Effect of Long-Term Application of Biosolids for Mine Land Reclamation on Groundwater Chemistry: Nutrients and Other Selected Qualities

The article considers the issue of assessing the long-term results of work on fisheries reclamation in inland waters of fisheries significance in Russia, carried out by the branches of the Federal State Budgetary Institution “Glavrybvod” on the state task in terms of their effectiveness. The relationship between dredging and clearing of watercourse beds and the dynamics of the number of producers of semi-navigable and non-aquatic fish in these rivers during spawning migrations has not been established. With long-term mowing of wetland vegetation in the shallow waters of reservoirs, deltas of large rivers and estuaries, there is no increase in their commercial fish productivity. A number of examples show the opposite effect of this type of work, which leads to a local deterioration of the ecological state of these reservoirs. At the same time, the repeatedly proven method of combating higher aquatic vegetation in the reservoirs of the south of Russia in low water conditions as biomelioration, based on the introduction of fish, consumers of autotrophic products by regional branches of the Federal State Budgetary Institution “Glavrybvod” is practically not used. When installing artificial spawning grounds in the littoral zone of reservoirs, regular ichthyological monitoring of the effectiveness of spawning on them is not carried out. There are no reliable data confirming the significant positive impact of artificial spawning grounds on the population dynamics of commercial fish species of the limnophilic ecological group under conditions of significant spring water level depletion in Russian reservoirs. When catching predatory and low-value fish species in water bodies, legal obstacles arise due to the fact that the volume of seizure of predatory fish includes commercial objects for which the ODE is established annually and their catch is already carried out according to industrial quotas.

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Addition of Tubifex accelerates dewatering of oil sands tailings

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2016-0308 ◽

2016 ◽

Vol 43 (12) ◽

pp. 1025-1033 ◽

Cited By ~ 1

Author(s):

Xiaojuan Yang ◽

Miguel de Lucas Pardo ◽

Maria Ibanez ◽

Lijun Deng ◽

Luca Sittoni ◽

...

Keyword(s):

Oil Sands ◽

Land Reclamation ◽

Test Results ◽

Anionic Polymer ◽

Fine Tailings ◽

Fluid Fine Tailings ◽

Oil Sands Tailings ◽

Set Up ◽

Solids Content

Accelerating dewatering of fluid fine tailings (FFT) to facilitate land reclamation is a major challenge to the oil sands industry in Canada. A new method was tested, addition of Tubifex to FFT. Tubifex is an indigenous earthworm in Canada. The survival rate tests showed that Tubifex can survive in oil sands tailings and penetrate to 42 cm depth (maximum depth tested). Columns (5 L of FFT) were set-up with tailings alone, Tubifex treated tailings and polymer-Tubifex treated tailings. Test results showed that (a) the final mud–water interface of tailings alone was 26% higher than that of Tubifex treated tailings; (b) solids content of Tubifex treated tailings was 21% more than that of tailings alone; (c) Tubifex was capable to accelerate the dewatering process of both cationic and anionic polymer treated tailings; (d) anionic polymer was superior in facilitating long-term dewatering and its coupled effects with Tubifex were better than the cationic polymer.

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Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining

Sustainability ◽

10.3390/su12041528 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1528 ◽

Cited By ~ 4

Author(s):

Ximin Cui ◽

Yuling Zhao ◽

Guorui Wang ◽

Bing Zhang ◽

Chunyi Li

Keyword(s):

