Comment on hess-2022-185 DOI Creative Commons
Elias Nkiaka

Опубликована: Авг. 9, 2022

Abstract. Achieving water security in poorly gauged basins is critically hindered by a lack of situ river discharge data to assess past, current, and future evolution resources. To overcome this challenge, there has been shift toward the use freely available satellite reanalysis products. However, due inherent bias uncertainty, these secondary sources require careful evaluation ascertain their performance before being applied basins. The objectives study were evaluate evapotranspiration estimates from eight gridded resources reanalysis (WRR), six satellite-based evapotranspiration (ET) products, ET derived complimentary relationship (CR–ET) across located Central–West Africa. Results highlight strengths weaknesses different WRR simulating dynamics Likewise, products also show some strength monthly ET. Our results further revealed that models strongly influenced model structure, input data, spatial resolution. Considering all hydrological criteria, FLDAS-Noah, Lisflood, AWRAL, Terra among best performing while for ET estimates, Terra, GLEAM3.5a and 3.5b, PMLV2 outperformed rest Given plethora available, it imperative representative identify can be each region. choice particular product will depend on application user requirements. Taking together, suggest are useful source assessing

Язык: Английский

Understanding Links Between Water Scarcity and Violent Conflicts in the Sahel and Lake Chad Basin Using the Water Footprint Concept DOI Creative Commons
Elias Nkiaka, Robert G. Bryant, Zongho Kom

и другие.

Earth s Future, Год журнала: 2024, Номер 12(2)

Опубликована: Фев. 1, 2024

Abstract Whilst there are several empirical studies linking water scarcity and violent conflicts, existing quantitative use mostly climate environmental variables even though such have been shown to not be strong predictors of conflicts by some studies. The aim this study was the footprint concept Falkenmark index identify hotspots at sub‐national scale understand links between in Sahel Lake Chad Basin over a period two decades (2000–2021). We achieve developing five metrics monthly timescale using runoff, soil moisture, potential evapotranspiration, consumption demographic data. developed show high levels across area during dry, pre‐monsoon post‐monsoon seasons. Analyses further reveal green (GWS) (soil moisture deficit) low scores (water stress) seasons, all reported conflict locations. This suggest that is an indirect link GWS, conflicts. Results from may used enhance management, mitigate, prevent likewise methodology adopted address other regions.

Язык: Английский

Процитировано

6
Exploring the socioeconomic determinants of water security in developing regions DOI Creative Commons
Elias Nkiaka

Water Policy, Год журнала: 2022, Номер 24(4), С. 608 - 625

Опубликована: Апрель 1, 2022

Abstract The objectives of this study are two fold: first, to develop a composite water security metric assess at national scale, and second, explore the determinants same scale in three developing regions – Africa, Asia-Pacific Latin America Caribbean (LAC). index (WSI) was developed using biophysical (water availability, climate risk ecosystem vitality) socioeconomic accessibility integrated resources management) variables. Five independent variables (governance, gross domestic product (GDP) per capita, percentage urban population, official development assistance for sanitation services (ODA-WSS) female primary school completion rate) were used security. Results show that >90% countries Africa water-insecure, whereas most LAC water-secure except Haiti, Guatemala Nicaragua. Statistical analyses GDP rate governance key This provides empirical evidence on link between further strong correlation ODA-WSS region with higher capita than low capita. suggests increasing may enhance regions.

Язык: Английский

Процитировано

15
Changes in climate, vegetation cover and vegetation composition affect runoff generation in the Gulf of Guinea Basin DOI Creative Commons
Elias Nkiaka, Gloria C. Okafor

Hydrological Processes, Год журнала: 2024, Номер 38(3)

Опубликована: Март 1, 2024

Abstract Although considerable effort has been deployed to understand the impact of climate variability and vegetation change on runoff in major basins across Africa, such studies are scarce Gulf Guinea Basin (GGB). This study combines Budyko framework elasticity concept along with geospatial data fill this research gap 44 nested sub‐basins GGB. Annual rainfall from 1982 2021 show significant decreasing increasing trends northern southern parts GGB, respectively. potential evapotranspiration (PET) also shows higher magnitudes observed Changing variables corroborates shift arid wetter conditions north south, From 2000 2020 cover estimated using enhanced index (EVI) all including those experiencing a decline annual rainfall. Vegetation composition measured continuous fields (VCFs) an increase tree canopy (TC), short marginal changes bare ground (BG). Elasticity coefficients that 10% PET may lead 33% 24% runoff, On other hand, EVI 4% while TC, SV BG reduce by 3% 2%, Even though marginal, decomposing into different parameters VCFs hydrological effects which is one novelties be used for implementing nature‐based solutions. The demonstrates freely available together analytical methods promising approach understanding hydrology data‐scarce regions.

Язык: Английский

Процитировано

3
The water balance concept modification for the development of web-based rain gauge calibrators DOI

Mahmudi,

Sensus Wijonarko, Tatik Maftukhah

и другие.

AIP conference proceedings, Год журнала: 2025, Номер 3280, С. 020018 - 020018

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Factors influencing management of Black Sigatoka disease of banana and plantain in the South-West Region of Cameroon DOI
Ayat Ullah,

Sylvanus Agbor Tabi,

Miroslava Bavorová

и другие.

