scholarly journals Evaluation of the Influence of Jiangxiang Reservoir Immersion on Corp and Residential Areas

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jing Chen ◽  
Yong Huang ◽  
Yongmei Yang ◽  
Jingjing Wang
Keyword(s):  
Numerical Methods ◽  
Capillary Rise ◽  
Field Investigation ◽  
Scientific Basis ◽  
Critical Depth ◽  
Residential Areas ◽  
Project Investment ◽  
Reservoir Impoundment ◽  
Rise Height

Reservoir immersion is an environmental geological issue. Jiangxiang reservoir was taken as an example, where both analytical and numerical methods were employed to calculate the banked-up water level after reservoir impoundment, based on the hydrological, meteorological, geological, and hydrogeological conditions. The capillary rise height of soils in the reservoir area was determined through in situ measurement and laboratory analysis. The depth of foundation and crop roots in residential areas can be obtained by field investigation. The critical depth to groundwater was calculated according to the height of capillary rise and land elevation. Furthermore, the influence of reservoir immersion was evaluated, which provides a scientific basis for the relocation of people in reservoir areas, planting of crops, and project investment.

A Simple Approach to the Study of Wave Patterns

2014 ◽  
Vol 156 (A3) ◽  
Keyword(s):  
Numerical Methods ◽  
Shallow Water ◽  
Froude Number ◽  
Critical Speed ◽  
Graphical Method ◽  
Three Dimensional ◽  
Simple Approach ◽  
Critical Depth ◽  
Simple Manner ◽  
Wave Patterns

The paper revisits some pioneering work of Sir Thomas Havelock on wave patterns with particular attention focused on his graphical method of analysis. Motivated by a desire to explore this method further using numerical methods, it is extended in a simple manner to give three-dimensional illustrations of the wave patterns of a point disturbance in deep and shallow water. All results are confined to the sub- and trans-critical regimes with some obtained very close to the critical Depth Froude Number. Some conclusions are drawn on the wave types produced when operating close to the critical speed and their decay with distance off.

scholarly journals Case Study: Influence of Three Gorges Reservoir Impoundment on Hydrological Regime of the Acipenser sinensis Spawning Ground, Yangtze River, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Yinjun Zhou ◽  
Zhijing Li ◽  
Shiming Yao ◽  
Miner Shan ◽  
Chao Guo
Keyword(s):  
Sediment Load ◽  
Hydrological Regime ◽  
Three Gorges ◽  
Spawning Ground ◽  
Chinese Sturgeon ◽  
The Three Gorges ◽  
Reservoir Impoundment ◽  
River Cross Section

After the construction of the Three Gorges Dam (TGD) in China, the downstream has been affected by the reduction in sediment discharge and regulation of flow processes, which have resulted in severe scouring and changes hydrological regime. Consequently, the spawning ground of Chinese sturgeon distributed along the downstream Yichang reach could be affected. This study examined the effects of TGD on the streamflow, sediment load and channel morphology downstream based on in situ measured data. Results showed that, after the impoundment of the TGD, sediment load at the downstream Yichang hydrological station decreased significantly, and the Yichang reach continued to be scoured. The distribution of erosion was uneven, and the scouring mainly occurred in the branching channels. The channel gradient and riverbed roughness increased with the erosion of the river cross section. After more than 10 years of erosion, the riverbed scouring and armouring in the Yichang reach was basically completed, thus we expected that the spawning grounds of Chinese sturgeon could be retain as the riverbed tends to be stable. The findings in this work have implications in the protection of the critically endangered Chinese sturgeon.

scholarly journals Using CPTs to derive thermal properties of soil

2020 ◽  
Vol 205 ◽  
pp. 04005
Author(s):  
Philip J. Vardon ◽  
Joek Peuchen
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Laboratory Tests ◽  
Field Investigation ◽  
Volumetric Heat Capacity ◽  
Cone Penetration ◽  
Cone Penetration Tests ◽  
Penetration Tests ◽  
Properties Of Soil

A method of utilizing cone penetration tests (CPTs) is presented which gives continuous profiles of both the in situ thermal conductivity and volumetric heat capacity, along with the in situ temperature, for the upper tens of meters of the ground. Correlations from standard CPT results (cone resistance, sleeve friction and pore pressure) are utilized for both thermal conductivity and volumetric heat capacity for saturated soil. These, in conjunction with point-wise thermal conductivity and in situ temperature results using a Thermal CPT (T-CPT), allow accurate continuous profiles to be derived. The CPT-based method is shown via a field investigation supported by laboratory tests to give accurate and robust results.

scholarly journals Stability Assessment of Landslides in Dahuaqiao Reservoir Area Based on Back Analysis of Slope Monitoring

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yu-xiao Wang ◽  
Yu-jie Wang ◽  
Long Jiang ◽  
Ping Sun ◽  
Xingchao Lin ◽  
...  
Keyword(s):  
Back Analysis ◽  
In Situ Monitoring ◽  
Hydropower Project ◽  
Slope Failures ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Reservoir Area ◽  
Reservoir Impoundment ◽  
Slope Instabilities

