Proceedings of the International Association of Hydrological Sciences最新文献

{"title":"Integrated water resources management approach in mitigating the potential impacts of climate change on hydrology in Gurara reservoir catchment, Northwest Nigeria","authors":"I. F. Oseke, G. Anornu, K. Adjei, M. Eduvie","doi":"10.5194/piahs-384-355-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-355-2021","url":null,"abstract":"Abstract. The strategies and actions in the management of African River\u0000Basins in a warming climate environment have been studied. Using the Gurara\u0000Reservoir Catchment in North-West Nigeria as a case study, summations were\u0000proposed using hypothetical climate scenarios considering the Global Climate\u0000Models prediction and linear trend of the data. Four (4) proposed scenarios\u0000of temperature increase (1 % and 2 %) coupled with a decrease in\u0000precipitation of (−5 % and −10 %) were combined and applied for the\u0000study area. The Water Evaluation and Planning Tool was used to model and\u0000evaluates the impact of the earth's rising temperature and declining\u0000rainfall on the hydrology and availability of water by investigating its\u0000resilience to climate change. Modelling results indicate a reduction in\u0000available water within the study area from 4.3 % to 3.5 % compared to\u0000the baseline with no climate change scenario, revealing the current water\u0000management strategy as not sustainable, uncoordinated, and resulting in\u0000overexploitation. The findings could assist in managing future water\u0000resources in the catchment by accentuating the need to put in place\u0000appropriate adaptation measures to foster resilience to climate change.\u0000Practically, it is pertinent to shape more effective policies and\u0000regulations within catchments for effective water resources management in\u0000reducing water shortage as well as achieving downstream water needs and\u0000power benefit in thefuture, while also allowing flexibility in the operation\u0000of a reservoir with the ultimate goal of adapting to climate change.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88288775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erosion fluviale et mutations morphométriques du drainage dans le secteur aval du barrage de Lagdo (Bassin de la Bénoué, Nord-Cameroun)","authors":"Félix Mbele Abbo","doi":"10.5194/piahs-384-113-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-113-2021","url":null,"abstract":"Abstract. La présente étude s'intéresse à la dynamique du drainage de\u0000la Bénoué, par comparaison de deux situations à savoir, celles\u0000d'avant et après implantation d'un barrage à Lagdo (1975–2016). En\u0000effet, jusqu'en 1983, aucun barrage n'existait sur la Bénoué. La\u0000mise en place de cet ouvrage a non seulement modifié l'équilibre\u0000environnemental du bassin versant, mais actionné des dynamiques humaines\u0000et physiques importantes. On y note une modification des modules\u0000hydrologiques, tandis que les processus morphogéniques se sont\u0000accélérés dans le secteur aval, et se révèlent à\u0000travers des glissements fréquents de berges. Il est question dans ce\u0000travail de caractériser l'évolution du drainage par l'entremise des\u0000indicateurs morphométriques et d'en évaluer les impacts ou enjeux.\u0000Pour ce faire, des observations de terrain ont été faites, des\u0000enquêtes/entretiens ont été menés auprès des riverains,\u0000et une base de données géoreférencées a été\u0000constituée sous Qgis 2.6.1 afin de faciliter les analyses diachroniques\u0000du drainage. Il en ressort que les activités morphogéniques ayant\u0000cours dans ce secteur sont de plus en plus actives. Il y a également une\u0000revalorisation positive des caractéristiques actuelles des méandres,\u0000comparativement à la situation de 1975. Les longueurs d'onde et les\u0000amplitudes des méandres n'ont connus que de légères\u0000modifications, tandis que la largeur moyenne des sections est\u0000régulièrement passée de 121,77 m en 1975 à 169,08 m en 2016.\u0000En comparant les différentes sections définis dans le cadre de cette\u0000analyse, on se rend également compte que les largeurs érodées\u0000plein bord s'étendent en moyenne de 1,47 m an−1, alors que les\u0000pertes en terre par section sont de l'ordre de 0,63 ha an−1.\u0000Globalement, les impacts évalués ou ressentis s'avèrent non\u0000négligeables d'où les propositions faites afin de juguler\u0000l'aléa.