Effect of river damming on nutrient transport and transformation and its countermeasures

Wang, Xun; Chen, Yu; Yuan, Qiusheng; Xing, Xiaofei; Hu, Bin; Gan, Jiawen; Zheng, Y.; Liu, Yunxin

doi:10.3389/fmars.2022.1078216

Cited by 8 publications

(1 citation statement)

References 183 publications

(186 reference statements)

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“…There are nutrient interactions and transformations within the river, owing to the biophysical (including bio lms) and hydrological regime that can make interpreting TN:TP ratios and P limitation di cult 53,54 . It is clear that there is a need for long-term monitoring and integration of multiple data sources to better quantify and understand the movement of nutrient from the catchment to the lake 55,56 .…”

Section: Nutrients and Pesticides Emission In The Catchmentmentioning

confidence: 99%

Agricultural intensification in Lake Naivasha Catchment in Kenya and associated pollution

Onyango,

Kitaka,

Bruggen

et al. 2023

Preprint

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Investments in agricultural intensification in Sub-Saharan Africa aim to fulfill food and economic demands. However, the increased use of fertilizers and pesticides poses ecological risks to water bodies in agricultural catchments. This study focused on assessing the impact of agricultural intensification on nutrient and pesticide pollution in the L. Naivasha catchment in Kenya. The research revealed significant changes in the catchment's agricultural landscape between 1989 and 2019, driven by intensified agricultural expansion. As a result, nutrient and pesticide emissions have worsened the lake's trophic status, shifting it towards hypereutrophic conditions. The study found a weak relationship between total nitrogen (TN) and ∑DDT, indicating that an increase in TN slightly predicted a reduction in ∑DDT. Analysis also showed potential phosphorus (P) limitation at N3 site (Hippo Point) in the lake. Additionally, the observed DDD:DDE and (DDE + DDD):DDT ratios suggest recent use of banned DDT in the catchment. The study concludes that unsustainable agricultural expansion has transformed the L. Naivasha landscape, necessitating the adoption of practices that support water quality management to achieve the UN Sustainable Development Goals.

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Section: Nutrients and Pesticides Emission In The Catchmentmentioning

confidence: 99%

Agricultural intensification in Lake Naivasha Catchment in Kenya and associated pollution

Onyango,

Kitaka,

Bruggen

et al. 2023

Preprint

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Size‐dependent effects of dams on river ecosystems and implications for dam removal outcomes

Brown,

Charles,

Horwitz

et al. 2024

Ecological Applications

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Understanding the relationship between a dam's size and its ecological effects is important for prioritization of river restoration efforts based on dam removal. Although much is known about the effects of large storage dams, this information may not be applicable to small dams, which represent the vast majority of dams being considered for removal. To better understand how dam effects vary with size, we conducted a multidisciplinary study of the downstream effect of dams on a range of ecological characteristics including geomorphology, water chemistry, periphyton, riparian vegetation, benthic macroinvertebrates, and fish. We related dam size variables to the downstream–upstream fractional difference in measured ecological characteristics for 16 dams in the mid‐Atlantic region ranging from 0.9 to 57 m high, with hydraulic residence times (HRTs) ranging from 30 min to 1.5 years. For a range of physical attributes, larger dams had larger effects. For example, the water surface width below dams was greater below large dams. By contrast, there was no effect of dam size on sediment grain size, though the fraction of fine‐grained bed material was lower below dams independently of dam size. Larger dams tended to reduce water quality more, with decreased downstream dissolved oxygen and increased temperature. Larger dams decreased inorganic nutrients (N, P, Si), but increased particulate nutrients (N, P) in downstream reaches. Aquatic organisms tended to have greater dissimilarity in species composition below larger dams (for fish and periphyton), lower taxonomic diversity (for macroinvertebrates), and greater pollution tolerance (for periphyton and macroinvertebrates). Plants responded differently below large and small dams, with fewer invasive species below large dams, but more below small dams. Overall, these results demonstrate that larger dams have much greater impact on the ecosystem components we measured, and hence their removal has the greatest potential for restoring river ecosystems.

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The Changing World

Glibert

2024

Phytoplankton Whispering: An Introduction to the Physiology and Ecology of Microalgae

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Effect of river damming on nutrient transport and transformation and its countermeasures

Cited by 8 publications

References 183 publications

Agricultural intensification in Lake Naivasha Catchment in Kenya and associated pollution

Agricultural intensification in Lake Naivasha Catchment in Kenya and associated pollution

Size‐dependent effects of dams on river ecosystems and implications for dam removal outcomes

The Changing World

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