Lydia Olaka

Lydia Olaka
The Technical University of Kenya

PhD. Geoscience

About

46
Publications
41,228
Reads
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1,218
Citations
Citations since 2017
30 Research Items
907 Citations
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20172018201920202021202220230100200300
20172018201920202021202220230100200300
Additional affiliations
July 2011 - July 2021
University of Nairobi
Position
  • Senior Lecturer
Description
  • Teaching undergraduate and graduate classes, Research on groundwater flow and contamination in the East African rift. Geogenic contaminants in soil and impact on health. Impact of Climate change and variability on water resources.
January 2007 - August 2011
Universität Potsdam
Position
  • PhD Student
January 2006 - July 2006
Regional Centre for Mapping of Resources for Development
Position
  • Intern
Description
  • GIS and RS
Education
January 2007 - August 2020
Universität Potsdam
Field of study
  • Geosciences

Publications

Publications (46)
Article
Full-text available
Mountain environments in East Africa experience more rapid increases in temperature than lower elevations, which, together with changing rainfall patterns, often negatively affect coffee production. However, little is known about the adaptation strategies used by smallholder coffee farmers in Africa. Using the lens of everyday adaptation, semi-stru...
Article
Full-text available
Climate change has the greatest negative impact on low-income countries, which burdens agricultural systems. Climate change and extreme weather events have caused Ethiopia’s agricultural production to decline and exacerbated food insecurity over the last few decades. This study investigates whether farmers’ awareness and perceptions of climate chan...
Article
Full-text available
East Africa is a global biodiversity hotspot and exhibits distinct longitudinal diversity gradients from west to east in freshwater fishes and forest mammals. The assembly of this exceptional biodiversity and the drivers behind diversity gradients remain poorly understood, with diversification often studied at local scales and less attention paid t...
Article
Full-text available
Groundwater dynamics in continental rift zone settings remain poorly understood because of the spatial heterogeneity in flow, storage, and recharge dynamics. The Central Kenya Rift is an excellent example where, though groundwater is important for domestic, irrigation, and geothermal energy exploitation, its hydrogeological properties remain largel...
Article
Full-text available
Hydropower is sustainable and environmentally friendly source of energy worldwide. Driven by streamflow, it is vulnerable to climate change and land use change. The hydropower production from the two existing run-of-river hydropower projects on the Sondu Miriu River is vulnerable to rainfall variability and requires strategies for building resilien...
Article
Full-text available
Environmental exposure to active pharmaceutical ingredients (APIs) can have negative effects on the health of ecosystems and humans. While numerous studies have monitored APIs in rivers, these employ different analytical methods, measure different APIs, and have ignored many of the countries of the world. This makes it difficult to quantify the sca...
Article
Full-text available
Environmental exposure to active pharmaceutical ingredients (APIs) can have negative effects on the health of ecosystems and humans. While numerous studies have monitored APIs in rivers, these employ different analytical methods, measure different APIs, and have ignored many of the countries of the world. This makes it difficult to quantify the sca...
Article
Full-text available
Significance Despite growing evidence of the deleterious effects on ecological and human health, little is known regarding the global occurrence of pharmaceuticals in rivers. Studies assessing their occurrence are available for 75 of 196 countries, with most research conducted in North America and Western Europe. This leaves large geographical regi...
Article
Full-text available
Hydropower is sustainable and environmentally friendly source of energy worldwide. Driven by streamflow, it is vulnerable to climate change and land use change. The hydropower production from the two-existing run-of-river hydropower projects on the Sondu Miriu river are vulnerable to rainfall variability and requires proper understanding of the cli...
Article
Full-text available
Hydropower is cost effective environment friendly and worldwide proven sustainable energy source. Driven by streamflow stream flows, it is vulnerable to climate change and land use change. The hydropower production from the two-existing run-of-river hydropower projects on the Sondu Miriu River are vulnerable to rainfall variability and requires pro...
Data
When using the data please cite: Wilke, F.; Olaka, L.; Schleicher, A. (2020). Mineralogy and Element geochemistry of volcanic rocks and sediments from the central Rift in Kenya. GFZ Data Services. The Central Rift in Kenya (CRK) comprises the lakes Naivasha, Elementaita and Nakuru and the Longonot, Eburru and Menengai volcanos. The alkaline magmas,...
Article
Basalts have shown greater potential for faster and permanent sequestration of anthropogenic CO2 than sedimentary formations. Sequestration occurs through mineral carbonation due to the abundance in divalent minerals making them efficient geological hosts where they occur. Rapid population and industrial growth in developing countries leads to an e...