Crop Protection, Год журнала: 2025, Номер unknown, С. 107251 - 107251

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Trend analysis of climatic parameters using geographical information systems: a case study of Sivas Province (1982–2021) DOI Creative Commons
Zinnur YILMAZ, Anıl Can Birdal

The European Physical Journal Plus, Год журнала: 2025, Номер 140(5)

Опубликована: Май 20, 2025

Язык: Английский

Процитировано

0
Evaluating the accuracy of gridded water resources reanalysis and evapotranspiration products for assessing water security in poorly gauged basins DOI Creative Commons
Elias Nkiaka, Robert G. Bryant, Joshua Ntajal

и другие.

Hydrology and earth system sciences, Год журнала: 2022, Номер 26(22), С. 5899 - 5916

Опубликована: Ноя. 25, 2022

Abstract. Achieving water security in poorly gauged basins is critically hindered by a lack of situ river discharge data to assess past, current, and future evolution resources. To overcome this challenge, there has been shift toward the use freely available satellite reanalysis products. However, due inherent bias uncertainty, these secondary sources require careful evaluation ascertain their performance before being applied basins. The objectives study were evaluate evapotranspiration estimates from eight gridded resources (WRR), six satellite-based (ET) products, ET derived complimentary relationship (CR–ET) across located Central–West Africa. Results highlight strengths weaknesses different WRR simulating dynamics Likewise, products also show some strength monthly ET. Our results further revealed that models strongly influenced model structure, input data, spatial resolution. Considering all hydrological criteria, FLDAS-Noah, Lisflood, AWRAL, Terra among best performing while for estimates, Terra, GLEAM3.5a 3.5b, PMLV2 outperformed rest Given plethora available, it imperative representative identify can be each region. choice particular product will depend on application user requirements. Taking together, suggest are useful source assessing

Язык: Английский

Процитировано

10
Assessing water security and footprint in hypersaline Lake Urmia DOI Creative Commons
Parvaneh Sobhani, Hassan Esmaeilzadeh, Azade Deljouei

и другие.

Ecological Indicators, Год журнала: 2023, Номер 155, С. 110955 - 110955

Опубликована: Сен. 15, 2023

The quantitative assessment of water security including its distribution helps plan and manage adequate amounts quality to sustain livelihoods. This research introduces a hydrological modeling framework designed evaluate the spatial temporal fluctuations blue green water, aiming quantify status Lake Urmia in Iran. lake, recognized as second largest hypersaline lake globally, has experienced significant decline storage recent years. model, based on consumption population size was used investigate footprint while quantifying changes availability water. As results demonstrate, monthly annual coefficient variation for (41.1 % 27.6%, respectively) greater than (32.3% 21.7%, respectively), hence flow showed more homogeneous among different sub-basins. At same time, differs between various components footprint. Agricultural use requires most this basin, with scarcity 0.27. vulnerability value total indicates lower risk crisis under low-flow conditions. In addition, freshwater provision indicator each sub-basin varies middle (0.64) (0.80) parts. Thus, these parts, can be consumed less negative impact environment. conclusion, environmental situation clearly decreased over last decade which urgent management action (e.g., changing irrigation pattern) mitigate an crisis. offers precise quantifiable references related resources security, enhance targeted within study area. Our provides basis inform similar watersheds across globe.

Язык: Английский

Процитировано

5
Assessing the Role of Irrigation as an Adaptive Measure to Climate Change Induced Water Insecurity: Case Study of the Market Gardening Sector in Parts of the Northwest and West Regions of Cameroon DOI Creative Commons
Nyong Princely Awazi

Frontiers in Water, Год журнала: 2022, Номер 4

Опубликована: Июнь 16, 2022

Climate change induced extreme weather events are having major repercussions on availability and accessibility to water resources especially for farmers across the globe. This is more so small-scale in developing world who largely depend rain-fed agriculture. The market gardening sector particular known its high dependence suitable conditions adequate productivity. However, recent years, garden crop cultivation has been severely threatened by climate such as prolong dry spells, scanty erratic rainfall, rising temperatures, sunshine storms. study was undertaken understand role of irrigation an adaptive measure insecurity, with focus parts west northwest regions Cameroon. Data were collected through a survey 260 gardeners involved different practices geared toward countering insecurity problems change. Findings indicated that dryness, temperatures. A majority surveyed reported existence which led failure many instances placing them financial difficulties seriously hampering their livelihood. Market types including sprinkler, drip, furrow, manual some taking no practice. main factors influencing gardeners' practice face scarcity/insecurity household income, age gardeners, educational level, farm size, number plots, proximity source water, gender, requirement crop, support from government NGOs, extension services, access credit, membership farming group common initiative (CIG). therefore forcing indulge all year round bid improve productivity reduce recurrent failures. On basis these findings, use sustainable methods order conserve recommended this will go long way phase out problem Policy makers need craft implement favorable policies encourage adopt scarcity/insecurity.

Язык: Английский

Процитировано

7
Multidimensional risk meteorological-soil joint drought (MR-MSJD) in China’s crop planting DOI

Qingzhi Wen

Stochastic Environmental Research and Risk Assessment, Год журнала: 2024, Номер 38(6), С. 2193 - 2212

Опубликована: Фев. 25, 2024

Язык: Английский

Процитировано

1