發(fā)布時(shí)間：2018-05-23 10:26

  本文選題：小流域模型 + 地貌發(fā)育��； 參考：《沈陽農(nóng)業(yè)大學(xué)學(xué)報(bào)》2017年05期

【摘要】：流域地貌形態(tài)的科學(xué)量化是研究地貌學(xué)復(fù)雜問題和流域土壤侵蝕模型研究的熱點(diǎn)問題之一。以定雨強(qiáng)模擬降雨作為主要驅(qū)動(dòng)力,以小流域模型不同發(fā)育時(shí)段的DEM數(shù)據(jù)為基礎(chǔ),利用多重分形模型計(jì)算分析了小流域不同發(fā)育階段地貌多重分形及其參數(shù),探討了小流域地貌不同發(fā)育階段的多重分形特征及其表征的流域地貌意義。結(jié)果表明:在小流域地貌發(fā)育的幼年階段,隨著地貌的不斷發(fā)育,地貌奇異指數(shù)分布范圍△α從第2期的0.5085增至第4期的0.6716,呈增長(zhǎng)變化趨勢(shì),平均增長(zhǎng)幅度為16.04%,多重分形參數(shù)△f則呈現(xiàn)出遞減趨勢(shì),降幅為29.96%,這表明在該階段地貌發(fā)育比較活躍,溝谷發(fā)育迅速。在小流域模型地貌發(fā)育的壯年階段,隨著小流域地貌大坡度的地貌單元不斷增加,地貌表面形態(tài)復(fù)雜性和差異性增大,地貌奇異指數(shù)分布范圍△α和多重分形參數(shù)△f的變化趨勢(shì)與地貌發(fā)育幼年階段基本一致,△α呈增長(zhǎng)趨勢(shì),平均增幅度5.94%,△f呈遞減趨勢(shì),平均降幅為21.34%,但二者的變化幅度明顯地減小,這表明壯年階段流域地貌發(fā)育相對(duì)趨于穩(wěn)定,地貌變化趨于緩和。表明多重分形參數(shù)可以科學(xué)定量表達(dá)小流域模型不同發(fā)育階段地貌動(dòng)態(tài)演化特征及地表形態(tài)的不均勻性和復(fù)雜性,對(duì)流域地貌形態(tài)的復(fù)雜體系進(jìn)行定量化研究具有重要的意義。
[Abstract]:The scientific quantification of watershed geomorphology is one of the hot issues in the study of geomorphology and watershed soil erosion model. Based on the DEM data of different development periods of the small watershed model, the multifractal model is used to calculate and analyze the geomorphological multifractal and its parameters in different development stages of the small watershed. The multifractal characteristics of the small watershed geomorphology at different stages of development and the significance of the watershed geomorphology are discussed in this paper. The results show that the distribution range of geomorphological singularity exponent 偽 increases from 0.5085 in the second phase to 0.6716 in the fourth phase with the continuous development of geomorphology in the early stage of geomorphologic development in the small watershed. The average increase range is 16.044.The multifractal parameter f shows a decreasing trend with a decrease of 29.96, which indicates that the geomorphologic development is active and the gully development is rapid in this stage. In the mature stage of geomorphologic development of small watershed model, the complexity and difference of geomorphological surface morphology increased with the increasing of geomorphologic units of large slope of small watershed geomorphology. The variation trend of geomorphological singular exponential distribution range 偽 and multifractal parameter f is basically the same as that of early geomorphologic development, 偽 is increasing, the average increment is 5.94, and f is decreasing. The average decrease is 21.34, but the variation range of both is obviously reduced, which indicates that the geomorphologic development of the basin tends to be stable and the geomorphologic change tends to moderate in the mature stage. It is shown that the multifractal parameters can be used to quantitatively express the dynamic evolution characteristics of geomorphology and the heterogeneity and complexity of surface morphology in different development stages of small watershed model. It is of great significance to quantitatively study the complex system of watershed geomorphology.
【作者單位】： 河南省水利勘測(cè)設(shè)計(jì)研究有限公司;中國科學(xué)院水利部水土保持研究所黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室;溫州大學(xué)生命與環(huán)境科學(xué)學(xué)院;鄭州大學(xué)環(huán)境與水利學(xué)院;
【基金】：國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0402404) 國家自然科學(xué)基金項(xiàng)目(51479180)
【分類號(hào)】：S157.1

【相似文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前3條

1 郭凌俐;黃土區(qū)露天煤礦排土場(chǎng)重構(gòu)土壤孔隙分布的多重分形表征[D];中國地質(zhì)大學(xué)(北京);2015年

2 施文;基于多重分形特征的作物葉片圖像分割技術(shù)的研究[D];湖南農(nóng)業(yè)大學(xué);2015年

3 張萌;黃土區(qū)露天煤礦排土場(chǎng)重構(gòu)土壤顆粒分布的多重分形特征[D];中國地質(zhì)大學(xué)（北京）;2014年

，

本文編號(hào)：1924354