Coal Mining ◽

Longwall Mining ◽

Land Reclamation ◽

Surface Subsidence ◽

Mining Subsidence ◽

First Year ◽

Longwall Coal Mining ◽

The Stability ◽

Ecological Reconstruction

Exhausted or abandoned underground longwall mining may lead to long-term residual subsidence on surface land, which can cause some problems when the mined-out land is used for construction, land reclamation and ecological reconstruction. Thus, it is important to assess the stability and suitability of the land with a consideration of residual surface subsidence. Assuming a linear monotonic decrease in the annual residual surface subsidence, the limit of the sum of the annual residual subsidence factor, and continuity between surface subsidence in the last year of the weakening period and the residual surface subsidence in the first year, we establish a model to calculate the duration of residual subsidence and the annual residual surface subsidence factor caused by abandoned longwall coal mining. The duration of residual surface subsidence increases with the increase in mining thickness as well as the factor of extreme residual subsidence. The proposed method can quantitatively calculate the annual residual subsidence, the accumulative residual subsidence, and the potential future accumulative residual subsidence. This approach can be used to reasonably evaluate the stability and suitability of old mining subsidence areas and will be beneficial for the design of mining subsidence land reclamation and ecological reconstruction.

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Trophic Features, Benthic Recovery, and Dominance of the Invasive Mytilopsis Sallei in the Yundang Lagoon (Xiamen, China) Following Long-Term Restoration

Water ◽

10.3390/w11081692 ◽

2019 ◽

Vol 11 (8) ◽

pp. 1692 ◽

Cited By ~ 4

Author(s):

Paolo Magni ◽

Serena Como ◽

Maria Flavia Gravina ◽

Donghui Guo ◽

Chao Li ◽

...

Keyword(s):

Land Reclamation ◽

Environmental Gradients ◽

Oxygen Demand ◽

Current Status ◽

Pest Species ◽

Future Evolution ◽

Mytilopsis Sallei ◽

Biological Tool

A comprehensive set of physicochemical variables in near-bottom water and surface sediments, as well as the soft-bottom macrozoobenthic assemblages were investigated at six sites across the Yundang Lagoon (Southeast China) in November 2012. This lagoon was severely damaged in the 1970s due to domestic and industrial pollution and land reclamation and underwent a massive restoration effort over the past 30 years. Our objectives were to: (1) assess the current trophic and environmental condition of the lagoon; (2) investigate the pattern of spatial variation in the macrozoobenthic assemblages; and (3) assess the benthic recovery in relation to the main environmental gradients and the presence of invasive alien species. Nutrient, chlorophyll-a, biological oxygen demand (BOD5), chemical oxygen demand (CODMn), and total organic carbon (TOC) concentrations were lower than those reported in previous decades, yet organically-enriched conditions occurred at an inner site. From azoic conditions in the 1980s and a few benthic species reported prior to this study, we found a significant increase in benthic diversity with 43 species heterogeneously distributed across the lagoon. The invasive bivalve Mytilopsis sallei was the dominant species, which was associated with the richest benthic assemblage. However, M. sallei is a pest species, and its spatiotemporal distribution should be carefully monitored. These results highlight the central role of the macrozoobenthos in providing important ecological information on the current status of the Yundang Lagoon and as an effective biological tool to follow the recovery’s progress and the future evolution of this highly valued ecosystem.

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Habitat mapping and change assessment of coastal wetlands by using Sentinel-2 time series and ecological expert knowledge

10.5194/egusphere-egu2020-21904 ◽

2020 ◽

Author(s):

Maria Adamo ◽

Valeria Tomaselli ◽

Francesca Mantino ◽

Cristina Tarantino ◽

Palma Blonda

Keyword(s):

