English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The study area, the municipality of Droum, is located in the high watershed of Korama. It has several aquifers, including the aquifer of recent sands with high potential in groundwater. This aquifer is in great demand for the supply of drinking water, animal watering and for expanding irrigation. However, this shallow aquifer remains very sensitive to the climate variability that has affected the region, like the rest of the Sahel, from 1970 to the present day. The main objective of this study is to characterize the climate parameters and quantify the recharge of this aquifer during the period of 1921-2016. The methodology adopted is the characterization of the various climatic parameters and the estimation of the water balance from several technics (annual pluviometric index, Hanning’s low-pass filter and statistical tests for detecting discontinuities such as it is: Petitt’s test, Lee and Heghinian’s bayesian procedure, Hubert’s segmentation procedure, Thornthwaite and Penman’s methods for water balance calculate) that have led to severalresults. Thus, the analysis of the rainfall series shows the alternation of the three phases : the wet phase from 1921 to 1964, the dry phase from 1965 to 1997 and the normal phase from 1998 to 2016, and a significant discontinuities reflecting the decrease in rainfall starting at 1965 and not very significant highlighting the return of these from 1998. Moreover, the hydrological balance highlights the behavior of the water table for these different climatic phases. It is observed, however, that the recharge of this layer in the dry period is relatively low compared to the wet period. This probably comes from indirect recharge because there has been an intensification of runoff. From 1998, the observed trend of precipitation return has resulted in a slight increase in the infiltrated water slide compared to the dry period. However, it is too weak compared to that of the wet period and the increased demands of this resource for different uses. La zone d’etude, la Commune de Droum, est situee dans le haut bassin versant de la Korama. Celle-ci dispose de plusieurs aquiferes, dont l’aquifere phreatique des sables recents ayant des hautes potentialites en eau souterraine. Cet aquifere est tres sollicite pour l’approvisionnement en eau de boisson, l’abreuvage des animaux et pour l’irrigation en pleine expansion. Cependant, cet aquifere peu profond reste tres sensible a la variabilite climatique ayant affecte la region, comme le reste du sahel, de 1970 a nos jours. L’objectif principal de cette etude est de caracteriser les parametres climatiques puis de quantifier la recharge de cette nappe pendant la periode de 1921-2016. La methodologie adoptee est la caracterisation des differents parametres climatiques et l’estimation du bilan hydrique a partir de plusieurs techniques (l’indice pluviometrique annuel, le filtre passe-bas de Hanning et les tests statistiques de detection de rupture tels que le Test de Petitt, procedure bayesienne de Lee et Heghinian, segmentation d’Hubert, methodes Thornthwaite et Penman pour le calcul du bilan) ayant permis d’aboutir a plusieurs resultats. Ainsi, l’analyse de la serie pluviometrique montre l’alternance de trois phases: la phase humide de 1921 a 1964, la phase seche de 1965 a 1997 et la phase normale de 1998 a 2016, et une rupture significative traduisant la baisse de precipitations a partir de 1965 et peu significative mettant en evidence le retour de celles-ci a partir de 1998. Par ailleurs, le bilan hydrologique met en evidence le comportement de la nappe pour ces differentes phases climatiques. On observe, cependant que la recharge de cette nappe en periode seche est relativement faible par rapport a la periode humide. Celle-ci provienne probablement de la recharge indirecte car il y a eu une intensification de ruissellement. A partir de 1998, la tendance observee du retour des precipitations a eu comme consequence, une legere augmentation de la lame d’eau infiltree par rapport a la periode seche. Toutefois, celle-ci est trop faible quand on le compare a celle de la periode humide et aux demandes accrues de cette ressource pour les differents usages.

european scientific journal

Caractérisations Hydroclimatiques et Estimation du Taux de Recharge de la Nappe Libre du Haut Bassin Versant de la Korama, Commune de Droum/Région de Zinder/Niger