Article
Full-text available
It is projected that, on average, annual temperature will increase between 2 °C to 6 °C under high emission scenarios by the end of the 21st century, with serious consequences in food and nutrition security, especially within semi-arid regions of sub-Saharan Africa. This study aimed to investigate the impact of historical long-term climate (tempera...
Article
Full-text available
The contribution of oxic methane production to greenhouse gas emissions from lakes is globally relevant, yet uncertainties remain about the levels up to which methanogenesis can counterbalance methanotrophy by leading to CH4 oversaturation in productive surface waters. Here, we explored the biogeochemical and microbial community variation patterns...
Article
Full-text available
Citation: Belay, A.; Demissie, T.; Recha, J.W.; Oludhe, C.; Osano, P.M.; Olaka, L.A.; Solomon, D.; Berhane, Z. Analysis of Climate Variability and Trends in Southern Ethiopia. Climate
Article
Deserts are often considered a low priority landscape in terms of ecosystem services. However, this evaluation may shift once deserts are also considered in terms of geodiversity and human-landscape interactions. We investigated which landscape services (LS) are provided by the desert landscape to two pastoralist communities (Gabra and Borana) in n...
Article
Full-text available
Little is known about the quantity and quality of dissolved organic matter (DOM) in waters from continental geothermal systems, with only a few reports available from the Yellowstone US National Park. In this study, we explored the chemodiversity of DOM in water samples collected from two geothermal hot springs from the Kenyan East African Rift Val...
Article
Full-text available
The advent of anthropogenic global warming and widespread modification of the climate, landscape and environment has brought humans to the fore as a formidable force of nature. The terrestrial and aquatic environment of the East African region is sensitive to a variety of global, regional and local stresses. The geological materials along East Afri...
Article
Full-text available
The world is experiencing variability in precipitation, increased temperature, drought frequencies and intensities. Globally, approximately four billion individuals experience water scarcity due to drought. In Uganda about 10% of the population in the southern and northern parts of the country experience drought related water scarcity annually. Thi...
Article
Organochlorines (OCs) have a high persistence in the environment and toxicity to humans and wildlife. Despite their ban in several countries, they are still found in agricultural areas. Their presence in drinking water resources (rivers, rain and groundwater) in Lake Naivasha area, which has had a booming horticultural industry in the last three de...
Article
Full-text available
Heavy metals retained in sediments pose a threat to aquatic ecosystem and society. Knowledge of the status and sustainability of lake sediment in areas undergoing rapid economic development is scarce, and yet it is required in order to achieve the United Nations Sustainable Development goals. We investigated heavy metal concentration in Lake Naivas...
Article
Full-text available
The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of community-sanctioned data standards in paleoclimatology has largely precluded the benefits of Big Da...
Article
Full-text available
Rivers in the Lake Victoria Basin support a multitude of ecosystem services, and the economies of the riparian countries (Kenya, Tanzania, Uganda, Rwanda, and Burundi) rely on their discharge, but projections of their future discharges under various climate change scenarios are not available. Here, we apply Vector Autoregressive Moving Average mode...
Article
Full-text available
There have been drastic changes in land-use patterns in the Marsabit Forest Reserve (MFR) as a consequence of anthropogenic processes for livelihood improvement over time. The objective of this study was to assess the land-use and land-cover changes (LULCC), especially those related to the forest cover, in the MFR using multi-temporal Landsat image...
Article
Full-text available
This study presents past and projected temporal changes in mean temperature and rainfall around the Marsabit Forest Reserve (MFR), a sub-humid montane forest in Kenya. Rainfall data for the period 1961–2014 and temperature data for the period 1972–2011 were acquired from the Marsabit meteorological station. Future projections (2006–2100) were based...
Article
Full-text available
The Marsabit Forest Reserve (MFR), a green island in an arid environmental setting, generates multiple ecosystem goods and services (ES) to the local community critical for their livelihoods. The forest has been experiencing substantial land conversion for town expansion, agriculture production and settlements threatening long-term ES provision. Su...
Article
Full-text available
Tropical montane forests are amongst the most threatened ecosystems by climate change. However, little is known about climatic changes already observed in these montane areas in Africa, or the adaptation strategies used by pastoralist communities. This article, focused on three mountains in northern Kenya, aims to fill these knowledge gaps. Focus-g...
Article
Full-text available
