Sand ecologies, livelihoods and governance in Asia: A …

Granted both China and India are major players when it comes to sand use (Ioannidou et al., 2020) and rapid urbanization (UN-Habitat, 2021), but this geographic concentration leaves important knowledge gaps into how sand mining and its impacts unfold elsewhere in the Asian region. Such geographic imbalances are also seen at a national scale.

Stocks and flows of sand, gravel, and crushed stone in China …

In recent years, China has made great progress in the construction of sandpits and aggregate mines by promoting green mining (Ministry of Natural Resources of China, 2018) …

Trends, challenges, and mitigation strategies for …

This article provides an overview of the use of sand and gravel in China, including current supply and demand conflicts and the impacts of mining, transportation, and use.

Heavy-mineral analysis and provenance of Yellow River

The upper Yellow River, widely regarded to represent a prominent source of sand to the Ordos Desert and loess plateau of northwestern China (Stevens et al., 2013;Nie et al., 2015), flows in turn ...

Devoured: How China's Poyang lake was decimated by dredging and sand …

How China's Poyang lake was decimated by sand mining ... the lake's water flows back out into the river. Sand mining in the main river and its tributaries and lakes is believed to be ...

Demand Analysis on Natural River Sand Used in the

The use of natural river sand is increasing as the construction industry continues to grow. ... Materials demand and environmental impacts of buildings construction and demolition in china based on dynamic material flow analysis. Resour conserve Recycl 72:91–101. Google Scholar Zolgadhar M, Zoomardian SMA (2021) Migration of sand mining pit ...

China vows crackdown on sand mining on Yangtze | Reuters

China has launched a crackdown on illegal sand mining operations on the Yangtze river, which have made large parts of central China more vulnerable to drought. ... 2021 12:16 AM UTC Updated ago

How Sand Mining Devastated China's Largest Freshwater Lake

Sand-dredging boats near an area cleared for sand mining on Poyang Lake, Jiangxi province, December 2019. Photo: Reuters/Aly Song. Over two decades, dredging ships have sucked massive amounts of sand from the bed and shores of Poyang Lake in the eastern Chinese province of Jiangxi, drastically altering the ability of its ecosystem to function.

Impact of anthropogenic activities on morphological and deposition …

The evolution of the Pearl River Estuary (PRE), China in recent decades has been dominated by human activities. ... and sand mining in the Pearl River Estuary for 1972 ... (2021). https://doi ...

An exploration of potential raw materials for prehistoric …

While most previous studies on archaeological ceramics from northwest China have tended to use either only chemical (Cui et al., 2015; Hong et al., 2012; Hung, 2021; Hung et al., 2014) or only petrographic analysis (Womack, 2017) to develop models of ceramic production and circulation in Neolithic northwest China (for rare exceptions see Hein ...

Cleaner production of concrete by using industrial by …

From 2010 to 2020, river sand usage in the Indian construction sector increased from 630 to 1400 million tons [2]. Owing to the problems related to the river sand mining, several countries banned the use of river sand as fine aggregates in concrete. For example, several states in India, namely Bihar, Tamil Nadu, Madhya Pradesh, Rajasthan, Uttar ...

Assessment of Causes and Impacts of Sand Mining on River …

The excavated pit has been known to cause drowning effect in the river leading to death of natives, narrowing of river width, and bank erosion. Earlier, the monitoring and assessment of sand mining activities were difficult but the use of geographical information systems (GIS) and remote sensing techniques has given a unique advantage.

Stocks and flows of sand, gravel, and crushed stone in China …

China's aggregate inflow and stock markedly increased from 1978 to 2018. The aggregate inflow reached a plateau in 2014. The major consuming sectors shifted from …

Potential impacts of climate and anthropogenic-induced …

Rivers play a vital role in connecting land and ocean systems and are responsible for transporting up to 260 Tg/yr of dissolved organic carbon (DOC) and 200 Tg/yr of particulate organic carbon (POC) to the ocean (Raymond and , 2001; Wang et al., 2012; Raymond and Spencer, 2015).However, river ecosystems are currently facing broad climate and …

Microplastic pollution in Yellow River, China: Current status …

Besides the marine environment, river systems also have a higher concentration of microplastics (He BB et al., 2021; Harpah N et al., 2021).Numerous pollution sources of microplastics have influenced the river environment, which may include tail water discharged from sewage treatment plants, the weathering and degradation of plastic wastes in water …

Spatial and Temporal Changes of Sand Mining in the …

In China, sand and gravel demand was approximately 18 billion tons in 2021 (https://; accessed on 3 March 2022). The Yangtze River Basin (YRB) is a …

Characterizing the river water quality in China: Recent …

Among China's Ten River Basins, Hai and Huai River Basins had the poorest water quality with a similar median WQI-DET value of 61.8 in 2016–2018 (Fig. 3 d), while the rest of the basins had WQI-DET values higher than 70. Water quality in Hai and Huai River Basins has significantly improved in recent years (2016–2018).

