GIS and SBF for estimating groundwater recharge of a mountainous basin in the Wu River watershed,Taiwan     

HSIN-FU YEH  HUNG-I LIN  SHING-TSZ LEE  MIN-HSIANG CHANG  KUO-CHIN HSU  CHENG-HAW LEE 《Journal of Earth System Science》2014,123(3):503-516

The temporal and spatial distributions of precipitation are extremely uneven; so, careful management of water resources in Taiwan is crucial. The long-term overexploitation of groundwater resources poses a challenge to water resource management in Taiwan. However, assessing groundwater resources in mountainous basins is challenging due to limited information. In this study, a geographic information system (GIS) and stable base-flow (SBF) techniques were used to assess the characteristics of groundwater recharge considering the Wu River watershed in central Taiwan as a study area. First, a GIS approach was used to integrate five contributing factors: lithology, land cover/land use, lineaments, drainage, and slope. The weights of factors contributing to the groundwater recharge were obtained from aerial photos, geological maps, a land use database, and field verification. Second, the SBF was used to estimate the groundwater recharge in a mountainous basin scale. The concept of the SBF technique was to separate the base-flow from the total streamflow discharge in order to obtain a measure of groundwater recharge. The SBF technique has the advantage of integrating groundwater recharge across an entire basin without complex hydro-geologic modelling and detailed knowledge of the soil characteristics. In this study, our approach for estimating recharge provides not only an estimate of how much water becomes groundwater, but also explains the characteristics of a potential groundwater recharge zone.  相似文献   

THE FREE-WILSON PARADIGM REDUX:SIGNIFICANCE OF THE FREE-WILSON COEFFICIENTS,INSIGNIFICANCE OF COEFFICIENT ‘UNCERTAINTIES’ AND STATISTICAL SINS     

DAVID LEE DUEWER 《地理学报(英文版)》1990,(4)

The Free-Wilson paradigm is an established and powerful tool for quantitatively relating activity withchemical structure.Current implementations of the paradigm,however,are flawed both conceptually andin execution.As part of an attempt to more fully realize the promise of the paradigm,it was necessaryto examine these limitations in detail.This report introduces a robust,theory-founded Free-Wilson implementation:stepwise principalcomponents regression analysis(SPCRA).SPCRA is computationally superior to previousimplementations but does not in itself correct their conceptual flaws.The development of SPCRA did,however,facilitate derivation of a simple and chemically significantinterpretation of the Free-Wilson structure-activity model.A number of statistical aspects of this modelcommonly misused in previous applications are discussed at length.These discussions provide criticalbackground for the development of an alternative implementation of the Free-Wilson paradigm.  相似文献   

Water vapour ¹⁸O/¹⁶O isotope ratio in surface air in New England, USA     

XUHUI LEE  RONALD SMITH  JOHN WILLIAMS 《Tellus. Series B, Chemical and physical meteorology》2006,58(4):293-304

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Coordinated observations of two large Leonid meteor fireballs over northern New Mexico,and computer model comparisons     

J. ZINN  J. WREN  R. WHITAKER  J. SZYMANSKI  D. O. Revelle  W. PRIEDHORSKY  J. HILLS  G. GISLER  S. FLETCHER  D. CASPERSON  J. BLOCH  R. BALSANO  W. T. ARMSTRONG  C. AKERLOF  R. KEHOE  T. McKAY  B. LEE  M. C. KELLEY  R. E. SPALDING  S. MARSHALL 《Meteoritics & planetary science》1999,34(6):1007-1015

Abstract— This paper describes the coordinated results of several sets of measurements of two Leonid meteor fireballs over northern New Mexico at 1:32 and 3:06 MST, respectively, on the night of 1998 November 17. The measurements included visible band photometry on both events, as well as filtered 5890 Å all-sky images of the Na airglow. Also, for the 3:06 a.m. event, we obtained an infrasound measurement of the hydrodynamic yield. For the 1:32 a.m. event, we obtained a set of visible band charge-coupled device (CCD) camera images of the meteor train for times extending to 30 min after the initial impact. The measurement results have been combined to derive an optical efficiency for the intense early-time optical flash, and the total explosion yields and masses for both of the meteors. We have also done a set of numerical radiation, hydrodynamic, and chemistry computations to investigate the nature and distribution of the long-lasting airglow. We attribute the brightest visible airglow to atomic O 5577 Å line emission, with additional contributions from atomic Na emission and NO₂ chemiluminescence. The near-infrared atmospheric bands of molecular O₂ should be very strong as well. All of the band emissions are expected to show a hollow limb-brightened structure.  相似文献   

