drought patterns of Turkey

Cited by 14 publications

References 23 publications

Trends in rainfall and runoff in the Blue Nile Basin: 1964–2003

Trends in rainfall and runoff in the Blue Nile Basin: 1964–2003

Exploring the impact of climate and land use changes on streamflow trends in a monsoon catchment

Effect of Land Use and Climate Change on Runoff in the Dongjiang Basin of South China

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