Holistic water quality dynamics in rural artificial shallow water bodies

Alam, Abul Hasan Md. Badiul; Unami, Koichi; Fujihara, Masayuki

doi:10.1016/j.jenvman.2018.06.076

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…As one of the central low lands of Cambodia, the average annual rainfall in Kampong Speu Province is about 1400 mm (Thoeun, 2015). Tropical Monsoon climate usually shows the characters of a unimodal rainfall intensity curve with a specific long dry spell (Alam et al, 2018), and the catchment area and the command area of Chan Thnal Reservoir are not an exception. The reservoir is operated both in the rainy seasons (May to October) for 1000 ha of agricultural area and in the dry seasons (November to April) for 115 ha, often encountering the problem of abrupt water release to an initially dry bed of the irrigation canal system.…”

Section: Practical Demonstrative Examplementioning

confidence: 99%

Level-set methods applied to the kinematic wave equation governing surface water flows

Mean

Unami

Fujihara

2020

Journal of Environmental Management

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Section: Practical Demonstrative Examplementioning

confidence: 99%

Level-set methods applied to the kinematic wave equation governing surface water flows

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Unami

Fujihara

2020

Journal of Environmental Management

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“…In recent decades, climate change and socio-economic growth have had impacts on available water resources and food security in most parts of the world (Biemans et al 2013;Lee, Bae 2015). Thus, more sophisticated management of existing water resources (Mereu et al 2016;Wałęga et al 2020), environments (Alam et al 2018), and ecosystems (Yaegashi et al 2018) is required to adapt to the impacts.…”

Section: Introductionmentioning

confidence: 99%

Identification of nominal release policies implemented in a multi-purpose water reservoir

Fadhil¹,

Unami²,

Rowshon³

et al. 2022

Meteorol. Hydrol. Water Manage.

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A water reservoir's operation should follow a rational policy to ensure adequate water provision for different purposes without adverse effects. However, it is not well-studied how to identify operational policies currently being implemented. This study establishes a new approach to identifying nominal release policies as implemented in a multi-purpose water reservoir. We chose Bukit Merah Reservoir (BMR), located in Perak State, Malaysia, as a study site to examine its release policies for meeting irrigation, municipal, and industrial water demands and for mitigating floods and environmental hazards. The operator of BMR releases the reservoir's water into two primary irrigation canals, the Main Canal and the Selinsing Canal. Generalized additive models (GAMs) are applied to time series data observed at BMR to identify the annual dynamics of its water management. Operational policies for the release discharges into the two primary irrigation canals are assumed to be based on information on the time-of-year and the reservoir water level. First, a backfitting algorithm identifies each contributing function of the GAMs representing the release policies. Then, spurious oscillations in the functions are removed by total variation (TV) regularization (TVR) to obtain nominal release policies, which are quite reasonable in the sense of conventional reservoir management practice. Finally, the identified nominal release policies are utilized to examine shifts in the operation of BMR during the period from 2000 through 2011. The decomposition of release policies illustrates the two aspects of the irrigation demand's annual patterns and the hydraulic structures' functions. The spurious oscillations removed by TVR are considered to represent indecision by the reservoir operator.

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“…In some cases, advanced mathematical models successfully predict the state of components of aquatic ecosystems [4]. The use of model tools is particularly effective when the calculated values lie within the past range of observations [5].…”

Section: Introductionmentioning

confidence: 99%

Disturbance of Sustainability of the Reservoir Ecosystem: A Model Approach for Assessing and Forecasting the Long-term Process of Eutrophication

Tskhai¹,

Ageikov²

2021

J. sustain. dev. energy water environ. syst.

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The objective of the work is to simulate a long-term process of eutrophication based on the concept of the aquatic ecosystem instability. A model assessment of qualitative effects associated with the development of a succession of aquatic communities during degradation of the ecosystem requires expanding the boundaries of the conventional approach. This raises the question of changing the structure of the reservoir ecosystem model. An idea of the Darwin's principle of natural selection is the key point for assessing changes in the biodiversity structure. The problem was solved through consideration of changes in physiological activities of hydrobionts. The study based on biogeochemical cycles modelling revealed the change in the structure of the ecosystem. Also the novelty of the work is in the implementation of the method for structural-dynamic modelling to assess the trend of long-term eutrophication of the Novosibirsk reservoir, the largest in Western Siberia.

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Holistic water quality dynamics in rural artificial shallow water bodies

Cited by 5 publications

References 18 publications

Level-set methods applied to the kinematic wave equation governing surface water flows

Level-set methods applied to the kinematic wave equation governing surface water flows

Identification of nominal release policies implemented in a multi-purpose water reservoir

Disturbance of Sustainability of the Reservoir Ecosystem: A Model Approach for Assessing and Forecasting the Long-term Process of Eutrophication

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