Hydroclimatology of the Kaduna River Basin  

作　　者：Temi E. Ologunorisa Olufemi S. Durowoju Ademola Akinbobola Temi E. Ologunorisa;Olufemi S. Durowoju;Ademola Akinbobola(Department of Meteorology and Climate Science, The Federal University of Technology, Akure, Nigeria;Department of Geography, Osun State University, Osogbo, Nigeria)

机构地区：[1]Department of Meteorology and Climate Science, The Federal University of Technology, Akure, Nigeria [2]Department of Geography, Osun State University, Osogbo, Nigeria

出　　处：《American Journal of Climate Change》2021年第3期353-369,共17页美国气候变化期刊（英文）

摘　　要：This study examined the hydroclimatology of the Kaduna River Basin (KRB) in northern Nigeria. In achieving this, monthly data on temperature (T) and rainfall (P) were sourced from ten hydrometeorological stations across the basin from 1990 to 2018. DrinC (Drought Indices Calculator) software was deployed to calculate Potential Evapotranspiration (PET) adopting Thornthwaite approach. Water Balance (WB) model was used further to estimate other WB components <em>i.e.</em> soil moisture (SM), actual evapotranspiration (ET_a), Water surplus (S) and Runoff (R). WB components are used to examine the temporal and spatial variability of the KRB for hydrological years (1990-2018). KRB was divided into two sub-basins (Lower and Upper KRB). The WB analyses indicated the peak of R generally occurs during the wet season (<em>i.e.</em> April through October) most especially at the Upper KRB. The study further reveals that the runoff efficiencies imply that <44% of annual P results in R at the upper KRB while <27% of annual P results in R at the lower KRB. The study shows that SM utilization occurs mostly towards the end of the year and at the early months (<em>i.e.</em> November through March) across the basin while the majority of S is generated during wet season months, particularly from April through October when ~95% of S occurs on average with the peak S in August. The results of this study provide a baseline understanding of the hydroclimatology of the KRB which can be used as a starting point for further analyses, especially for water resources management.This study examined the hydroclimatology of the Kaduna River Basin (KRB) in northern Nigeria. In achieving this, monthly data on temperature (T) and rainfall (P) were sourced from ten hydrometeorological stations across the basin from 1990 to 2018. DrinC (Drought Indices Calculator) software was deployed to calculate Potential Evapotranspiration (PET) adopting Thornthwaite approach. Water Balance (WB) model was used further to estimate other WB components <em>i.e.</em> soil moisture (SM), actual evapotranspiration (ET_a), Water surplus (S) and Runoff (R). WB components are used to examine the temporal and spatial variability of the KRB for hydrological years (1990-2018). KRB was divided into two sub-basins (Lower and Upper KRB). The WB analyses indicated the peak of R generally occurs during the wet season (<em>i.e.</em> April through October) most especially at the Upper KRB. The study further reveals that the runoff efficiencies imply that <44% of annual P results in R at the upper KRB while <27% of annual P results in R at the lower KRB. The study shows that SM utilization occurs mostly towards the end of the year and at the early months (<em>i.e.</em> November through March) across the basin while the majority of S is generated during wet season months, particularly from April through October when ~95% of S occurs on average with the peak S in August. The results of this study provide a baseline understanding of the hydroclimatology of the KRB which can be used as a starting point for further analyses, especially for water resources management.

关 键 词：HYDROCLIMATOLOGY Kaduna River Basin Water Balance NIGERIA 

分 类 号：F42[经济管理—产业经济]