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class="con_l fl">  <article class="ar_con bg louti"> <div id="vxicey3" class="ar_title"> <h1>風(fēng)力堆積地貌形成的主要?jiǎng)恿?/h1> <div id="wsd9gjd" class="ar_title_b"> <div id="s5rbcv8" class="sub_title clear"> <span id="rvxik3e" class="sp2 c6 fl">時(shí)間：<time class="fxtime">2017-02-07 13:49:33</time></span> <span id="ifhcmgs" class="sp1 c6 fl"><em id="zuozhe" class="noshow">嘉馨</em><em class="user_id noshow">975</em>由 <em class="nickname"></em> 分享</span> <span id="w0defht" class="fl arc_btn"></span> </div> </div> </div> <div id="av9a4jd" class="y_ju"></div> <div id="imk8ue4" class="con_article con_main" id="contentText"> <p> 　　正是由于風(fēng)的湍流特征,才塑造了千姿百態(tài),豐富多彩的風(fēng)沙地貌。學(xué)習(xí)啦小編在此整理了風(fēng)力堆積地貌形成的主要?jiǎng)恿Φ馁Y料，供大家參閱，希望大家在閱讀過(guò)程中有所收獲!</p><h2> 　　風(fēng)力堆積地貌形成的主要?jiǎng)恿榻B</h2><p> 　　風(fēng)積地貌主要是指沙漠地區(qū)的沙丘而言。沙丘在中國(guó)沙漠里分布面積最廣大，連綿的沙丘構(gòu)成了波濤起伏、浩瀚無(wú)垠的茫茫沙海。沙丘有流動(dòng)和固定、半固定之分。流動(dòng)沙丘的表面無(wú)植物覆蓋，或僅在沙丘坡腳有少許植物，覆蓋度在15%以下，風(fēng)沙活動(dòng)強(qiáng)烈，流動(dòng)性大;半固定沙丘的表面，植被呈斑塊狀分布，覆蓋度在15～40%，在植物生長(zhǎng)較好的地方略有粘土或鹽土結(jié)皮現(xiàn)象，有局部風(fēng)沙活動(dòng)，流動(dòng)性較小;固定沙丘有密集的植被覆蓋，覆蓋度超過(guò)40%，或大部分沙丘表面有薄層粘土或鹽土結(jié)皮，不易被風(fēng)吹蝕，比較穩(wěn)定。</p><p> 　　沙丘的形成和發(fā)育受風(fēng)力、地面形態(tài)、水分、植被及沙源供應(yīng)等條件的影響。</p><p> 　　風(fēng)力</p><p> 　　起沙風(fēng)的情況決定著沙丘的總特征，如單向風(fēng)地區(qū)一般以新月形沙丘和沙丘鏈為主，兩組相反方向風(fēng)的作用下形成橫向沙垅。沙丘的排列方向(以沙丘迎風(fēng)坡方位角表示)和起沙風(fēng)合成風(fēng)向大體相一致，但是不可能完全符合，而是有一夾角存在。風(fēng)力還決定著沙丘移動(dòng)的方向和速度，沙丘移動(dòng)的總方向也遵循起沙風(fēng)的合成方向。</p><p> 　　地面起伏</p><p> 　　它使近地面風(fēng)沙流運(yùn)行發(fā)生改變，造成沙丘形態(tài)的差異，特別是山嶺的起伏往往成為風(fēng)沙流運(yùn)行的障礙，在其迎風(fēng)側(cè)沙子大量堆積，形成巨大的沙丘。如塔克拉瑪干沙漠西北葉爾羌河南岸高大沙丘的形成與蝕余殘山有關(guān)。</p><p> 　　地面物質(zhì)組成</p><p> 　　其實(shí)質(zhì)在于沙子供應(yīng)量的多少，關(guān)系著沙丘發(fā)育的規(guī)模。如塔克拉瑪干沙漠邊緣洪積扇上的沙丘都較低矮，原因是地表細(xì)沙、中沙較少;沙漠內(nèi)部沖積平原上的沙丘都較高大，這與地表細(xì)沙、中沙較豐富有關(guān)。</p><p> 　　水分和植被</p><p> 　　水分、植被條件愈好，愈不利于沙丘的發(fā)育。如塔克拉瑪干沙漠的策勒地區(qū)在西北風(fēng)作用下，南部為水分條件很差、無(wú)植被覆蓋的洪積沙礫平原，沙源供應(yīng)較少，形成低矮稀疏的裸露新月形沙丘;中部為洪積- 沖積扇前緣的潛水位較高、有間歇性流水補(bǔ)給的沙質(zhì)平原，植物生長(zhǎng)較好，僅發(fā)育灌叢沙堆;北部是現(xiàn)代流水不能到達(dá)的古河流沖積沙質(zhì)平原，由于有豐富的沙源，水分條件差，植被稀疏，因此形成了高大的沙丘錐。</p><h2> 　　風(fēng)力堆積地貌形成的主要?jiǎng)恿χR(shí)拓展：風(fēng)沙地貌</h2><p> 　　風(fēng)沙地貌在風(fēng)力對(duì)地表物質(zhì)的侵蝕、搬運(yùn)和堆積過(guò)程中所形成的地貌。亦稱(chēng)風(fēng)成地貌，可分為風(fēng)蝕地貌和風(fēng)積地貌兩大類(lèi)。</p><p> 　　青海高寒干旱，位于西風(fēng)帶范圍內(nèi)，全年盛行高空西風(fēng)，風(fēng)力強(qiáng)大，柴達(dá)木盆地、共和盆地、青海湖盆地以及青南高原的大部分地區(qū)尤多西風(fēng)和西北風(fēng)，風(fēng)速〉5米/秒(起風(fēng)沙)的天數(shù)一般在50天以上;加上這些區(qū)域干旱和半干旱的氣候，植被稀少，巖石裸露，第四紀(jì)松散沉積物廣泛堆積，以及人類(lèi)不合理的生產(chǎn)活動(dòng)，致使植被遭到破壞，在風(fēng)力作用下發(fā)育成各種風(fēng)沙地貌。風(fēng)蝕地貌以風(fēng)蝕殘丘和風(fēng)蝕洼地形式廣泛分布于柴達(dá)木盆地西北部，以冷湖一帶最為典型。壟崗之間為風(fēng)蝕洼地，還有風(fēng)蝕谷、雅丹、風(fēng)城、風(fēng)蝕蘑菇等地貌分布。風(fēng)積地貌是風(fēng)力作用堆積而成的各種沙丘和沙堆的總稱(chēng)，廣泛分布于柴達(dá)木盆地南部和東部、青海湖東岸、共和盆地、哈拉湖盆地以及青南高原的中部和西部，主要有新月型沙丘和沙丘鏈、格狀沙丘和格狀沙丘鏈、沙壟、沙堆等。共和盆地沙丘面積達(dá)860平方千米，青海湖東岸湖濱平原上沙丘面積達(dá)320平房千米。</p> </div> <div id="9pohceg" class="y_ju"></div> <div id="98bv35m" class="pnum"> <ul id="page_slice"> <div id="pcwghvm" class="clear"></div> </ul> </div> </article>  <div id="zv0mtjc" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="afyknik" class="lb_3 chao"> <time>08-11</time> <a href="http://lpo831.com/yuwen/yuedudaan/283612.html" title="天坑是如何形成的閱讀題答案" 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