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In order to achieve the harmless treatment and resource utilization of typical lagoon sludge, the sludge from Xiaohai Lagoon in Wanning City, Hainan Province was selected as the research subject. A soft soil curing agent, prepared from bulk industrial solid wastes such as blast furnace slag, steel slag, and industrial gypsum, was employed for sludge stabilization. The results demonstrated that the soft soil hardening agent enhanced the compressive strength, shear strength, and liquid-plastic limit of lagoon sludge while reducing leaching concentrations of heavy metals and their migration/release capacity. Additionally, it improved seed germination index to meet construction land backfill strength requirements and safety standards for garden greening soil. SEM and XRD analysis revealed that silicon and aluminum components in original lagoon sludge participated in hydration reactions under an alkaline environment provided by alkaline activators, steel slag powder and mineral powders. This resulted in numerous holes on the modified sludge surface along with stable crystallites (such as rods, flakes) and hydrated gel state products within a compacted internal structure with enhanced intergranular connections. Consequently, engineering characteristics of lagoon sludge significantly improved after being treated with a soft soil curing agent while effectively solidifying/stabilizing heavy metals present in the sludge to mitigate environmental/ecological toxicity. [ABSTRACT FROM AUTHOR]

The poor stability of the shoal - channel outside the Lingshui Xincun lagoon estuary in Hainan restricts the regulation, development and utilization of the lagoon. In order to study the evolution characteristics of the shoal-channel outside of the lagoon estuary, combined with the topography and geomorphology, coastal dynamics and sediment transportation of the lagoon, compared the remote sensing image data of the lagoon in the past 30 years, the silting changes of the coastline, shoals and deep channel outside the lagoon estuary were analyzed. The study shows that the main axis of the deep channel of the tida linlet outside the lagoon estuary is unstable, and there are also strong erosion and sedimentation changes in the surrounding shoals. The shoal-channel landform has been in the mutual evolution of single channel and double channel, a relatively complete evolution period takes about 10 to 20 years. The coastal sand transport from east to west under the action of wave and flow, and the impact of extreme events such as typhoons are important reasons for the changes of shoal-channel. [ABSTRACT FROM AUTHOR]

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The marine-continent transitional mud shale in Upper Carboniferous Benxi Formation is a potential shale gas exploration target in the eastern Ordos Basin. Based on the systematic observation and sampling analysis of representative profiles and key well, the influencing factors and development pattern of organic-rich mud shale in Benxi Formation of Liulin-Zizhou area, the eastern Ordos Basin were studied, and the development pattern “slow subsidence, terrigenous organic matter supply, and enclosed preservation” of marine-continent transitional organic-rich mud shale was established. The results show that the organic-rich mud shale in Benxi Formation of Liulin-Zizhou area, the eastern Ordos Basin mainly belongs to Jinci and Pangou members, and the lithofacies is mainly clay mud shale with a small amount of siliceous mud shale; the abundance of organic matter is high, and the type is mainly humic; the coal-forming plants flourish in the region because of the hot and humid climate in Benxi depositional period, and result in an abundant supply of organic matter for the sedimentary water; the transgression occurs in the eastern Ordos Basin under the tectonic background of slow subsidence; the high salinity of anoxic water at the bottom maintains reduction environment in the barrier island-lagoon-neritic muddy shelf sedimentary system, which provides a favorable zone for the preservation and enrichment of sedimentary organic matter. [ABSTRACT FROM AUTHOR]

Copyright of Remote Sensing for Natural Resources is the property of Remote Sensing for Natural Resources Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to reveal sequence boundary formation mechanism of large scale craton epicontinental basin and coal accumulation characteristics under paleogeographic setting of isochronous sequence stratigraphic framework, sequence stratigraphic framework and coal accumulation were analyzed for the Permo-Carboniferous of Benxi-Shanxi Formation in the eastern Ordos Basin. A total of four types of sequence boundary are identified, which are regional unconformity surface, transgressive direction turnaround surface (BTR) resulted from settlement difference of basin basement, and normal regressive erosion surface (NSS) , exposed surface (NES) , corresponding conformity surface (NCC) , and river erosion surface(FEU) resulted from compulsory regression, exposed surface (FES), corresponding conformity surface (FCC). Coal-bearing strata is divided into three third-order sequences and six fourth-order sequences. Authores find that cyclical changes of base level controls the occurrence of coal accumulation, coal-base depositional environment and basin basement subsidence rate during coal accumulation period controls seam thickness and continuity. Paleogeographic comprehensive coal accumulation model within isochronous stratigraphic framework is proposed. The results show that widely distributed thick coal seams form around II-type sequence interface and the largest regression surface (initial flooding surface) of I-type sequence; under the lagoon-tidal flat context, coal-center is located in the tidal flat depositional environment, whose remaining accommodation space is small; under the lagoon-delta-tidal flat context, coal-center is located in the tidal flat depositional environment, whose remaining accommodation space is moderate and basement subsidence rate is large; under the shallow river delta context, coal-center is located in the restricted sea and lakes and bays of the delta plain depositional environment, whose remaining accommodation space is large and basement subsidence rate is large. [ABSTRACT FROM AUTHOR]