Concurrent monitoring of vessels and water turbidity enhances the strength of evidence in remotely sensed dredging impact assessment

Wu, Guofeng; Leeuw, Jan de; Skidmore, Andrew K.; Prins, Herbert H. T.; Liu, Yanfang

doi:10.1016/j.watres.2007.05.018

Cited by 129 publications

(96 citation statements)

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“…2 Example of the processing of a pair of NIR Aster imagery (20th June 2006) showing the displacement of eight vessels during the 55 s between the capture of the nadir (3N) and the after broom (3B) band, displayed, above according to the original infrared reflectance with low reflective water in black and vessels carrying sands in white, and below after classification with vessels in black and water in white (Table 2), derived from sediment flux measurements and stable isotope studies. Remotely sensed analysis of the location of the vessels led Wu et al (2007) to conclude that the sand mining was concentrated mainly in the channel between Sand Hill and Hukou. Figure 4 shows two high-resolution satellite images taken during low water in winter, revealing dredginginduced scars and local widening of the stream channel created by sand mining.…”

Section: Resultsmentioning

confidence: 99%

“…Extraction of sand and gravel resources has a number of adverse environmental impacts (Sonak et al 2006;Kondolf 1994Kondolf , 1997, which were first reported in the developed world. As a result of the above-mentioned globalization of sand mining, concern about environmental impacts is increasingly reported from other countries: for example China (Wu et al 2007;Lu et al 2007), Ghana (Mensah 2002) and India (Padmalal et al 2008). Consequently, it has been argued that, because of this globalizing extent and the magnitude of its impacts, sand mining should be considered as an aspect of global environmental change (Sonak et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, intensive sand mining has been reported in Poyang Lake (Wu et al 2007). The demand for sand is driven by economic growth in the lower Yangtze River valley, where mega-cities like Shanghai and Wuhan are rapidly expanding (Zhao et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…This led to displacement of dredging to Poyang Lake (Wu et al 2007), an internationally renowned wetland (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…1). The sand mining in Poyang Lake quickly developed into an industry involving hundreds of large vessels and causing highly turbid waters (Wu et al 2007). Environmental concerns over this rapidly growing and uncontrolled sand extraction (Guo 2006;Zhang 2007) resulted in a recent decision by the Jiangxi Provincial Government to temporarily postpone sand mining, as of 1 April 2008, so as to carry out an impact assessment and to develop a plan to regulate resumption of sand extraction at reduced scale (Shanghai Daily 2008).…”

Section: Introductionmentioning

confidence: 99%

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Strategic assessment of the magnitude and impacts of sand mining in Poyang Lake, China

et al. 2009

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Planning for the extraction of aggregates is typically dealt with at a case to case basis, without assessing environmental impacts strategically. In this study we assess the impact of sand mining in Poyang Lake, where dredging began in 2001 after sand mining in the Yangtze River had been banned. In April 2008 concern over the impact on the biodiversity led to a ban on sand mining in Poyang Lake until further plans could be developed. Planning will require consideration of both sand extraction in relation to available sediment resources and also environmental impacts within the context of future demand for sand in the lower Yangtze Valley. We used pairs of near-infrared (NIR) Aster satellite imagery to estimate the number of vessels leaving the lake. Based on this we calculated a rate of sand extraction of 236 million m 3 year -1 in [2005][2006]. This corresponds to 9% of the total Chinese demand for sand. It qualifies Poyang Lake as probably the largest sand mining operation in the world. It also indicates that sand extraction currently dominates the sediment balance of the lower Yangtze River. A positive relation between demand for sand and GDP, revealed by historic data from the USA, suggests that the current per capita demand for sand in China might increase in the near future from 2 to 4 m 3 year -1 . We review various environmental impacts and question whether it will be possible to preserve the rich biodiversity of the lake, while continuing at the same time satisfying the increasing Chinese demand for sand. Finally we review alternative options for sand mining, in order to relieve the pressure from the Poyang Lake ecosystem.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This led to displacement of dredging to Poyang Lake (Wu et al 2007), an internationally renowned wetland (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strategic assessment of the magnitude and impacts of sand mining in Poyang Lake, China

et al. 2009

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Conservation status assessment and a new method for establishing conservation priorities for freshwater mussels (Bivalvia: Unionida) in the middle and lower reaches of the Yangtze River drainage

