河網型式 的英文怎麼說
中文拼音 [héwǎngxíngshì]
河網型式
英文
drainage pattern-
A binary tree - based and dyadic indicated codification method is proposed in the digital watershed model ( dwm )
摘要在數字流域模型中提出了一種基於二叉樹理論，並以二元形式表示的河網編碼方法。By making some assumptions, collision frequency were presented. then the the flocculation kinetics model was established through population balance equation. comparison of experimental data and modeling results indicate that there are the same trend between the two. so the model can predict floes number and size during flocculation of yellow river ' s loess particles without using empirical parameters. the tem and sem were used to obsever floes in the study of floe structure. the flocculation was divided as flocculi, floc and floe aggregate. the floes structure model was established by assumption that particles position in floe accords with tetrahedron. the fractal dimension of model and experimental floes was found to be coincidentso the model can reflect the structure of flocs formed in flocculation of yellow river ' s loess particles by macromolecule flocculant at a certain extent
最後，本文還對絮凝動力學和絮體結構進行了研究，在前人研究的基礎上，針對高分子絮凝黃河泥沙，對絮凝過程作了一些符合試驗條件的假設，建立了顆粒碰撞頻率表達式，應用了顆粒數量平衡方程，從而建立了絮凝過程的動力學生長模型，模型計算結果與試驗數據對比表明，二者趨勢一致，在沒有使用經驗參數的情況下基本上能夠描述黃河泥沙絮凝過程中絮體數量和尺寸分佈的變化過程；對絮體結構的研究中，應用掃描電子顯微鏡和透射電子顯微鏡對絮體進行了觀察，將絮體分為絮粒、絮團和絮網三個不同的生長階段，通過假設顆粒結合位置符西安建築科技大學博士學位論文合正四面體，建立了絮體結構模型，計算得到的模型絮體分形維數基本與試驗中的實際絮體相符，在一定程度上能夠反映高分子絮凝黃河泥沙生成的絮體結構。Experiment of eco - economical type of farmland shelternets in hexi corridor area
河西走廊生態經濟型農田林網模式的試驗This paper issues the framework and definition of the codification method in the dwm, delineates a drainage network in this special way with its own numerical character
闡述了數字流域模型河網編碼方法的主要思路和基本定義，給出了這種編碼方法對河網拓撲關系的描述方式，並結合實例分析了其數值特徵。It was first to derive the control equations of numerical models based on the past relevant achievements, and the common numerical - computation methods were introduced and compared after that 1 - d and 2 - d models were both applied according to the condition of the problems. the 1 - d model program was the floris that have been broadly used to model networks of river, and the 2 - d model used fasttabs, a good visualized program package suitable for modeling the shallow waters
在總結前人成果的基礎上，論文首先推導了水流數學模型的基本方程，然後介紹和比較了常用的幾種數值計算方法，根據所研究問題的特點，決定採用一維水流數學模型和二維淺水模型聯合計算模式，其中一維模型採用的是已被廣泛運用於河網計算的數學模型程序floris ，而二維模型採用的是可視化的程序包fasttabs 。It is found that the automatic detection of drainage networks from digital elevation models is affected by flat areas and closed depressions. a variety of methods have been proposed to treat these two features, but it can be seen that the flat areas and closed depressions are processed only after they have been created, so that many spurious and parallel drainage courses are generated
數字高程模型（ dem ）已在分散式流域水文模型中得到了越來越廣泛的應用，但dem中的閉合窪地和平坦區域影響著流域河網的自動提取。目前已提出好多方法來處理這兩種地形，但均針對已經形成的dem單元網格進行處理，結果往往生成偽河道及平行河道。With this method, the feasibility of project can be decided preliminarily. 3. one - dimensional hydrodynamic model is built, in which implicit difference format ( preismann discretization scheme ) and " three steps method " of one - dimensional unsteady flow model is used, hydraulic calculation is done for water diversion and flow strengthen in tidal networks and the method is enhanced in which the precision is improved greatly
建立一維水動力學模型，利用四點隱式差分格式（ preismann格式）和一維河網非恆定流模型的三級解法，對感潮河網的引水增流工程進行了水力計算並對計算方法進行了改進，大大地提高了計算的精度。分享友人