Repository logo
  • English
  • 中文
Log In
Have you forgotten your password?
  1. Home
  2. College of Engineering / 工學院
  3. Civil Engineering / 土木工程學系
  4. A study of variably saturated numerical model for groundwater flow
 
  • Details

A study of variably saturated numerical model for groundwater flow

Date Issued
2005
Date
2005
Author(s)
Lee, Wen Sen
DOI
zh-TW
URI
http://ntur.lib.ntu.edu.tw//handle/246246/50285
Abstract
The purpose of this study is to develop a Finite-Analytic numerical model to calculate moisture and heat fluxes across the soil-atmosphere interface and the vertical distribution of soil moisture and temperature for the bare soil in the unsaturated zone. With more accurate flux estimates, micrometeorology related and natural ground water recharge predictions are likely to be improved. The study contains the following features: (a) It utilizes the equations for moisture and heat transfer following the works of Chen (1995), and reforms the heat flux at the surface boundary condition for evaporation. (b) It accounts for the temperature effect in the metric head and hydraulic conductivity and uses the experimental results of Hopmans and Dane (1985) to calculate the metric head and the water capacity as functions of temperature. (c) It uses the method of de Vries (1975) to calculate the thermal conductivity as well as the correction factor for the average macroscopic temperature gradient. Both are decided by water content and the volumetric fraction of quartz and clay. (d) It applies a Finite-Analytic Numerical Model for efficient solution of strongly non-linear problems for abrupt changes in atmosphere and soil conditions. (e) The results are tested against field measurements, Jackson (1973) and Jackson et al. (1973). Including surface energy-balance components, water content and soil temperature. According to the results, the simulated and observational trends of the soil water content are difference at begging. With few hours ago, the effect of initial condition is reductive and than the simulated and observational trends of the soil water content is closer to closer. The simulated values of the soil temperature also can response the reasonable physical phenomenon. In the process to calculate the metric head and soil temperature, the convergence and the calculating time of metric head is harder and longer than soil temperature. Otherwise, hydraulic conductivity, soil surface roughness length, and sky cover will influence the varies of soil moisture and soil temperature. The hydraulic conductivity controls and regulates the water movement upward to the surface or downward to the groundwater table where the evaporation or infiltration occurs. The surface roughness length controls the value of mass transfer and sensible heat transfer coefficients, which affects the evaporation rate, latent heat fluxes, and sensible heat flux. The sky cover determines the quantity of solar energy, which can produce significant differences in water content, soil temperature and evaporation rate.
Subjects
理查氏方程式
變飽和度
網格細化
擬三維
滲流面
variably saturated flow
grid refinement
quasi-3D
seepage face
Type
thesis
File(s)
Loading...
Thumbnail Image
Name

ntu-94-D88521015-1.pdf

Size

23.31 KB

Format

Adobe PDF

Checksum

(MD5):65c706539ad7f06cc68f6a286411f7b7

臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of “NTU Repository” with “Academic Hub” to form NTU Scholars.

總館學科館員 (Main Library)
醫學圖書館學科館員 (Medical Library)
社會科學院辜振甫紀念圖書館學科館員 (Social Sciences Library)

開放取用是從使用者角度提升資訊取用性的社會運動,應用在學術研究上是透過將研究著作公開供使用者自由取閱,以促進學術傳播及因應期刊訂購費用逐年攀升。同時可加速研究發展、提升研究影響力,NTU Scholars即為本校的開放取用典藏(OA Archive)平台。(點選深入了解OA)

  • 請確認所上傳的全文是原創的內容,若該文件包含部分內容的版權非匯入者所有,或由第三方贊助與合作完成,請確認該版權所有者及第三方同意提供此授權。
    Please represent that the submission is your original work, and that you have the right to grant the rights to upload.
  • 若欲上傳已出版的全文電子檔,可使用Open policy finder網站查詢,以確認出版單位之版權政策。
    Please use Open policy finder to find a summary of permissions that are normally given as part of each publisher's copyright transfer agreement.
  • 網站簡介 (Quickstart Guide)
  • 使用手冊 (Instruction Manual)
  • 線上預約服務 (Booking Service)
  • 方案一:臺灣大學計算機中心帳號登入
    (With C&INC Email Account)
  • 方案二:ORCID帳號登入 (With ORCID)
  • 方案一:定期更新ORCID者,以ID匯入 (Search for identifier (ORCID))
  • 方案二:自行建檔 (Default mode Submission)
  • 方案三:學科館員協助匯入 (Email worklist to subject librarians)

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science