Liu

Yang

Zanatta

et al. 2020

Aquatic Conservation

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1. The freshwater mussel (Unionida) fauna of the Yangtze River is among the most diverse on Earth. In recent decades, human activities have caused habitat degradation in the river, and previous studies estimated that up to 80% of the Yangtze River's mussel species are threatened or Near Threatened with extinction. However, a comprehensive and systematic evaluation of the conservation status of this fauna has yet to be completed.2. This study evaluated the conservation status of the 69 recognized freshwater mussel species in the middle and lower reaches of the Yangtze River, using the criteria by the International Union for the Conservation of Nature (IUCN). We then developed and applied a new method for prioritizing species for conservation termed Quantitative Assessment of Species for Conservation Prioritization (QASCP), which prioritizes species according to quantifiable data on their distribution and population status, life history, and recovery importance and potential.3. IUCN assessments revealed that 35 (51%) species in the study region are threatened or Near Threatened (i.e. 11 Endangered, 20 Vulnerable, 4 Near Threatened). In addition, 16 species (23%) could not be assessed due to data deficiency. Key threats to the freshwater mussel biodiversity of the Yangtze River include pollution, habitat loss and fragmentation, loss of access to host fish, and overharvesting of mussels and their host fish. The genera Aculamprotula, Gibbosula, Lamprotula, Pseudodon, Ptychorhynchus and Solenaia were identified as particularly threatened. 4. Data availability allowed for QASCP assessment of 44 species. Only Solenaia 4 carinata, regionally Endangered under IUCN criteria, achieved the highest QASCP rank, i.e. First Priority. The five species assessed as Second Priority were considered either regionally Endangered (1), Vulnerable (3) or Data deficient (1) under IUCN criteria. The 23 Third Priority species were assessed as regionally Endangered (2), Vulnerable (15), Near Threatened (2) or Least Concern (4).

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Systematics, distribution, biology, and conservation of freshwater mussels (Bivalvia: Unionida) in China

Liu

Wü

et al. 2022

Aquatic Conservation

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Freshwater mussels (Mollusca: Bivalvia: Unionida) have a broad global distribution on every continent except Antarctica. However, owing to human activities, the diversity of freshwater mussels is seriously globally threatened. China is an important global biodiversity hotspot for this fauna. This article comprehensively reviews the 99 currently recognized species in China, collating for the first time their systematics, distribution, life‐history traits, habitat preferences, conservation status, and main threats to suggest future management actions. The review showed that the taxonomic status and species validity of many freshwater mussels are still not well resolved. The freshwater mussel diversity in the Yangtze River Basin is higher than that in other freshwater habitats in China. Life history characteristics and habitat preferences are poorly known for most species. Only half of the total number of species in China have been assessed for their conservation status. Among those assessed, around half of them are threatened with extinction with more than 10% being considered as Data Deficient. The key threats identified as potentially related to species declines are pollution, habitat loss and fragmentation, loss of access to host fishes and overharvesting of mussels or their host fishes. The review shows that there is a strong geographical bias in the amount of knowledge available for freshwater mussels, with most of the available data being concentrated in the middle and lower reaches of the Yangtze basin. Almost no data are available for these taxa north of the Yellow River basin and in the west and south‐west regions of China. To make future conservation and management more effective we suggest that efforts should be concentrated on: (i) increasing the amount of research on basic ecological and life‐history features, including growth, life‐span, reproductive cycle, host fish identification and habitat requirements of each species; (ii) establishing the interspecific and intraspecific genetic diversity patterns of Chinese freshwater mussels, to clarify their taxonomy, systematics and phylogeny, and to understand the phylogeography and population structure of each species; and (iii) urgently establishing protected areas for fish and mussels in locations of high species richness, such as Poyang Lake and Dongting Lake, and also in regions with high levels of endemism or genetic uniqueness, such as Guangxi Province, Yunnan Province and Heilongjiang Province. In addition, the need for habitat restoration and the conservation of freshwater mussels has become urgent in China, and an integrated systematic conservation and management plan should be developed and effectively implemented.

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Concurrent monitoring of vessels and water turbidity enhances the strength of evidence in remotely sensed dredging impact assessment

Cited by 129 publications

References 13 publications

Strategic assessment of the magnitude and impacts of sand mining in Poyang Lake, China

Strategic assessment of the magnitude and impacts of sand mining in Poyang Lake, China

Conservation status assessment and a new method for establishing conservation priorities for freshwater mussels (Bivalvia: Unionida) in the middle and lower reaches of the Yangtze River drainage

Systematics, distribution, biology, and conservation of freshwater mussels (Bivalvia: Unionida) in China

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