Quantifying hydrologic impacts following dam construction along the Tana River, Kenya

Maingi, John K.; Marsh, Stuart E.

doi:10.1006/jare.2000.0860

Cited by 206 publications

(148 citation statements)

References 42 publications

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“…edu/data/chirps/ Figure 3 shows the mean annual evolution of monthly precipitation (based on CHIRPS, TRMM, and station rainfall) and discharge averaged for 2011 to 2014. The subcatchment, like the rest of the TRB, experiences bimodal precipitation and discharge patterns (Maingi and Marsh 2002;Oludhe et al 2013). It is observed that the peak month for the rains over MSS occurs during April and November.…”

Section: Precipitation and Dischargementioning

confidence: 99%

Joint atmospheric-terrestrial water balances for East Africa: a WRF-Hydro case study for the upper Tana River basin

Kerandi

Arnault

Laux

et al. 2017

Theor Appl Climatol

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For an improved understanding of the hydrometeorological conditions of the Tana River basin of Kenya, East Africa, its joint atmospheric-terrestrial water balances are investigated. This is achieved through the application of the Weather Research and Forecasting (WRF) and the fully coupled WRF-Hydro modeling system over the MathioyaSagana subcatchment (3279 km 2 ) and its surroundings in the upper Tana River basin for 4 years (2011)(2012)(2013)(2014). The model setup consists of an outer domain at 25 km (East Africa) and an inner one at 5-km (Mathioya-Sagana subcatchment) horizontal resolution. The WRF-Hydro inner domain is enhanced with hydrological routing at 500-m horizontal resolution. The results from the fully coupled modeling system are compared to those of the WRF-only model. The coupled WRF-Hydro slightly reduces precipitation, evapotranspiration, and the soil water storage but increases runoff. The total precipitation from March to May and October to December for WRF-only (974 mm/year) and coupled WRF-Hydro (940 mm/year) is closer to that derived from the Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) data (989 mm/year) than from the TRMM (795 mm/year) precipitation product. The coupled WRF-Hydro-accumulated discharge (323 mm/year) is close to that observed (333 mm/ year). However, the coupled WRF-Hydro underestimates the observed peak flows registering low but acceptable NSE (0.02) and RSR (0.99) at daily time step. The precipitation recycling and efficiency measures between WRF-only and coupled WRF-Hydro are very close and small. This suggests that most of precipitation in the region comes from moisture advection from the outside of the analysis domain, indicating a minor impact of potential land-precipitation feedback mechanisms in this case. The coupled WRF-Hydro nonetheless serves as a tool in quantifying the atmospheric-terrestrial water balance in this region.

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Section: Precipitation and Dischargementioning

confidence: 99%

Joint atmospheric-terrestrial water balances for East Africa: a WRF-Hydro case study for the upper Tana River basin

Kerandi

Arnault

Laux

et al. 2017

Theor Appl Climatol

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“…Rainfall in most of the catchment is low and occurs during two wet seasons, the ''long rains'' (March-May, generally more abundant) and the ''short rains'' (October-December). Mean monthly freshwater discharge is between ;80 m 3 Ás À1 in September and ;300 m 3 Ás À1 in May (Maingi and Marsh 2002). The Tana estuary was sampled near Kipini (2.5318 S, 40.5258 E; Fig.…”

Section: Study Sitesmentioning

confidence: 99%

Importance of terrestrial subsidies for estuarine food webs in contrasting East African catchments

et al. 2013

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Abstract. Little is known on the degree to which terrestrial organic matter delivered to tropical estuaries contributes to estuarine consumers. Here, stable isotope analysis is used to constrain this contribution for contrasting east African estuaries whose catchments differ in relative C3/C4 vegetation cover. As these two types of vegetation differ strongly in d 13 C, we anticipated that terrestrial subsidies would be reflected in a gradient in estuarine consumer d13 C values, following the relative importance of C3 (characterised by low consumer trophic guilds, confirming the incorporation of organic material transported from the catchments by estuarine consumers, and implying that this material is transported up to high trophic level fish. Bayesian mixing models confirmed that C4 material was the most important source for the highly turbid, C4-dominated estuaries, contributing up to 61-91% (95% CI) to phytodetritivorous fish in the Betsiboka, whereas for the less turbid C3-dominated estuaries terrestrial subsidies were not as important and consumers relied on a combination of terrestrial and aquatic sources. This shows that the ecology of the overall catchment affects the estuaries at the most basic, energetic level, and activities that alter the turbidity and productivity of rivers and estuaries can affect food webs well beyond the area of impact.

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“…In contrast, a 478 greater difference was found between the SPI and the SPEI when reservoir storage was examined; 479 this responds over longer timescales, and the cumulative role of temperature was evident in the 480 drought indices. In addition, various studies have shown that reservoirs are subject to evaporation 481 processes (Maingi and Marsh, 2002; Montasery and Adeloye, 2004). These factors could explain 482 why a combined precipitation and evapotranspiration drought index, such as the SPEI, is more 483 appropriate for analysis of the response of reservoir storage than an index, such as the SPI, that 484 considers precipitation alone.…”

Section: Hydrological Drought Index Calculation 185 186mentioning

confidence: 99%

The impact of droughts and water management on various hydrological systems in the headwaters of the Tagus River (central Spain)

Lorenzo‐Lacruz

Vicente‐Serrano

López‐Moreno

et al. 2010

Journal of Hydrology

238

153

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Abstract. The influence of climate variation on the availability of water resources was analyzed in 15 the headwaters of the Tagus River basin using two drought indices, the standardized precipitation 16 index (SPI) and the standardized precipitation evapotranspiration index (SPEI). This basin is highly 17 regulated and strategic, and contains two hyperannual reservoirs that are the origin of the water 18 supply system for Mediterranean areas of southeast Spain. The indices confirmed that drought 19 conditions have prevailed in the headwaters of the Tagus River since the 1970s. The responses in 20 river discharge and reservoir storage were slightly higher when based on the SPEI rather than the 21 SPI, which indicates that although precipitation had a major role in explaining temporal variability 22 in the analyzed parameters, the influence of temperature was not negligible. Moreover, the greatest 23 response in hydrological variables was evident over longer timescales of the climatic drought 24 indices. Although the effect of climate variability on water resources was substantial during the 25 analyzed period, we also showed a major change in hydrological-climatic relationships in regulated 26 systems including reservoir storage and outflow. These were closely related to changes in external 27 demand following commencement of the water transfer system to the Júcar and Segura basins after 28 the 1980s. The marked reduction in water availability in the basin, which is related to more frequent 29 droughts, contrasts with the amount of water transferred, which shows a clear upward trend 30 associated with increasing water demand in the Mediterranean basin. 31 32 33

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Quantifying hydrologic impacts following dam construction along the Tana River, Kenya

Cited by 206 publications

References 42 publications

Joint atmospheric-terrestrial water balances for East Africa: a WRF-Hydro case study for the upper Tana River basin

Joint atmospheric-terrestrial water balances for East Africa: a WRF-Hydro case study for the upper Tana River basin

Importance of terrestrial subsidies for estuarine food webs in contrasting East African catchments

The impact of droughts and water management on various hydrological systems in the headwaters of the Tagus River (central Spain)

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