At the confluence zone, due to the jacking of current from main stream and tributary stream, the mixing and turbulence of current is so strong and the loss of energy is so large that the balance of water and sediment is broken which could causes sediment particle and coarse grain to deposit and forms shallow shoal at river mouth or eyot.

天然河流中存在著大量的干国产迷奸在线观看、支流交匯的河段操女生在线免费看，在干支流相匯處国货自拍网，由于干亚洲色拍一区二区三区、支流兩股水流相互頂托黑人久久，交匯區(qū)內(nèi)水流紊動(dòng)摻混作用強(qiáng)烈色色综合天天色，能量損失很大，干另类区图片小说综合、支河流原有的水沙平衡狀態(tài)被打破黄色网站在线免费下载，可能導(dǎo)致泥沙顆粒亚洲AⅤ综合Av一区导航、尤其是粗顆粒卵石在匯合口處大量淤積，形成河口淺灘或江心灘精品乱子伦一一级大毛片。

The coarse clastic rock of the braided channel of the fan-delta plain is formed when sedimentary water body is in the salinity stage of active tectonic period, the cotemporaneous cementation is intense and the cementation of the carbonate and sulphate has intense packing action in eogenetic stage of shallow buried.

構(gòu)造相對活躍期為沉積水體咸化期中文av黑人人妻av有码中文，主要發(fā)育扇三角洲平原亞相的辮狀河道粗碎屑巖，同生期膠結(jié)作用強(qiáng)看黄的网站，而淺埋藏早成巖階段碳酸鹽和硫酸鹽膠結(jié)物充填強(qiáng)烈黄色视频免费播放网站，致使物性進(jìn)一步變差，并且不利于晚成巖A階段的溶蝕作用進(jìn)行日韩少妇熟女自拍视频网站免费。

The mountain catfish Amphilius uranoscopus preferred shallow habitat(50 cm) with coarse substrate and moderate flow(0.4-1 m/s).

瞻星平鰭鲇通常喜歡生活在水深小于50 cm色视频免费网站在线观看、流速0.4-1 m/s的緩流河段，這里水色較深一级a爰片视频在线观看，河底多卵石亚洲超级碰。