淡水双壳类壳体碳同位素研究:以河蚬(corbicula fluminea,Müller 1774)为例   总被引：2，自引：0，他引：2  

闫慧  李心清  周会 《地球化学》2008,37(3)

双壳类壳体碳酸盐(文石)稳定同位素组成已被广泛地用于古气候和古环境重建研究中,但是双壳类壳体碳同位素组成所指示的气候和环境意义一直是争议的问题.对双壳类河蚬(corbicula fluminea)进行了室内养殖,并选取两个壳体样品(壳高,A=13 mm,B=9mm),测定其生长部分壳体和生长期间水体碳同位素,研究表明,随着水体碳同位素的升高(δ13CDIC由-5.24‰升至1.41‰),两壳体碳同位素也随之升高,表明水体对壳体碳同位素的影响;δ13CA分布范围为-4.76‰～2.09‰,δ13CB为-8.49‰～2.89,壳体A和B碳同位素均比预测平衡值偏负,表明壳体在形成过程中利用了新陈代谢产生的富集12C的CO2.根据计算壳体A在实验中沉淀部分壳体利用新陈代谢碳的比例(M值)为24%～43%,平均值为33%;壳体B为33%～75%,平均值为58%.M值随生物的生长呈下降变化,这说明在实验中河蚬主要是通过增加对DIC的吸收和利用来满足壳体生长对物质量增加的需求.  相似文献   

Ammonium nitrogen in surface soil of arid and semiarid Central East Asia     

HU Lu  LEE Xin-qing  HUANG Dai-kuan  CHENG Jian-zhong 《地球化学》2008,37(6)

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针式微萃取结合GC-IRMS测定水溶液中甲酸、乙酸的稳定碳同位素组成     

李心清  黄代宽  章炎麟  江伟  安宁  胡璐  徐刚 《地球化学》2008,37(6)

甲酸和乙酸稳定碳同位素组成（δ^13C）的分析对环境、食品、制药和自然产品等的研究具有重要的应用价值。但目前尚缺乏有效的测定方法。本研究利用最近出现的针式固相微萃取技术（NeedlEX）,以吹扫．捕集方式对水溶液中的有机酸进行了萃取,然后利用气相色谱．同位素比值质谱联用仪（GC—IRMS）对所萃取的有机酸分子进行了占δ^13C的测定。结果显示,质谱计的信号强度与水溶液中有机酸的浓度存在显著的线性相关关系（R^2〉0．99,P〈0．05）,表明Needl EX对水溶液中有机酸具有稳定的萃取能力。在甲酸与乙酸含量分别不低于300μg／mL与200μg／mL的水溶液中,1000mL的吹扫体积可以使两者δ^13C多次分析结果的相对误差分别保持在3％和1％左右,且整个实验流程没有造成可检测的碳同位素分馏作用。低于这两个浓度界线,则分析误差随浓度的降低迅速增加。本研究虽然是针对水溶液中有机酸δ^13C的测定,其萃取方法对其他水溶性挥发和半挥发有机物δ^13C的分析也同样具有应用价值。  相似文献   

DISTRIBUTION OF THE DOMINANT TYPES OF THE FUSULINOID FORAMINIFERA IN THE CHINESE SEAS     

李四光 《地质学报》1931,(1)

Since the publication of the Fusulinidae of North China much information has been obtained from the southern seas of this country of the Carboniferous and Permian Periods. We are now in the position to form a birds eye  相似文献   

A PETROGRAPHICAL STUDY OF THE CHINESE AGALMATOLITES     

H.T.LEE 《地质学报》1928,7(3)

Ⅰ. INTRODUCTION. The most popular Chinese agalmatolites are Shoushanshih (壽山石), Changhuashih (昌化石), Chingtienshih (青田石) and Kwanglushih (廣綠石). They are named after the names of places, as the name Shoushanshih is from  相似文献   

A PRELIMINARY STUDY ON THE CHEMICAL AND MINERALOGICAL COMPOSITION OF LOESS.     

H.T.LEE 《地质学报》1928,7(2):191-208

In general, geologically speaking, it has been noted that if the formation of coal took place during the Permo-Carboniferous period, its volatile matter will al ways be less than 30％ when analized, and the contrary is usually the case for coal created during the Tertiary and Jurassic, these having more than 40％.  相似文献