Time Series ◽

Land Cover ◽

Coastal Wetlands ◽

Expert Knowledge ◽

Land Reclamation ◽

Habitat Mapping ◽

The Mediterranean ◽

The Impact ◽

Sentinel 2

Coastal wetlands are one of the most threatened ecosystems worldwide. In the Mediterranean Region, wetlands are undergoing rapid changes due to the increasing of human pressures (e.g. land reclamation, water resources exploitation) and climate changes (e.g. coastal erosion), with a resulting habitat degradation, fragmentation, and biodiversity loss.Long-term habitat mapping and change detection are essential for the management of coastal wetlands as well as for evaluating the impact of conservation policies.Earth observation (EO) data and techniques are a valuable resource for long-term habitat mapping, thanks to the large amount of available data and their high spatial and temporal resolution. In this study, we propose an approach based on the integration of time series of Sentinel-2 images and ecological expert knowledge for land cover (LC) mapping and automatic translation to habitats in coastal wetlands. In particular, the research relies on the exploitation of ecological rules based on combined information related to plant phenology, water seasonality of aquatic species, pattern zonation, and habitat geometric properties.The methodology is applied to two Natura2000 sites, &#8220;Zone umide della Capitanata&#8221; and &#8220;Paludi presso il Golfo di Manfredonia&#8221;, located in the northeastern part of the Puglia region. These two areas are the most extensive wetlands of the Italian peninsula and the largest components of the Mediterranean wetland system.Land Cover classes are labelled according to the FAO-LCCS taxonomy, which offers a framework to integrate EO data with in situ and ancillary data. Output habitat classes are labelled according to EUNIS habitat classification.

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MONITORING OF EGYPTIAN COASTAL LAKES USING REMOTE SENSING TECHNIQUES

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-w13-693-2019 ◽

2019 ◽

Vol XLII-2/W13 ◽

pp. 693-699

Author(s):

N. S. Donia ◽

H. Farag

Keyword(s):

Remote Sensing ◽

Land Reclamation ◽

Remote Sensing And Gis ◽

Fish Production ◽

Remotely Sensed Data ◽

Coastal Lakes ◽

Total Fish ◽

Remote Sensing Techniques ◽

Drainage Waters

Abstract. The Northern Lakes play a significant role in Egyptian economy for fish production in Egypt. Until 1991, these Lakes have always contributed more than 40% of the country's total fish production, but at present this has decreased to less than 12.22% as they serve as reservoirs for drainage waters, which contaminated with anthropogenic materials. Since Remote sensing and GIS are suitable and valuable techniques to identify the rate of land reclamation of the coastal lakes over the last three decades. This was undertaken using different kinds of imagery to employ historical remotely sensed data to reveal the long-term changes in the physical characteristics of the lagoon. This paper explains how remote sensing coupled with GIS can be used for lake monitoring applied on some Egyptian coastal lakes as example.

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Mapping paleo-lacustrine environments and long-term climate trends using groundwater chemistry

Hydrogeology Journal ◽

10.1007/s10040-019-02088-8 ◽

2020 ◽

Vol 28 (3) ◽

pp. 987-1002

Author(s):

Alan L. Mayo

Keyword(s):

Groundwater Chemistry ◽

Climate Trends

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A Sudden Turnaround: The Pro-Han Immigration Policy in Manchuria and Its Abrupt Abrogation in Early Qing Era

Ming Qing Yanjiu ◽

10.1163/24684791-12340057 ◽

2021 ◽

Vol 25 (2) ◽

pp. 109-131

Author(s):

Agostino Sepe

Keyword(s):

Twentieth Century ◽

Immigration Policy ◽

Land Reclamation ◽

The State ◽

Chinese People ◽

Short Term ◽

Change Of Direction ◽

To Come ◽

Perfectly Normal

Abstract For most of Qing domination over China, the Manchu rulers strictly controlled or even prohibited migration of Chinese people to the dynasty’s Motherland (long xing zhi di 龍興之地). Only two brief phases are an exception, namely the mid Shunzhi to early Kangxi and Yongzheng periods. During the former, in 1653, a “Regulation for the repopulation and land reclamation of Liaodong” was promulgated, establishing alluring incentives for whoever managed to move a hundred or more people to the region east of the Liao river. Only fifteen years later, when the maneuver had just started to produce some results, the Qing court abolished it. In the long term, such a change of direction appears perfectly normal, considering that later on most of the lands would be assigned to the Eight Banners and the state would have striven to keep the Chinese out. Nevertheless, in the short term, the decision seemed to come out of the blue. An interesting debate on what might have determined the turnabout began in the early twentieth century, and some most recent contributions have been published in the 2000s; yet none of the thesis proposed so far is fully convincing. On the basis of sources that have not yet been taken into account, this paper further investigates into the matter and aims at demonstrating that the concerns which compelled the rulers to officially oppose immigration in the following decades already existed in the very first years of Kangxi reign.

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