Oxygen and hydrogen isotopes for the characteristics of groundwater recharge: a case study from the Chih-Pen Creek basin,Taiwan   总被引：5，自引：2，他引：3  

Hsin-Fu Yeh  Cheng-Haw Lee  Kuo-Chin Hsu 《Environmental Earth Sciences》2011,62(2):393-402

Assessing the seasonal variation of groundwater recharge is important for effective management of groundwater resources. Stable isotopes of oxygen and hydrogen were used to estimate the sources of groundwater and seasonal contributions of precipitation to groundwater recharge in Chih-Pen Creek basin of eastern Taiwan. Based on the isotopes of precipitation (n = 177), two different local meteoric water regression lines (LMWL) can be obtained for the different seasons: δD = 8.06¹⁸O + 10.08 for wet season precipitation (May through October) and δD = 8.65δ¹⁸O + 17.09 for dry season precipitation (November through April). The slope and intercept of regression line for wet season precipitation are virtually identical to the global meteoric water line (GMWL) of Craig (1961). In contrast to during dry season precipitation due to evaporation effect the intercept of 17.09 is much higher than of the GMWL of 10. The results show the stable isotopes compositions of precipitation decrease with increasing rainfall amount and air temperature, due to the amount effect of precipitation is pronounced. The amount effect is clearly but do not show the temperature effect from January to December 2007. Using a mass-balance equation, a comparison of deuterium excess or d values of precipitation and groundwater indicates the groundwater consist of 76% wet season precipitation and 24% dry season precipitation, representing a distinct seasonal variation of groundwater recharge in study area. About 79% of the groundwater is recharged from the river water of the mountain watershed and 21% is from the rain that falls on the basin.  相似文献   

Equilibrium scour depths around piles in noncohesive sediments under currents and waves     

Ulrich C.E. Zanke  Tai-Wen Hsu  Aron Roland  Oscar Link  Reda Diab 《Coastal Engineering》2011

A universal formula for the estimation of equilibrium scour depth around a single cylindrical pile under the action of steady currents, tidal and short waves is presented.  相似文献   

SPECTRAL DECOMPOSITRION FORMULA FOR REGULARIZATION SOLUTION OF ILL-POSED EQUATION     

Hsu H.T. 《大地测量与地球动力学》2003,23(Z1)

1　IntroductionAwell posedequationhasobviousmathematicalandphysicalmeaningandfitsallofthefollowingconditions:a)solutionexists,b)solutionisunique,c)so lutionisstable .Ifanequationviolatesanyoftheabovethreeconditions,itiscalledincorrectlyposedequation .Ifthesolutionisn’tunique,thecorrespondingequa tioniscalledrankdeficientequation .Ifthesolutionisn’tstable,thecorrespondingequationiscalledill posedequation .Somekindofconstraint,forexam ple ,minimumnormconditionmustbeaddedinor derthattherankdef…  相似文献   

Experiments on uni-directional and nonlinear wave group shoaling     

Kimmoun  Olivier  Hsu  Hung-Chu  Hoffmann  Norbert  Chabchoub  Amin 《Ocean Dynamics》2021,71(11-12):1105-1112

Ocean Dynamics - We report an experimental study addressing the characteristic hydrodynamic transformations of unstable wave groups as well as JONSWAP wave fields propagating from deep-water...  相似文献   

Erratum to: Super-ensemble of three RCMs for climate projection over East Asia and Taiwan     

Chung-Ming Liu  Ming-Chin Wu  Sahana Paul  Ying-Chen Chen  Shu-Hua Lin  Wei-Shiang Lin  Yen-Chih Lee  Huang-Hsung Hsu  Ren-Yow Tzeng  Cheng-Ta Chen 《Theoretical and Applied Climatology》2011,103(1-2):279-279

  相似文献   

Detection and interpretation of the Earth’s free oscillations excited by the great Sumatra-Andaman earthquake with GGP station data     