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78947358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validation of the altimetry-based water levels from Sentinel-3A and B in the Inner Niger Delta","authors":"A. T. Diepkilé, Flavien Egon, F. Blarel, E. Mougin, F. Frappart","doi":"10.5194/piahs-384-31-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-31-2021","url":null,"abstract":"Abstract. The comprehension of water level fluctuations and the\u0000sustainability of the Inner Niger River Delta (IND) is a major concern for\u0000the scientific community, but also for the local population. Located in the\u0000centre of Mali, the heart of the Sahel, the delta is characterised by a\u0000floodable area of more than 32 000 km2 during the rainy season, which\u0000contributes very strongly to the vitality of local ecosystem, and is\u0000consequently classified as a Ramsar site under the international Convention\u0000for Wetlands. In addition, the Delta acts as an environmental and\u0000socio-economic development barometer for the entire sub-region. Nowadays, we\u0000can observe an increasing fragility of the delta due to climate change,\u0000desertification and human activities, and justifies the need for permanent\u0000monitoring. The present study is based on the recent successes of radar\u0000altimetry, originally designed to monitor the dynamics topography of the\u0000ocean, and now very frequently used to retrieve inland water levels, of\u0000lakes, rivers, and wetlands. Previous studies evaluated the performances of\u0000several radar altimetry missions including Low Resolution Mode (LRM)\u0000(Topex-Poseidon, Jason-1/2/3, ERS-2, ENVISAT, and SARAL, and Synthetic\u0000Aperture Radar (SAR) Sentinel-3A missions for water level retrievals over\u00001992–2017. More than 50 times series of water levels were build at the\u0000crossing between water bodies and Sentinel-3A and 3B over 2016–2020.\u0000Twenty-four comparisons between in-situ and altimetry-based time-series of\u0000water levels were achieved over the IND. RMSE generally lower than 0.7 m and\u0000r higher than 0.9 were obtained.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75103636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact de la variabilité climatique et de l'anthropisation sur les écoulements de la Bénoué (nord Cameroun)","authors":"Valentin Brice Ebodé, G. Mahé, Ernest Amoussou","doi":"10.5194/piahs-384-261-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-261-2021","url":null,"abstract":"Abstract. La sécheresse observée en Afrique tropicale vers la\u0000fin des années 1960, a également affecté le bassin de la\u0000Bénoué en Afrique centrale, avec une persistance remarquable qui\u0000s'est répercutée sur les écoulements. Les ruptures à la\u0000baisse ont été mises en évidence dans les séries\u0000hydropluviométriques de ce bassin au pas de temps annuel en 1970–1971\u0000(pluies) et 1971–1972 (débits). Les déficits associés à cette\u0000rupture sont de -2,9 % pour les pluies et -14,2 % pour les débits,\u0000par rapport à la moyenne climatologique (1950–1951 à 2014–2015). La\u0000saison humide a connu des évolutions pratiquement identiques. Cependant,\u0000depuis la décennie 1990, il est observé un relèvement\u0000significatif dans les écoulements moyens annuels de ce cours d'eau, et\u0000cela coïncide avec le retour des pluies. Le maintien de cette hausse au\u0000cours des récentes décennies pourrait être envisagé en\u0000raison de l'accroissement des espaces imperméabilisés dans le\u0000bassin, qui compenseraient le déficit engendré par la rechute des\u0000pluies après la décennie 1990 via une accentuation du\u0000ruissèlement. De plus, depuis la mise en eau du barrage de Lagdo en\u00001983, il est observé non seulement une augmentation de l'ensemble des\u0000gammes de débits minima suivant des taux allant de +57,8 % (minimum\u0000sur 1 jour) à +70,1 % (minimum sur 90 jours), mais aussi un\u0000accroissement général de la variabilité de l'ensemble des\u0000débits extrêmes (minima et maxima). L'augmentation progressive du\u0000stockage en saison de pluies à la retenue de Lagdo, pour fournir\u0000l'électricité et l'eau d'irrigation durant la saison sèche à\u0000une population grandissante, rendent imperceptibles les effets de\u0000l'accroissement des espaces imperméabilisés non seulement sur les\u0000écoulements de la saison humide, mais aussi sur les écoulements\u0000maxima. Au demeurant, l'opérationnalisation du barrage de Lagdo a eu un\u0000impact significatif sur le régime de la Bénoué, se traduisant\u0000essentiellement par le caractère désormais permanent de\u0000l'écoulement tout au long de l'année hydrologique et un important\u0000fléchissement de la crue d'août à octobre.\u0000Abstract. A tendency to drought conditions appeared in tropical Africa from\u0000the end of 1960s, also affect the Benoue watershed in central Africa, with a\u0000remarkable persistence in streamflow. Negative breakpoints are found in the\u0000annual hydroclimatic time series of the Benoue catchment at annual time step\u0000in 1970–1971 for rainfall, and in 1971–1972 for discharges. Compared to the\u0000climatological mean (1950–1951 to 2014–2015), the deficits associated with these\u0000negative breakpoints are approximating −2.9 % for rainfall, and −14.2 % for discharges. The wet season shows similar developments. However,\u0000from the 1990s, there has been a significant increase in the mean annual\u0000discharges of the Benoue River, which coincides with that of the rainfall\u0000during the same decade. The maintenance of this increase over the recent\u0000decades could also be expected in response to an increase in impervious\u0000surface areas (ISA) in the catc","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89876511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studying recent hydroclimatic variability in Madagascar despite deficient measurement networks: use of CHIRPS and GRACE data at the scale of the Mahajunga