Dahuaqiao Hydropower Station is the sixth cascade hydropower project on the upper stream of the Lancang River, and a number of slope instabilities were found in the reservoir area before reservoir impoundment. The reservoir impoundment and fluctuation of the reservoir water level generally reactivate these potential slope failures or trigger new ones. Therefore, how to cope with the influence of these slope failures on dam safety has always been the focus of attention. However, it is unwise to stabilize all these potentially instable slopes by remedial measures. Based on a two-parameter and four-level back analysis method proposed in this paper, reasonable measures for landslide management are suggested on the basis of the in situ monitoring results and back analysis of geomaterial strength parameters.

scholarly journals Determining Favourable and Unfavourable Thermal Areas in Seoul Using In-Situ Measurements: A Preliminary Step towards Developing a Smart City

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2320 ◽  
Author(s):  
You Jin Kwon ◽  
Dong Kun Lee ◽  
Kiseung Lee
Keyword(s):  
Land Cover ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Smart Cities ◽  
Distribution Data ◽  
Sensible Heat ◽  
Residential Areas ◽  
Coverage Ratio ◽  
Study Results

Urban heat island effects (UHIE) are becoming increasingly widespread, thus, there is an urgent need to address thermal comfort, which significantly influences the daily lives of people. In this study, a means of improving the thermal environment by spatial analysis of heat was implemented to ensure basic thermal comfort in future smart cities. Using Seoul as the study site, the relationship between sensible heat and land cover type was used to identify heat islands in this city. Thereafter, k-means clustering was employed to extract unfavourable and favourable thermal areas. High sensible heat indicates locations where environmental heat needs to be mitigated. Sensible heat distribution data were used for spatial typification to formulate an effective land cover factor to mitigate the UHIE. In-situ net radiation data measured at six sites were utilised to confirm the spatial typification of the thermal environment. It was found that expanding the green space by 1% reduces the sensible heat by 4.9 W/m2. Further, the building coverage ratio and green coverage influence the sensible heat in compact residential areas. The study results can be used to establish spatial planning standards to improve the thermal environments of sustainable cities.

Construction Site Noise and its Influence on Protected Area of the Existing Buildings

2014 ◽  
Vol 1041 ◽  
pp. 419-423 ◽  
Author(s):  
Radka Kantová ◽  
Vít Motyčka
Keyword(s):  
Protected Area ◽  
Government Regulation ◽  
Noise Pollution ◽  
Space Structures ◽  
Construction Site ◽  
Existing Buildings ◽  
Residential Areas ◽  
Noise Sources ◽  
Software Support

The article addresses the problem of noise from the perspective of protected building space near the construction. If they are near a building already populated, the residents should not be exposed to elevated noise burden, and according to Government Regulation No. 272/2011 of 24 August 2011 on health protection before adverse effects of noise and vibrations, which are set noise limits. In the process optimization production planning is therefore necessary to address the areas of in-situ noise, its creation, modeling, design methodologies to assess the overall noise at the site. The Article analyzed the issue introduction of new approaches when optimizing for the site and the necessity aspects of noise pollution site in construction technological preparations for the construction. The article defines in detail the sources of noise during construction, dealing with modeling of site noise sources and the value of the protected space structures. It presents examples of noise studies, where captured effect of noise on the nearest places protected sites and residential areas. Presents the methodology of work with the values of the inputs and outputs when working with software support.

The Wiluna Meteorite fall, Western Australia—2 September 1967

1970 ◽  
Vol 37 (292) ◽  
pp. 880-887 ◽  
Author(s):  
G. J. H. McCall ◽  
P. M. Jeffery
Keyword(s):  
Western Australia ◽  
British Museum ◽  
Field Investigation ◽  
Reasonable Estimate ◽  
Total Recovery ◽  
Nickel Iron ◽  
Australian Museum ◽  
Meteorite Fall ◽  
Western Australian

SummaryThe fall of a shower of meteorites numbering several hundred fragments at Wiluna, Western Australia, on the night of 2 September 1967, has been investigated. Although the dispersion ellipse had been largely obscured by removal of fragments before a party of scientists were able to make a field investigation, it has, nevertheless, been possible to make a reasonable estimate of the shower distribution pattern. In spite of this removal of fragments, a number of pieces of meteorite were still found in situ. The bulk of the total recovery is in the collections of the Western Australian Museum, and the physical characteristics of these masses and their petrography is described. In all, some 490 individual fusion-crust coated stones and a large number of broken stony fragments are known to have been recovered. The meteorite is an olivine bronzite chondrite remarkably rich in discrete nodules of nickel iron, up to an inch across, commonly aggregated with troilite. A full chemical analysis of this fresh meteoritic material has been supplied by the British Museum (Natural History).

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