River Dynamics and Integrated River Management

Wang, Zhaoyin; Lee, Joseph Hun Wei; Melching, Charles S.

doi:10.1007/978-3-642-25652-3

Cited by 51 publications

(45 citation statements)

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“…D 50 is the median diameter. S p is an index measuring the bed form and roughness, which represents the energy dissipation capacity of the stream bed (Wang et al ., ). The rate of bed load transport per unit width, g b , was measured by the double box sampler method (Zhang, ).…”

Section: Study Area and Methodsmentioning

confidence: 97%

Macroinvertebrate Assemblages in Mountain Streams with Different Streambed Stability

Zhao

Wang

Pan

et al. 2014

River Research & Apps

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Benthic macroinvertebrates are organisms primarily living in the streambed. The stability of the streambed is of vital importance to macroinvertebrate assemblages. Measurement of the streambed stability and sampling of macroinvertebrates were performed from 2005 to 2011 in four mountain streams: the Shengou, Diaoga, Jiangjia and Dabaini Rivers, which have different stability and are all located in the Yunnan plateau in southwestern China. The Shengou, Diaoga and Jiangjia Rivers are composed of gravels and cobbles, and the Dabaini River is mainly composed of gravels. The streambed stability was determined by the ratio of time over the sum of erosion and deposition areas of sediment per unit streambed width at each measured cross‐section. The Shengou River had the highest stability, followed by the Diaoga and Jiangjia Rivers. The Dabaini River had the lowest stability. A total of 70 taxa of macroinvertebrates belonging to 45 families and 68 genera were identified in these streams. Arthropods were the dominant taxonomic group. Collector gatherers had the highest density. Taxa richness, Shannon–Weaver index and K‐dominance curve were used to assess the biodiversity of macroinvertebrates. Results showed that the Shengou River had the highest biodiversity, followed by the Diaoga and Jiangjia Rivers. The Dabaini River had the lowest biodiversity. The detrended correspondence analysis ordination indicated that the streambed stability was the main factor that influenced macroinvertebrate assemblages, counting for 22.7% of the variance. The biodiversity and wet weight of the macroinvertebrates were highly dependent on the streambed stability. The biodiversity increased with the streambed stability and reached equilibrium when the stability was over 20 year m−1. The wet weight of macroinvertebrates showed an increasing trend with the streambed stability. However, no clear relation was identified between the density of macroinvertebrates and the streambed stability. It was concluded from this study that, in order to improve the ecological condition within the mountain streams, erosion and sedimentation must be controlled to enhance the streambed stability. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Study Area and Methodsmentioning

confidence: 97%

Macroinvertebrate Assemblages in Mountain Streams with Different Streambed Stability

Zhao

Wang

Pan

et al. 2014

River Research & Apps

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“…The lotic ecosystems are relatively rarely given proper attention in the scientific literature, being usually obscured by the general water basin approach. These ecosystems are usually named and treated as riparian ecosystems (Wang et al, 2015). The quality of rivers and streams is massively influenced worldwide by the way the riparian ecosystems are used.…”

Section: The Current State Of the Artmentioning

confidence: 99%

Untitled

2019

Carpath. J. Earth Environ. Sci.

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Proper assessments of degradation for lotic ecosystems are of a great importance, given that they provide essential ecosystem services and host some of the most endangered habitats. Currently, one of the most frequently used ways to assess lotic ecosystems integrity is the Water Framework Directive. It implies but important investments in material and human resources, while it is also time consuming. The implementation of a set of indicators, based on available public data, with the aim of assessing the lotic ecosystems integrity could be a good alternative, especially when focusing on large territories. The current study aims at creating a methodology to assess the degradation level of lotic ecosystems, by integrating the above-mentioned indicators into a GIS based multicriteria analysis. The proposed methodology was applied on a sector of one of the most important rivers in Romania, Mureș. The results we have achieved proved the efficacy of this method. In analyses of this kind, the accuracy of the output is directly related to the quality of input data (resolution, update and generalization level), thus a key element in our research was to process and compatibilize the available data to increase accuracy.

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“…The study uses the hydrographs of the simulated runoff (SR) to estimate the 75 % dependable runoff (SR 75 ). SR 75 is an estimate of the runoff that can be expected in the basin, on average, every 3 out of 4 years, and is considered to be a reliable estimate of water availability for augmenting groundwater storage (Wang et al, 2014).…”

Section: Simulating Sub-basin Runoffmentioning

confidence: 99%

Reviving the “Ganges Water Machine”: where and how much?

Muthuwatta

Amarasinghe

Sood

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Runoff generated in the monsoon months in the upstream parts of the Ganges River basin (GRB) contributes substantially to downstream floods, while water shortages in the dry months affect agricultural production in the basin. This paper examines the potential for subsurface storage (SSS) in the Ganges basin to mitigate floods in the downstream areas and increase the availability of water during drier months. The Soil and Water Assessment Tool (SWAT) is used to estimate "sub-basin" water availability. The water availability estimated is then compared with the sub-basinwise unmet water demand for agriculture. Hydrological analysis reveals that some of the unmet water demand in the subbasin can be met provided it is possible to capture the runoff in sub-surface storage during the monsoon season (June to September). Some of the groundwater recharge is returned to the stream as baseflow and has the potential to increase dry season river flows. To examine the impacts of groundwater recharge on flood inundation and flows in the dry season (October to May), two groundwater recharge scenarios are tested in the Ramganga sub-basin. Increasing groundwater recharge by 35 and 65 % of the current level would increase the baseflow during the dry season by 1.46 billion m 3 (34.5 % of the baseline) and 3.01 billion m 3 (71.3 % of the baseline), respectively. Analysis of pumping scenarios indicates that 80 000 to 112 000 ha of additional wheat area can be irrigated in the Ramganga sub-basin by additional SSS without reducing the current baseflow volumes. Augmenting SSS reduces the peak flow and flood inundated areas in Ramganga (by up to 13.0 % for the 65 % scenario compared to the baseline), indicating the effectiveness of SSS in reducing areas inundated under floods in the sub-basin. However, this may not be sufficient to effectively control the flood in the downstream areas of the GRB, such as in the state of Bihar (prone to floods), which receives a total flow of 277 billion m 3 from upstream sub-basins.

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River Dynamics and Integrated River Management

Abstract: The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.

Cited by 51 publications

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Macroinvertebrate Assemblages in Mountain Streams with Different Streambed Stability

Macroinvertebrate Assemblages in Mountain Streams with Different Streambed Stability

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Reviving the “Ganges Water Machine”: where and how much?

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