Houtse Hsu 《地震学报(英文版)》2011,(2):135-141

The mode serials of the Earth’s free oscillation provide some important information on the Earth’s deep structure and superconducting gravimeters (SG) can investigate the phenomena of the Earth’s free oscillations with high accuracy. The great Sumatra-Andaman earthquake fully excited the Earth’s free oscillations and these signals were perfectly recorded by five superconducting gravimeters in the globe. After the pre-treatment and spectral analysis on the SG observation data, we obtained the experimented mo...  相似文献   

A family of explicit algorithms for general pseudodynamic testing   总被引：2，自引：2，他引：0  

Shuenn-Yih Chang  Chi-Wei Hsu 《地震工程与工程振动(英文版)》2011,10(1):51-64

A new family of explicit pseudodynamic algorithms is proposed for general pseudodynamic testing. One particular subfamily seems very promising for use in general pseudodynamic testing since the stability problem for a structure does not need to be considered. This is because this subfamily is unconditionally stable for any instantaneous stiffness softening system, linear elastic system and instantaneous stiffness hardening system that might occur in the pseudodynamic testing of a real structure. In addition, it also offers good accuracy when compared to a general second-order accurate method for both linear elastic and nonlinear systems.  相似文献   

Origin of the mass mortality of the flathead grey mullet (Mugil cephalus) in the Tanshui River, northern Taiwan, as indicated by otolith elemental signatures     

Wang CH  Hsu CC  Tzeng WN  You CF  Chang CW 《Marine pollution bulletin》2011,62(8):1809-1813

A massive fish kill of approximately 50 tons of flathead grey mullet (Mugil cephalus) occurred in August 2006 in the Tanshui River, northern Taiwan. To clarify the origin of these mullets, 42 individuals were randomly collected to determine their ages by reading otolith annuli and to measure the trace elements in the otolith. The total lengths of the fish averaged 32.7 ± 4.4 cm, and most of the individuals were 2 years old, indicating that the mullets in the mass fish kill event were in the immature and growth stages. The Sr/Ca and Ba/Ca ratios of a subsample of 14 otoliths showed that half of the fish killed were estuarine residents, and the rest originated from marine and freshwater habitats. The multiple causes involved in this fish kill implied that additional unknown factors influenced the mullet populations on a large scale and induced them to move quickly and gather at this estuary.  相似文献   

Earthquake risk assessment and optimal risk management strategies for Hi-Tech Fabs in Taiwan     

Wen-Ko Hsu  Wei-Ling Chiang  Cheng-Wu Chen 《Natural Hazards》2013,65(3):2063-2076

In this paper, we build an event-based seismic hazard assessment and financial analysis model for Hi-Tech Fabs in Taiwan. As we know, the low occurrence rate, tremendous loss and high uncertainty are characteristics of earthquake disasters. To handle the above issues, the model integrates knowledge from many fields including earth science, seismology, geology, risk management, structural engineering, the insurance profession, financial engineering and facility management. The portfolio of data from the site survey indicates that the model can be used to calculate the event losses (including buildings, contents and business interruption losses); furthermore the average annual loss and loss exceeding probabilities also can be calculated. The total earthquake risk cost, which includes earthquake insurance premiums, average annual retained loss and equivalent annual retrofit cost, is defined as an indicator for selection of optimal risk management strategies.  相似文献   

Application of a feature-based approach to debris flow detection by numerical simulation     

Chih-Wei Lin  Cheng-Wu Chen  Wen-Ko Hsu  Chia-Yen Chen  Chung-Hung Tsai  Yi-Ping Hung  Wei-Ling Chiang 《Natural Hazards》2013,67(2):783-796

A debris flow is a serious natural disaster which can occur anywhere whether in a valley or on a mountain slope, destroying everything it passes through. Debris flows can occur suddenly and cause residents in the path to suffer casualties and property loss. An early warning system is necessary to reduce the damage in order to protect human life and personal property. However, most debris flow detection systems, like wireless sensors, satellite images and radar, are not suitable for general public use. Vision surveillance systems are generally erected in Taiwan as public devices for security. Therefore, we propose a novel debris early warning system that uses a computer vision technique and build a simulation environment to prove the feasibility.  相似文献