province","authors":"S. Bigot, D. Dumas, T. Brou, Rivo Ramboarison, S. Razanaka, N. Philippon","doi":"10.5194/piahs-384-43-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-43-2021","url":null,"abstract":"Abstract. Given the lack of in situ hydroclimatic measurements and networks in Madagascar, the GRACE (2003–2016) spatial gravimetry data, combined with other satellite data such as CHIRPS rainfall estimates or fire monitoring using GFED products, make it possible to establish an interannual assessment of certain climatic and environmental covariations at the\u0000northwest scale of the country. The results show a negative trend in\u0000continental rainfall and water content, especially after 2007, but also a\u0000time lag in the linear variations and trends of the Water Equivalent Height\u0000as well as the number of detected fires (variable indirectly measuring the\u0000pressure of deforestation by slash and burn agriculture).\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90661272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecohydrologie urbaine et changement climatique","authors":"P. Breil, A. Faty, Didier Orange","doi":"10.5194/piahs-384-331-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-331-2021","url":null,"abstract":"Abstract. Due to global change, cities of the future will have to\u0000deal with more intense runoff and longer drought sequences, in addition to a\u0000growing urban and peri-urban population. French Mediterranean cities, such\u0000as Toulon, are already densely urbanised and exposed to the effects of\u0000global warming. The adaptation of their infrastructures is problematic.\u0000Cities with high development potential, such as Dakar, offer the opportunity\u0000to imagine other solutions for the management of water resources and its\u0000extremes in the context of global change. In particular, it is a question of\u0000managing the flows of water and substances linked to intense runoff events\u0000according to an ecohydrological logic that makes it possible to reduce\u0000environmental risks and increase social and economic benefits. To do this,\u0000we use a hydrologically-based geomatics model (IRIP) that produces\u0000predictive maps of areas of generation, transfer and accumulation of intense\u0000runoff and associated nutrients. This allows us to target effective\u0000intervention areas to reduce risks and increase water resources, for example\u0000by simulating land use change in appropriate locations and at the same time\u0000stimulating specific biological processes. The fundamental principle of\u0000ecohydrology is to balance energy flows with biological metabolic flows at\u0000the sub-catchment scale. The mapping of intense runoff processes is a first\u0000step illustrated in this article for the cities of Toulon and Dakar. This\u0000first step is part of the Dakar'2030 project, which aims to rethink urban\u0000development and adapt it to climate change.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79987724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999","authors":"Sakaros Bogning, F. Frappart, G. Mahé, A. Paris, Raphael Onguene, F. Blarel, F. Niño, J. Etamé, J. Braun","doi":"10.5194/piahs-384-181-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-181-2021","url":null,"abstract":"Abstract. This paper investigates links between rainfall variability in the\u0000Ogooué River Basin (ORB) and El Niño Southern Oscillation (ENSO) in\u0000the Pacific Ocean. Recent hydroclimatology studies of the ORB and\u0000surrounding areas resulting in contrasting conclusions about links between\u0000rainfall variability and ENSO. Thus, to make the issue clearer, this study\u0000investigates the links between ENSO and rainfall in the ORB over the period\u00001940–1999. The principal component analysis of monthly rainfall in the ORB\u0000was done. The temporal mode of the first component corresponds to the\u0000interannual variations of rainfall on the ORB. Also, the pattern of the\u0000spatial mode of the first component shows that the ORB is a homogeneous\u0000hydroclimatic zone. However, no leading mode is significantly correlated to\u0000the ENSO index. A cross-wavelet analysis of the time series of basin-scale\u0000rainfall and the ENSO index was therefore carried out. The result is a set\u0000of periodogram structures corresponding to some ENSO episodes recorded over\u0000the study period. And wavelet coherence analysis of both time series\u0000confirms that there are significant links between ENSO and rainfall in the\u0000ORB.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83906908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of river network representation in Africa: application of an approach based on digital elevation data and environmental characteristics","authors":"Axel Belemtougri, A. Ducharne, H. Karambiri","doi":"10.5194/piahs-384-19-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-19-2021","url":null,"abstract":"Abstract. In many continental databases representing rivers across Africa, information on rivers characteristics (length, width, intermittent or perennial) is often incomplete, and small streams are largely underrepresented. Fortunately, the use of topographic information from digital elevation models (DEMs) provides an opportunity to have more detailed information on rivers, particularly small streams in broad areas. A common approach to extract streams from DEM is to consider as a stream all DEM cells that drain at least a certain upstream surface, commonly known as the minimum contributing area (Amin). This parameter (Amin) is generally defined uniformly over large areas and this independently of the very variable climate and landscape conditions so that the generated streams have a rather uniform spatial distribution. To address this issue, using a 3′′ (approx. 