Abstract The potential impact of large‐scale climate patterns El Niño Southern Oscillation (ENSO), North Atlantic (NAO) and Pacific Decadal (PDO) in modulating precipitation regimes across the upper Medjerda River Basin northern Tunisia is assessed. As case study located Mediterranean region (North Africa), regional (MOAC) Western (WeMO) are also investigated. Six time series observed. Strong correlations identified between ENSO at lag − 2 years. Extreme years reflected as periods severe...

Abstract Water temperature is a key abiotic variable that modulates both water chemistry and aquatic life in rivers streams. For this reason, numerous models have been developed recent years. In paper, k ‐nearest neighbour model (KNN) proposed validated to simulate eventually produce one‐day forecast of mean on the Moisie River, watercourse with an important salmon population eastern Canada. Numerous KNN configurations were compared by selecting different attributes testing weight...

Mediterranean regions are prone to heavy rainfall, flash floods, and erosion issues. Drop size distribution (DSD) is a key element for studying these phenomena through the hydrological variables which can be derived from it (rainfall rates totals, kinetic energy fluxes). This paper proposes five-year (2012–2016) DSD climatology, summarized by scaling parameters concentration, size, shape. The network composed of two longitudinal transects three OTT Parsivel optical disdrometers each, across...

Rain gauge monitoring networks are highly important for precipitation and erosion estimation. In general, measurement accuracy depends on the as well network size design. This paper proposes a method assessing optimal location of new stations within an existing rain network. It takes account prediction rainfall erosivity. A known geostatistical variance-reduction is applied jointly with simulated annealing algorithm objective function minimization. With respect to first objective, kriging...

Abstract The decrease in runoff of the Merguellil basin, Tunisia recorded during decade 1989–1998 led to study several time series derived from daily rainfall. It was found that variability characteristics related rainfall greater than 30 mm are significantly different among successive periods. In addition, probability distributions these rains, at raingauge sites, between period 1976–1989 and prior posterior observation Furthermore, surface covered by rains decreased 1976 1989. also noted...

Northern Tunisia is the rainiest part of country where most water management structures (dams, reservoirs, etc) are located. Its strategic situation with respect to surface resources encourages investigation climate change impacts projected by models. The goal this study first compare observed precipitation model outputs, and then evaluate future changes different area subdivided into four regions: upstream downstream transboundary Medjerda basin, northern coastal basins eastern basins. A...

Knowledge and evaluation of extreme precipitation is important for water resources flood risk management, soil land degradation, other environmental issues. Due to the high potential threat local infrastructure, such as buildings, roads power supplies, heavy can have an social economic impact on society. At present, satellite derived estimates are becoming more readily available. This paper aims investigate use Meteosat Second Generation (MSG) Multi-Sensor Precipitation Estimate (MPE)...

Résumé Le bassin du Merguellil ayant été l'objet de nombreux aménagements conservation des eaux et sols (CES), une étude l'impact ceux-ci par modélisation hydrologique a effectuée. modèle MODCOU qui simule à la fois les écoulements surface souterrains utilisé. Les CES ont pris en compte travers paramétrisation fonction production. calage effectué approche stochastique multicritères sur plusieurs sites d'observations. résultats montrent que l'évapotranspiration réelle constitue plus grande...

Abstract. Based on rainfall intensity-duration-frequency (IDF) curves, fitted in several locations of a given area, robust optimization approach is proposed to identify the best install new rain gauges. The advantage that resulting design solutions yield networks which behave acceptably under hydrological variability. Robust can overcome problem selecting representative events when building process. This paper reports an original based Montana IDF model parameters. latter are assumed be...

The scale invariance of rainfall series in the Tunis area, Tunisia (semi-arid Mediterranean climate) is studied a mono-fractal framework by applying box counting method to four observations, each about 2.5 years length, based on time resolution 5 min.In addition, single daily records for period 1873-2009 was analysed.Three self-similar structures were identified: micro-scale (5 min 2 d) with fractal dimension 0.44, meso-scale (2 d one week) and synoptic-scale (one week eight months)...

Abstract. Much of northern Tunisia regularly experiences extremes drought and flooding, with high rainfall variability. The development reliable accurate seasonal forecasts can provide valuable information to help mitigate some the outcome floods enhance water management monitoring, particularly for agriculture. Whether climate indices oscillations contain be useful hydrological forecasting is worth investigating. Ensemble monthly are carried out using a hybrid neural network model. model...

Abstract. Estimating actual evapotranspiration (AET) in agricultural semi-arid regions is important for crop yield and drought assessment. The Surface Energy Balance System (SEBS) model, a physically based energy balance model using satellite information used to estimate AET at the 10 d scale, with 3 km resolution. bucket bottom hole (BBH) conceptual daily water calibrated equifinality approach run simulating AET. Five watersheds located northern Tunisia areas varying between 56 448 km2 were...

This work aims to evaluate the performance of a hydrological balance model in watershed located northern Tunisia (wadi Sejnane, 378 km2) present climate conditions using input variables provided by four regional models. A modified version (MBBH) lumped and single layer surface BBH (Bucket with Bottom Hole model, which pedo-transfer parameters estimated physiographic characteristics are introduced) is adopted simulate water components. Only two representing respectively retention capacity...

The Standardized Precipitation Index SPI-3, associated with three months of rainfall accumulation, is a drought index for detecting immediate impacts. two-parameter gamma distribution, recommended by the World Meteorological Organization as underlying distribution estimating SPI, has shown limits in semi-arid and arid conditions respect to normality test resulting SPI series. Our purpose was evaluate its relevance Medjerda River Basin (Tunisia), transboundary basin where climate classes are...

(2006). Hydrologie, cheminements de l'eau. Hydrological Sciences Journal: Vol. 51, No. 6, pp. 1210-1211.