The quantification of carbon stocks is vital for decision making in forest management, carbon stock change assessment and scientific applications. We applied the land degradation surveillance framework (LDSF) method with a sentinel site of (10 km × 10 km) to assess carbon stock levels and tree diversity in Marsabit Forest Reserve (MFR). The above g...
Article
Groundwater is used extensively in the Central Kenya Rift for domestic and agricultural demands. In these active rift settings groundwater can exhibit high fluoride levels. In order to address water security and reduce human exposure to high fluoride in drinking water, knowledge of the source and geochemical processes of enrichment are required. A...
Technical Report
Full-text available
The ‘WISE-UP to climate’ project aims to demonstrate the value of natural infrastructure as a ‘nature-based solution’ for climate change adaptation and sustainable development. Within the Tana River Basin, both natural and built infrastructure provide livelihood benefits for people. Understanding the interrelationships between the two types of infr...
Chapter
Full-text available
The African Seas include marginal basins of two major oceans, the Atlantic and the Indian, a miniature ocean, the Mediterranean Sea, and an infant ocean, the Red Sea. Understanding the wide spectrum of environmental features and processes of such a varied collection of marine and coastal regions requires that in situ observation systems be integrat...
Article
The water-level record from the 300 m deep paleo-lake Suguta (Northern Kenya Rift) during the African Humid Period (AHP, 15–5 ka BP) helps to explain decadal to centennial intensity variations in the West African Monsoon (WAM) and the Indian Summer Monsoon (ISM). This water-level record was derived from three different sources: (1) grainsize variat...
Thesis
The lakes of the East African Rift System (EARS) have been intensively studied to better understand the influence of climate change on hydrological systems. The exceptional sensitivity of these rift lakes, however, is both a challenge and an opportunity when trying to reconstruct past climate changes from changes in the hydrological budget of lake...
Article
Full-text available
Lake Naivasha, Kenya, is one of a number of freshwater lakes in the East African Rift System. Since the beginning of the twentieth century, it has experienced greater anthropogenic influence as a result of increasingly intensive farming of coffee, tea, flowers, and other horticultural crops within its catchment. The water-level history of Lake Naiv...
Data
Supplementary Fig. 2 PCA biplot of species and sample data. Arrows represent species and circles represent samples. Ellipses indicate the diatom-inferred zones
Data
Supplementary Fig. 1 Lithology, chronology, sampling slices and diatom-based zonation of NSA-3/4. Sediment chronology in years AD, based on seventeen 210Pb dates from NSA-4
Article
Full-text available
The development of the Cenozoic East African Rift System (EARS) profoundly re-shaped the landscape and significantly increased the amplitude of short-term environmental response to climate variation. In particular, the development of amplifier lakes in rift basins after three million years ago significantly contributed to the exceptional sensitivit...
Article
Full-text available
Abstract Sequences of paleo-shorelines and the deposits of rift lakes are used to reconstruct past climate changes in East Africa . These recorders of hydrological changes in the Rift Valley indicate extreme lake -level variations on the order of tens to hundreds of meters during ...
Article
Full-text available
Endemic malaria in most of the hot and humid African climates is the leading cause of morbidity and mortality. In the last twenty or so years the incidence of malaria has been aggravated by the resurgence of highland malaria epidemics which hitherto had been rare. A close association between malaria epidemics and climate variability has been report...
Article
Lakes in the East African Rift have provided excellent proxies to reconstruct past climate changes in the low latitudes. The lakes occupy volcano-tectonic depressions with highly variable climate and hydrological setting, that present a good opportunity to study the climatic and hydrogeological influences on the lake water budget. Previous studies...
Article
Full-text available
Cholera epidemics have a recorded history in the eastern Africa region dating to 1836. Cholera is now endemic in the Lake Victoria basin, a region with one of the poorest and fastest growing populations in the world. Analyses of precipitation, temperatures, and hydrological characteristics of selected stations in the Lake Victoria basin show that c...
Article
Full-text available
AIACC Working Papers, published on-line by Assessments of Impacts and Adaptations to Climate Change (AIACC), is a series of papers and paper abstracts written by researchers participating in the AIACC project. Papers published in AIACC Working Papers have been peer reviewed and accepted for publication in the on-line series as being (i) fundamental...
Article
The demand on available resources has significantly altered our environment. Studies concerning the anthropogenic impact on the environment (particularly land cover change) in Lake Victoria basin are in their infancy. GIS and remote sensing are important in analysis, interpretation and extrapolation. This study analyses the process of human induced...

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