Geographical patterns of flow-regime alteration by flood-control dams in Japan

Mori, Takemi; Onoda, Yukio; Kayaba, Yuichi

doi:10.1007/s10201-017-0518-y

Cited by 20 publications

(9 citation statements)

References 46 publications

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“…As a result of the uneven distribution of the main rivers and industrial areas, DOM characteristics in different areas of Nansi Lake may still have some spatial differences even if the dam did not exist. However, presence of the dam could impact on the hydrological connectivity as well as the ow of nutrients, which might exacerbate the discrepancy in Nansi Lake (Rolls and Bond, 2017;Mori et al, 2018;Almeida et al, 2020).…”

Section: Possible Reasons For the Spatial Variation Of Dom In Nansi Lakementioning

confidence: 99%

Characterizing variations of dissolved organic matter (DOM) properties in Nansi Lake: an important reservoir along the eastern route of China’s South-to-North Water Diversion Project

Ren

Yao

et al. 2021

Preprint

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Variations in dissolved organic matter (DOM) quality has far-reaching implications that affect, e.g., aquatic productivity, food web structures, trace element and pollutant transport. In this study, a total of 186 water samples were collected at 62 sites (three points in time within one year) in Nansi Lake. UV-Vis spectra, Synchronous fluorescence (SF) spectra, the excitation-emission matrix and parallel factor analysis (EEM-PARAFAC) were applied to indicate the source and quality of DOM. Water transferring of the eastern route of China’s South-to-North Water Diversion Project had a great influence on the water level of Nansi Lake. Results of SF spectra, EEM-PARAFAC and principal component analysis (PCA) suggested that protein-like substances played a more important role in DOM properties in April and July than October. This result is related to a high fluorescence intensity occurred in April (Fmax=0.72±0.03 in the upper lake and 1.84±0.13 in the lower lake) and July (Fmax=1.10±0.05 in the upper lake and 1.49±0.04 in the lower lake), which might be caused by water transferring from other lakes to Nansi Lake, death and decomposition of submerged plants. At the same time, relatively good correlations were found between humic-like substances, DOC and a254 in April, July and October, which indicated the important contribution of humic-like substances to Nansi Lake. With the completion of the water diversion, the ratio of the fluorescence intensity of component to the total fluorescence intensity (%Fmax) suggested that the proportion of humic-like substances started to increase. And when it came to October, humic-like substances become the main substance in DOM collected from Nansi Lake (%Fmax=66.56%±0.58% in the upper lake and 61.98%±0.99% in the lower lake). Moreover, among the two areas in Nansi Lake, the upper lake always had a higher degree of humification (HIX=2.23±0.06, 2.38±0.11 and 3.10±0.05 in April, July and October, respectively) than the lower lake (HIX=1.06±0.05, 1.68±0.05 and 2.62±0.08 in April, July and October, respectively), which implied extraneous contaminants might have a more important impact on DOM properties in the upper lake.

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Section: Possible Reasons For the Spatial Variation Of Dom In Nansi Lakementioning

confidence: 99%

Characterizing variations of dissolved organic matter (DOM) properties in Nansi Lake: an important reservoir along the eastern route of China’s South-to-North Water Diversion Project

Ren

Yao

et al. 2021

Preprint

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“…In many countries, there are several studies already devoted to impacts of dams on the flow rate change at hourly, daily, monthly, seasonal and intra-annual scales [1,2,5,[8][9][10][11][12]. Downstream, the impacts of dams are generally known to result in a considerable decrease in flow rate change annually due to lower maximum and higher minimum flow.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Seasonal Flow Rate Change Indices Downstream of Three Types of Dams in Southern Quebec (Canada)

Delisle

Assani

2021

Water

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The objective of this study is to use two hydrological indices (coefficients of variation and immoderation) to analyze the impacts of dam management methods on seasonal daily flow rate change downstream of three dams: Manouane (diversion-type management method), Ouareau (natural-type management method) and Matawin (inversion-type management method). The results show that this change is far greater downstream of the Matawin dam (characterized by an inversion-type management method) than downstream of the two other dams. Moreover, downstream of the Matawin dam, this daily flow rate change increases significantly over time, while decreasing downstream of the two other dams and in natural rivers. Lastly, this change is better correlated with climate downstream of the Ouareau dam than downstream of the two other dams. It is positively correlated with winter and spring temperatures as well as summer and fall rain. Contrary commonly accepted hypothesis, this study shows that the impacts of dams generally result in an increase of the seasonal flow rate change in Quebec.

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“…Human-induced land cover change is one of the most direct and influential factors resulting in the decline of biodiversity (Falcucci, Maiorano & Boitani, 2007;Newbold et al, 2015;Sala et al, 2000). Inland wetlands in freshwater ecosystems in particular have been rapidly degraded and connectivity among wetland habitats has decreased due to population growth and related anthropogenic development (Davidson, 2014;Gibbs, 2000;Mori, Onoda & Kayaba, 2018). Wetland habitat conditions are closely related to the species richness, functions, and associated services of wetland ecosystems (Engelhardt and Ritchie, 2001).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "The influence of surrounding land cover on wetland habitat conditions: a case study of inland wetlands in South Korea (v0.1)"

2020

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Wetland ecosystems have been globally degraded and lost due to rapid urbanization and climate change. An assessment of national scale inventory, including wetland types and conditions, is urgently required to understand the big picture of endangered wetlands, such as where they are and how they look like. We analyzed the spatial patterns of each inland wetland type (brackish wetland was included) in South Korea and the relative importance of land cover categories on wetland conditions. The wetlands were grouped into four dominant types (riverine, lake, mountain, and human-made) according to their topography. Riverine wetlands constituted the largest area (71.3%). The relative ratio of wetlands in a well-conserved condition (i.e., "A" rank) was highest in riverine wetlands (23.8%), followed by mountain wetlands (22.1%). The higher proportion of grasslands was related to a better condition ranking, but the increasing bareland area had a negative impact on wetland conditions. We also found that wetlands located near wetland protected areas tend to be in a better condition compared to remote sites. Our results further support the importance of the condition of surrounding areas for wetland conservation.

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Geographical patterns of flow-regime alteration by flood-control dams in Japan

Cited by 20 publications

References 46 publications

Characterizing variations of dissolved organic matter (DOM) properties in Nansi Lake: an important reservoir along the eastern route of China’s South-to-North Water Diversion Project

Characterizing variations of dissolved organic matter (DOM) properties in Nansi Lake: an important reservoir along the eastern route of China’s South-to-North Water Diversion Project

Comparison of Seasonal Flow Rate Change Indices Downstream of Three Types of Dams in Southern Quebec (Canada)

Peer Review #1 of "The influence of surrounding land cover on wetland habitat conditions: a case study of inland wetlands in South Korea (v0.1)"

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