Influences of channelization on discharge of suspended sediment and wetland vegetation in Kushiro Marsh, northern Japan

Nakamura, Futoshi; Sudo, Tadashi; Kameyama, Shuichi; Jitsu, Mieko

doi:10.1016/s0169-555x(96)00031-1

Cited by 63 publications

(62 citation statements)

References 15 publications

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“…인간 활동이 활발해지면서 농업, 하천공사 및 산림벌채 등의 개발이 급속도로 증가하고 있으며, 이로 인해 강우 시 다량의 토사가 유출되고 있다 (Nakamura et al, 1997(Nakamura et al, , 2002Walling et al, 2003;Mizugaki et al, 2006;Ahn et al, 2006;2009;2010). 토지이용 변화로 인해 산림에서 생산된 토사는 바다까지 유출·퇴적되고 있어 토사의 이 동 범위는 매우 광범위하다고 할 수 있다.…”

Section: 서 론unclassified

“…토지이용 변화로 인해 산림에서 생산된 토사는 바다까지 유출·퇴적되고 있어 토사의 이 동 범위는 매우 광범위하다고 할 수 있다. 특히 유출된 토 사는 장기간동안 호수와 범람원 등에 퇴적되어 수질, 지 형과 식생 등의 자연생태계를 변화시키는 원인이 되고 있다 (Ahn et al, 2006;2008;2009;2010; Ahn and Nakamura, 토사를 습지와 호수 등으로 유입·퇴적시키고 있다 (Nakamura et al, 1997;2004;Ahn et al, 2006;Mizugaki et al, 2006;Ahn and Nakamura, 2009). …”

Section: 서 론unclassified

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Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating

Ahn¹,

Kiwan²,

Lee³

et al. 2014

Journal of Korean Forest Society

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210Pb dating was conducted to examine the influence of land use changes in the forest catchment on lake sedimentation. The Kushiro River, into which Lake Takkobu drains under regular flow conditions, contributed to an increased sedimentation rate in sampling point at the lake outflow because turbid water from the Kushiro River flows back into Lake Takkobu during floods. The elevated sediment flux from the catchment dilutes the /year is observed until the 1880s, whereas lake sedimentation accelerated to 0.03-0.09 g/cm 2 /year following land use changes such as deforestation and channelization, between the 1880s and 1940s. In particular, the sedimentation rates have been associated with deforestation, channelization, agricultural development and road construction, since the 1980s, and these rates were about 9-28 times higher than those under natural conditions, leading to accelerated lake shallowing.

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Section: 서 론unclassified

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating

Ahn¹,

Kiwan²,

Lee³

et al. 2014

Journal of Korean Forest Society

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“…As a result, runoff containing elevated nutrient and sediment from farmland has flowed directly into the mire. Previously these materials were deposited in the upstream sections of the mire and were not transported directly into the mire before the river channelization works (Nakamura et al, 1997;Nakayama and Watanabe, 2004). Dominant indigenous species in the mire include alder (Alnus japonica), reed (Phragmites australis), moss (Polytrichum spp., Sphagnum spp.…”

Section: Introductionmentioning

confidence: 99%

Simulation of hydrologic and geomorphic changes affecting a shrinking mire

Nakayama¹

2009

River Research & Apps

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The Kushiro Mire in subarctic Japan has significantly reduced in size because of the complex interaction of many processes, including snowmelt runoff, sediment transport and vegetation dynamics. This study uses a coupled integrated catchment-based eco-hydrology model with a mass transport process (NICE-MASS) to investigate the influence of hydrologic and geomorphic changes on the Kushiro Mire. Coefficients of the sediment-rating curve in the snowmelt runoff are very different from those in the snow-free period. This empirical relation shall underestimate the observed suspended sediment (SS) concentration in the snowmelt period, indicating a difference in runoff mechanisms between the two periods and the necessity of a process-based model. The simulation model reproduced well the spatial distribution of elevation aggradations by sediment deposits from rivers flowing into the mire. NICE-MASS clarified that river channelization works carried out in the past resulted in groundwater degradation and drying phenomenon in the downstream area because of increased sedimentation and a decrease of seepage infiltration from the river to the aquifer. It is assumed that these hydrologic and geomorphic changes are closely related to the invasion of alder (Alnus japonica) into the mire. The occupation rate of alder is positively correlated with groundwater degradation relative to the ground surface. The model simulation derived by addition of this limiting factors related to submerged depth is important for prediction of vegetation succession when devising future policies for restoration of meandering river channels.

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“…A consequence of straightening is that the river stretch is shortened and subsequently the river gradient and flow velocity increase, in turn influencing the suspended sediment load (e.g., Nakamura et al, 1997).…”

Section: Human Interference By River Managementmentioning

confidence: 99%

Concepts of dynamic equilibrium of interest for river management in the lower Maas catchment

Vandenberghe¹,

Venhuizen²,

Moor³

2011

Geogr.Pol.

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This paper discusses the interaction between climate change, land use, water management and internal evolution within a river catchment, applied to the Maas River catchment. It is based on the results of a project carried out as part of the Dutch research programme "Climate Changes Spatial Planning", theme "Climate Scenarios". These results were obtained by a combination of proxy reconstructions and by numerical modelling of past, present-day and near-future climate and river evolution. Since external factors like climate change and human impact influence the river system in such a way that they will have severe consequences for society, economy and public health, understanding of the cause-and-effect relations within a river basin appears to be of utmost importance. Therefore, a background framework for accurate water management strategies, based on the intrinsic factors and external driving factors (climate, human impact) influencing the Maas River, has been developed. Together with the simulations, which give a good overview of the trends in precipitation and discharge between 4000-3000 BP and 1000-2000 AD (as well as an outlook to the 21 st century), the proxies help to gain insight into the long-term changes in climate and hydrology in the Maas River basin. It appears that the principles of the dynamic equilibrium in a river system provide most useful guidelines for such a background. From the reconstructed river evolution it is illustrated what kind of effects may be expected from each natural or anthropogenic distortion of that equilibrium for flood risks, changes in river course and morphology, and fluvial transport capacity. It is concluded that river management, including compliance with the recent European directives for maintenance of natural heritage of river systems, should find a balance between providing the possibility to the river to maintain a dynamic equilibrium, based on its reconstructed historical river behaviour, and necessary measures as directed by practical social and economic needs.

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Influences of channelization on discharge of suspended sediment and wetland vegetation in Kushiro Marsh, northern Japan

Cited by 63 publications

References 15 publications

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating

Simulation of hydrologic and geomorphic changes affecting a shrinking mire

Concepts of dynamic equilibrium of interest for river management in the lower Maas catchment

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Influences of channelization on discharge of suspended sediment and wetland vegetation in Kushiro Marsh, northern Japan

Cited by 63 publications

References 15 publications

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined210Pb Dating

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined210Pb Dating

Simulation of hydrologic and geomorphic changes affecting a shrinking mire

Concepts of dynamic equilibrium of interest for river management in the lower Maas catchment

Contact Info

Product

Resources

About

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating