The measured data show that the bedload sediment transport rate is related more closely to the effective stream power within the bed - surface layer than to the river stream power 實測資料表明,推移質輸沙率與床面層內(nèi)有效水流功率有良好的相關性,且高于推移質輸沙率與水流功率的相關性。
Based on the relationship between energy and flow within the bed - surface layer , a relationship between the bedload sediment transport rate and effective stream power within the bed - surface layer is derived 摘要基于床面層內(nèi)的水流能量關系,推導了推移質輸沙率與床面層內(nèi)有效水流功率的關系式。
An expression is derived using basical concepts of physics ( i . e . mass conservation ) , to define the relationship between sediment transport rate and vertical flux of sediment to the seabed 從基本的物理概念和物質守恒定律導出了海底沉積物通量的計算表達式,應用該式取得了與實際海域相符的海底沖淤分布圖。
Verification results of more than 2800 runs of channel experiment data and field data show that this formula has good applicability and high accuracy , and is better than the other formulae for bedload sediment transport rate based on the stream power 經(jīng)2800組試驗資料與天然河流資料的檢驗表明,該關系式的適應性良好,計算精度較高,并優(yōu)于同類型的基于水流功率的推移質輸沙率公式。
The results show that there is a power function relation between rainfall intensity and runoff duration and a linear relation between rainfall intensity and sediment transport rate of unit width , and we find the experienced coefficient of above relations through regression analysis 結果表明,產(chǎn)流時間和降雨強度之間存在冪函數(shù)關系,與單寬輸沙率之間存在線性關系,單寬輸沙率與單寬流量之間亦存在線性關系。
This method is better than the traditional method that relates the divergence of sediment transport rate to the deposition rate . the output of the tidal modelling reaches the required precision according to a comparison between the calculated tidal amplitudes / phases and the observed ones at 42 coastal tide gauge stations 潮汐潮流的模擬計算結果與沿岸42個潮汐測站的實測值結果對比達到了精度的要求,同時,計算得到的各分潮同潮圖與實測結果相符。
Topography fractal dimension related with process of development of watershed physiognomy and represented degree of watershed development , v ) sediment yield intensity of watershed model reflected erosion characteristic of watershed model in different development phase . simulating experiment indicated that sediment yield intensity took on the trend that they changed from small to big then decreased gradually . the relationship of average sediment transport rate and sediment yield rate per mm rainfall with topography fractal demension is expressed by gaussian model and this model is similar with relationship between volume and surface area ( 5 )流域模型產(chǎn)沙強度的變化反映了流域模型在不同發(fā)育階段的侵蝕特征,模擬試驗研究結果表明:在整個流域模型地貌地貌的發(fā)育過程中,其產(chǎn)沙強度呈現(xiàn)由小到大,然后又逐漸減小的總體趨勢,流域模型單位降雨產(chǎn)沙率及平均輸沙率與地形分維數(shù)表現(xiàn)為gaussian模型關系,其關系形式與結論3中相對體積和表面積之間關系相似,進一步說明了以地形分維數(shù)表達地形變化的合理性。