Census Profile, 2021 Census of Population

This profile presents information from the 2021 Census of Population for various levels of geography, including provinces and territories, census metropolitan areas, communities and census tracts. Data are from the 2021 Census of Population and are available according to the major releases of the 2021 Census release dates: February 9, 2022 – Population and …

An investigation on the effect of sea sand on the …

The global consumption of river sand as a fine aggregate in the production of concrete and mortar is very high. Unfortunately, in the last 20 years, the obtainability of river sand is reducing and several countries have problems in supplying. One option to solve the scarcity of river sand is to use sea sand in the construction field. In the current paper, an attempt has …

Material efficiency to tackle the sand crisis

is currently sourced from river beds3, ... show that the present-day global sand use in building construction amounts to 3.2 ... and China (ClimateWorks Foundation, 2021). 10.

River Sand Characterization for Its Use in …

From Table 2, it can be seen that the bulk density of river sands ranges from 1.6 to 1.8 g/cm 3.This makes it possible to formulate current concretes whose density is close to 2.4 g/cm 3.. 3.2.3. Absolute Densit. In general, studies have shown …

Eight things you should know about the Yangtze River's new …

The relevant river basin management agencies of the Water Administrative Department of the State Council and the local governments at or above the county level in the Yangtze River Basin shall set sand mining areas and periods of sand mining, as well as strictly control sand mining areas, the total quantity of sand mining, and sand mining ...

River Sand Buyers & Importers in China

TradeFord is a growing Manufacturer Directory and B2B Marketplace connecting Global River Sand Importers, Exporters, Suppliers, Traders and Manufacturers at a reliable, common platform.

M-sand boards new terrain

The market for sand in India will grow at a CAGR of 6-7 percent between 2021-2026." ... strict banks imposed by the state governments on river sand usage for construction purposes accelerated demand for m-sand. ... But the problem exists in Asia and other continents. China is the second country to move in the same direction because of the ...

Sandy riverbed shoal under anthropogenic activities: The …

This study examined the sandy reaches downstream of the China Three Gorges Project along the Yangtze River for river erosion and siltation, riverbed morphology, beach evolution, and other physical processes over the past 40 years, to explain the evolution of river geomorphology under human activities, such as reservoirs, improvement projects ...

Effects of Land Use/Cover Change on Terrestrial Carbon …

Accurately assessing and predicting the impacts of land use changes on ecosystem carbon stocks in the Yellow River Basin (YRB) and exploring the optimization of land use structure to increase ecosystem carbon stocks are of great practical significance for China to achieve the goal of "double carbon". In this study, we used multi-year remote sensing data, …

Impact assessment of river sand resource shortage …

More than half of the annual global concrete materials were produced in China due to the rapid developing construction industry, which partly led to the shortage of river sand. However,...

Mix design optimization of seawater sea sand coral …

With the resource shortage in coastal areas, the construction of concrete structures using freshwater and river sand has brought great economic and environmental costs. The use of seawater, sea sand, and coral aggregates in concrete mixes has become an alternative solution for coastal and marine structures, especially for offshore structures and …

River Sand Mining and its Management: A Global Challenge

1.2.1 Sand Mining and Channel Hydrology. In terms of hydraulic consequence, mining induced channel flow changes the threshold limit of hydraulic variables of flow and sediment regime (Rinaldi et al. 2005; Barman et al. 2018).Moreover, both sediment transport behaviour of bedload and suspended load are drastically changes in quarried river, which can …

NATURE GEOSCIENCE

Here we present a material flow analysis of sand from 1995 to 2020 that shows China's overall sand supply surged by approximately 400% over the study period, yet the proportion of natural …

Sand mining: Stopping the grind of unregulated supply chains

Despite the seemingly massive natural 'stocks' of sand, shortages of sand are increasing worldwide, leading to a growth in both domestic and international trade of sand, which amounted to about $2 billion in 2019 (2021). 3 An estimated 42 – 55 billion tonnes of sand are mined every year around the world, from quarries, sand dunes ...

Substantial increase in China's manufactured sand supply …

Here we present a material flow analysis of sand from 1995 to 2020 that shows China's overall sand supply surged by approximately 400% over the study period, yet the proportion of natural …

The Impact of River Sand Mining on Aquatic Ecological

In recent decades, the rapid growth of urbanization and infrastructure construction has led to an increased demand for construction materials, prominently exemplified by the substantial demand for river sand (Bendixen et al. 2021; Ng and Park 2021).River sand, a crucial ingredient in the construction industry, has been extensively exploited due to its exceptional …

Substantial increase in China's manufactured sand …

Our results reveal that China's total sand supply increased approximately fivefold, from ~1.4 Gt yr −1 in 1995 to ~7.0 Gt yr −1 in 2020, to support its unprecedented urbanization and economic...

Trends, challenges, and mitigation strategies for …

Sand, gravel, and crushed rock—together referred to as construction aggregates—are the world's most extracted solid materials by mass. China's annual consumption of construction aggregates ...

Incorporating sea sand into self-compacting concrete: a …

The increasing demand for river sand, driven by infrastructure development, poses environmental challenges. The study aims to address the depletion of river sand by integrating sea sand as a fine aggregate in the production of Self-Compacting Concrete (SCC) through a Systematic Literature Review. Furthermore, it includes an in-depth bibliographic analysis of …

River Sand Mining Vis a Vis Manufactured Sand …

Critical hot spots for sand extraction are China and India. Uncontrolled illegal sand mining is common – reduction in ground water level and water transparency, increased water turbidity, adverse impact on birdlife. ... 2021. This project is …