Dispersal and female philopatry in a long-term, stable, polygynous gibbon population: Evidence from 16 years field observation and genetics

2018 ◽  
Vol 80 (9) ◽  
pp. e22922 ◽  
Author(s):  
Naiqing Hu ◽  
Zhenhua Guan ◽  
Bei Huang ◽  
Wenhe Ning ◽  
Kai He ◽  
...  
Keyword(s):  
Field Observation ◽  
Female Philopatry

scholarly journals Water Temperature Observation by Coastal Acoustic Tomography in Artificial Upwelling Area

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2655 ◽  
Author(s):  
Haocai Huang ◽  
Yong Guo ◽  
Zhikun Wang ◽  
Yun Shen ◽  
Yan Wei
Keyword(s):  
Temperature Field ◽  
Field Observation ◽  
Temperature Sensors ◽  
Acoustic Tomography ◽  
Mapping Accuracy ◽  
Temperature Observation ◽  
Comparison Results ◽  
Upwelling Area ◽  
Continuous Temperature

Artificial upwelling is a geoengineering method to repair and improve marine ecosystems, and its operation requires long-term and continuous temperature field observation. However, existing methods are rarely seen to accomplish such observation. In this study, we investigate the coastal acoustic tomography (CAT) to obtain the long-term horizontal temperature field of an artificial upwelling area in an anechoic tank. We conduct four sets of experiments with different CAT station numbers and compare their data with those collected from temperature sensors. By analyzing the travel time from the CAT experiments, the horizontal temperature field of the upwelling area could be mapped. The CAT results and the comparison results show that the surface temperature of the observed area decreases by approximately 3 °C after upwelling, while the temperature of where the CAT is deployed decreases by about 1 °C; the temperature is lowest at the center of the upwelling area. Increasing the number of stations and station spacing would improve the temperature mapping accuracy. Therefore, the feasibility of using the CAT system to observe artificial upwelling is proved valid. This study indicates the potential application of CAT in temperature field observation in artificial upwelling area in the sea.

Postconstruction settlement of an expressway built on peat by precompression

1985 ◽  
Vol 22 (3) ◽  
pp. 308-312 ◽  
Author(s):  
Laval Samson
Keyword(s):  
Key Words ◽  
Field Observation ◽  
Slow Rate ◽  
Peat Deposit ◽  
Secondary Compression ◽  
Secondary Settlement ◽  
Foundation Movement ◽  
Highway Embankments

This paper presents the analysis of 18 years of settlement observations of two expressway embankments built on a peat deposit with an initial depth of 3.0–5.8 m using the precompression technique. Observations show that upon removal of the temporary surcharge the highway embankments heaved for about 1 year by a total of 4.3–7.9 cm. This foundation movement was followed by slow-rate settlement for a few years and subsequently by additional secondary settlement occurring at a greater rate of settlement versus logarithm of time. Eighteen years after construction, settlements range from 2.7 to 11.9 cm. It is concluded that precompression has been effective in reducing postconstruction settlement by about 65% and its effectiveness on the long-term settlement was experienced for [Formula: see text] years. After that, the rate of settlement became identical to that of the normally consolidated peat. Key words: peat, precompression technique, secondary compression, long-term settlement, field observation, swelling, surcharge.

Field Observation of Long-Term Strength of Cement Treated Soil

2003 ◽  
Author(s):  
Hirochika Hayashi ◽  
Jun'ichi Nishikawa ◽  
Kanta Ohishi ◽  
Masaaki Terashi
Keyword(s):  
Field Observation ◽  
Term Strength ◽  
Treated Soil

scholarly journals LONG-TERM FIELD OBSERVATION AND APPLICATION OF WEPP MODEL FOR SEDIMENT YIELD AND TRANSPORT IN NAGURA WATERSHED

2008 ◽  
Vol 52 ◽  
pp. 577-582 ◽  
Author(s):  
Kazutoshi OSAWA ◽  
Syunsuke IKEDA ◽  
Ryuzaburo KUBOTA ◽  
Keigo NODA ◽  
Yoshihisa AKAMATSU
Keyword(s):  
Sediment Yield ◽  
Field Observation ◽  
Term Field

SIMULATION OF NITRIFICATION AND DENITRIFICATION PROCESSES IN A TIDAL RIVER

1994 ◽  
Vol 30 (2) ◽  
pp. 43-52 ◽  
Author(s):  
Tetsuya Kusuda ◽  
Tohru Futawatari ◽  
Kyoko Oishi
Keyword(s):  
Water Quality ◽  
Field Observation ◽  
Tidal River ◽  
Sediment Surface ◽  
Water Volume ◽  
Water Quality Control ◽  
Laboratory Test Results ◽  
Nitrification And Denitrification ◽  
Term Field

Nitrification and denitrification processes in a well mixed tidal river in Japan are modeled, based on results of long term field observation on water quality and sediments in the river. Laboratory test results and values in references are used for the determination of parameters and coefficients in the model. In modeling of the processes, sediments, suspended solids, and overlying water are taken as elements and in computation a Lagrangian reference frame in terms of accumulated water volume is employed for reduction in numerical dispersion. Simulation results on ammonium and nitrate nitrogen, showing good agreement with long term field observation results, qualitatively explain well the processes in the river. The results indicate some countermeasures to reduce nitrate more such as the increase in the area of sediment surface. The simulation model is available for the estimation of water quality in well mixed tidal rivers and applicable for water quality control.

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