Modeling suspended sediment transport and assessing the impacts of climate change in a karstic Mediterranean watershed

Nerantzaki, Sofia D.; Giannakis, Giorgos; Efstathiou, Dionissis; Nikolaidis, Nikolaos P.; Sibetheros, Ioannis A.; Karatzas, George P.; Zacharias, Ierotheos

doi:10.1016/j.scitotenv.2015.07.092

Cited by 72 publications

(28 citation statements)

References 50 publications

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“…The Tafna was characterized by very irregular flow with frequent dry summers, indicating very limited permanent reserves [67]. This study confirmed those results, affirming the good performance of SWAT in Mediterranean Karstic semi-arid watersheds [68].…”

Section: Discussionsupporting

confidence: 82%

“…In a study of the Medjerda River basin in Tunisia, the authors found a range of Nash-Sutcliffe efficiencies between 0.31 and 0.65, and range of coefficient R 2 between 0.62 and 0.8 [40]. In another study on the semi-arid river of the Hamadan-Bahar watershed in Iran, the authors found a Nash-Sutcliffe efficiency range of between 0.33 and 0.77, and a range of coefficient R 2 of between 0.38 and 0.83 [68]. The calibrated SWAT model can be used successfully to predict the volume inflow to the dams and facilitate the storage and release of water [44].…”

Section: Discussionmentioning

confidence: 91%

“…Large quantities are retained mainly during flood events, representing 87%-95% of the annual sediment export. In the Koiliaris river in Greece, flood events account for 63%-70% of the annual sediment export in a wet or dry year [68]. Between 37% and 98% of sediment settles in North African reservoirs [76].…”

Section: Discussionmentioning

confidence: 99%

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Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Zettam

Taleb

Sauvage

et al. 2017

Water

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Sediment deposits in North African catchments contribute to around 2%-5% of the yearly loss in the water storage capacity of dams. Despite its semi-arid climate, the Tafna River plays an important role in Algeria's water self-sufficiency. There is continuous pressure on the Tafna's dams to respond to the demand for water. The Soil and Water Assessment Tool (SWAT) was used to evaluate the contribution of different compartments in the basin to surface water and the dams' impact on water and sediment storage and its flux to the sea in order to develop reservoir management. The hydrological modelling fitted well with the observed data (Nash varying between 0.42 and 0.75 and R 2 varying between 0.25 and 0.84). A large proportion of the surface water came from surface runoff (59%) and lateral flow (40%), while the contribution of groundwater was insignificant (1%). SWAT was used to predict sediments in all the gauging stations. Tafna River carries an average annual quantity of 2942 t·yr −1 to the Mediterranean Sea. A large amount of water was stored in reservoirs (49%), which affected the irrigated agricultural zone downstream of the basin. As the dams contain a large amount of sediment, in excess of 27,000 t·yr −1 (90% of the sediment transported by Tafna), storage of sediment reduces the lifetime of reservoirs.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 91%

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Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Zettam

Taleb

Sauvage

et al. 2017

Water

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“…The Keramianos ephemeral tributary that drains the homonymous sub-catchment of 32 km 2 includes a rain and stage gauge. Overgrazing in the Keramianos sub-catchment (Figure 1b) leaves the top soil vulnerable to surface runoff [40]. As a result of poor vegetation cover and steep slopes, the Keramianos tributary is often responsible for Koiliaris River flash flooding, which in the past has caused several damages in the downstream area of the Koiliaris watershed [41].…”

Section: Case Study and Datamentioning

confidence: 99%

Soil Moisture Content Estimation Based on Sentinel-1 and Auxiliary Earth Observation Products. A Hydrological Approach

Alexakis

Mexis

Vozinaki

et al. 2017

Sensors

107

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A methodology for elaborating multi-temporal Sentinel-1 and Landsat 8 satellite images for estimating topsoil Soil Moisture Content (SMC) to support hydrological simulation studies is proposed. After pre-processing the remote sensing data, backscattering coefficient, Normalized Difference Vegetation Index (NDVI), thermal infrared temperature and incidence angle parameters are assessed for their potential to infer ground measurements of SMC, collected at the top 5 cm. A non-linear approach using Artificial Neural Networks (ANNs) is tested. The methodology is applied in Western Crete, Greece, where a SMC gauge network was deployed during 2015. The performance of the proposed algorithm is evaluated using leave-one-out cross validation and sensitivity analysis. ANNs prove to be the most efficient in SMC estimation yielding R2 values between 0.7 and 0.9. The proposed methodology is used to support a hydrological simulation with the HEC-HMS model, applied at the Keramianos basin which is ungauged for SMC. Results and model sensitivity highlight the contribution of combining Sentinel-1 SAR and Landsat 8 images for improving SMC estimates and supporting hydrological studies.

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“…A strong influence of dispersal, as it could be inferred by the SNCM, would have overcome the effect of weak selection and have resulted in homogenized microbial communities (Evans et al 2017, Leibold et al 2004. The milder dispersal rates that have been estimated by the Stegen et al (2015) framework and acted bidirectionally (dispersal limitation and homogenizing dispersal; Table 1) appear to provide more realistic estimations considering the observed spatial patterns of microbial communities as well as the geomorphology of the watershed (Nerantzaki et al 2015). The high inter-annual turnover of microbial communities provides some evidence that the sources of dispersal extend beyond the boundaries of watershed.…”

Section: Temporal Shifts In the Relative Contribution Of Assembly Promentioning

confidence: 98%

Neutral processes and high inter-annual turnover shape the assembly of soil bacterial communities in a Mediterranean watershed

Tsiknia

Fodelianakis

et al. 2019

Preprint

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There is a renewed interest in recent years on the ecological processes (stochastic vs selective) driving the assembly of microbial communities. Such information could potentially improve our understanding on ecosystem functioning and resilience to disturbances, ecosystem response to environmental shifts, and adoption of sustainable soil management practices. Herein, employing a suite of existing methodologies, we show that stochastic processes have an important role on the assembly of soil bacterial communities at a Mediterranean watershed. Moreover, we document that the relative contribution of assembly processes varies over the years. The observed intensification of stochastic processes was accompanied by a decrease in the contribution of variable selection in favor of homogeneous selection and dispersal and this trend was only marginally affected by land use (natural vs agricultural lands) or soil depth. Our study also revealed a high interannual turnover of soil microbial communities that was likely stimulated by the weak environmental selection and the prevailing environmental conditions (drying-wetting cycles) in Mediterranean landscapes, implying potential impacts on ecosystem functioning and our ability to predict soil response to environmental shifts. Using nitrogen mineralization rate (NMR) as a representative function we document highly variable NMR over the sampling years, land uses and soil depths and lack of significant associations with the monitored environmental variables and individual taxa. In summary, our study provides novel insights on the organization and functioning of microbial communities at Mediterranean ecosystems and sets directions towards a more advanced understanding of the relationships among environmental factors, microbial community structure, and ecosystem functioning that could contribute to sustainable management of these severely degraded ecosystems.

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Modeling suspended sediment transport and assessing the impacts of climate change in a karstic Mediterranean watershed

Cited by 72 publications

References 50 publications

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Soil Moisture Content Estimation Based on Sentinel-1 and Auxiliary Earth Observation Products. A Hydrological Approach

Neutral processes and high inter-annual turnover shape the assembly of soil bacterial communities in a Mediterranean watershed

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