90 m × 90 m) DEM of Burkina Faso, the relationship between Amin and the observed drainage density (Ddobs) was established with satisfactory performance (r2=0.86). In ongoing work, the functional relationship between the observed drainage densities (Ddobs) and environmental variables (lithology, climate, geology, vegetation cover) should allow for the establishment of the relationships between Amin and the environmental variables. This relationship allows for spatially variable Amin values depending on landscape characteristics. Before extracting river networks in Africa, the next step will be to validate or update these relationships in several countries.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84056407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of Spacio-temporal Evolution of Salt Dispersion on Nokoue Lake","authors":"E. B. J. Zandagba, E. Alamou, E. Obada, A. Chabi, E. I. Biao, A. Afouda","doi":"10.5194/piahs-384-93-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-93-2021","url":null,"abstract":"Abstract. The numerical modeling of spatio-temporal evolution of\u0000lagoon has an important role in predicting the behaviour of these systems.\u0000Knowing the concentration of the pollutant field distribution in time and\u0000space contributes significantly to the prediction of exceptional phenomena.\u0000The purpose of this paper is to simulate the transport and dispersion of\u0000salt at Nokoue Lake. To this end, the 2D hydrodynamic model SMS (Surface\u0000Water Modeling System) has been used. Results showed that in flood period\u0000the freshwater inflows produce a net seaward transport, while in low water\u0000period the tides lead to periodic seaward and landward transport. The\u0000developed numerical model is useful for predicting pollutants transport in\u0000this system, for water quality management of the Nokoue Lake, and therefore,\u0000fight against eutrophication.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89503127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Évolution du régime hydrologique dans le bassin versant du Bouregreg, Maroc","authors":"Rajae El Aoula, G. Mahé, N. Mhammdi, Abdellatif Ezzahouani, I. Kacimi, Kenza Khomsi","doi":"10.5194/piahs-384-163-2021","DOIUrl":"https://doi.org/10.5194/piahs-384-163-2021","url":null,"abstract":"Abstract. Le Bouregreg est le deuxième fleuve du Maroc. Il draine\u0000les eaux du centre du Maroc, du Moyen Atlas à l'Atlantique, qui sont\u0000stockées dans la retenue du barrage Sidi Mohamed Ben Abdellah\u0000créé en 1974 et situé à proximité de Rabat. Sa fonction\u0000exclusive est l'alimentation en eau potable pour les besoins individuels et\u0000industriels de 6 millions d'habitants de la bande littorale allant de\u0000Kénitra à Casablanca. Toutefois, l'exploitation de cette retenue\u0000présente aujourd'hui quelques incertitudes surtout en considérant\u0000l'augmentation de la population, la baisse des volumes précipités\u0000depuis 1979 et le comblement de la retenue par le transport de sédiments\u0000dus à l'érosion des sols. L'objectif de cette étude est de\u0000d'écrire l'évolution des pluies et des débits du bassin versant\u0000du Bouregreg à partir des séries de pluie et débit sur une\u0000période de 36 ans, de 1977 à 2013. Nous avons utiliséì les\u0000indices pluviométrique et hydrométrique, dans le but de\u0000caractériser l'hétérogénéité temporelle de la\u0000variabilité climatologique et dégager les grandes tendances des\u0000séries de données hydroclimatologiques. L'évolution des indices\u0000pluviométriques et hydrométriques met en relief la période\u0000déficitaire qu'a connu le Maroc au début des années 80. En\u0000effet, une baisse générale des pluies est remarquée dans le\u0000bassin versant du Bouregreg depuis 1979, ainsi il existe des relations entre\u0000la variabilité des pluies de certaines régions et l'Oscillation Nord\u0000Atlantique en 1996. Les méthodes statistiques de détection de\u0000ruptures montrent que la période de rupture majeure se trouve durant la\u0000deuxième moitié des années 70 et le début des années 80.\u0000Depuis cette date la baisse de la pluviométrie s'est installée de\u0000manière significative, et une perturbation du régime hydrologique\u0000est observée sur la presque totalité du bassin versant du Bouregreg,\u0000même si quelques années de meilleures pluviométries ont\u0000été observées à la fin des années 2000.\u0000","PeriodicalId":53381,"journal":{"name":"Proceedings of the International Association of Hydrological Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76982470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}