本文選題：人工深潭　切入點：暫態(tài)存儲　出處：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：不同類型源頭溪流對氮磷等營養(yǎng)鹽滯留和調(diào)節(jié)能力不同,經(jīng)過人為干擾后的溪流對下游水體氮磷營養(yǎng)鹽的滯留研究具有重要意義。為揭示深潭地貌格局的農(nóng)田溪流以及人為干擾試驗對氮磷營養(yǎng)鹽的暫態(tài)存儲以及滯留情況,選擇NaCl為保守示蹤劑、NH_4C1和KH_2P0_4為添加營養(yǎng)鹽,采取恒速連續(xù)投加的方式,開展9次現(xiàn)場示蹤實驗,其中,后四次是在深潭段等距離放置土袋通過人為干擾的方式進(jìn)行的�；贠TIS水質(zhì)模型的分析研究,通過干擾前后自然平直河段與深潭段暫態(tài)存儲指標(biāo)以及營養(yǎng)螺旋指標(biāo)的比較,解析人為干擾試驗對溪流暫態(tài)存儲和氮磷營養(yǎng)鹽滯留的影響,并對模擬參數(shù)進(jìn)行參數(shù)靈敏性分析以及水文參數(shù)進(jìn)行多元統(tǒng)計分析,得到以下主要成果:(1)深潭地貌格局的農(nóng)田溪流深潭段的OTIS模擬的水文參數(shù)D A、As、α均值分別為 0.116rm~2·s~(-1)、0.357m~2、0.380m~2、5.86×10~(-4)s~(-1),平直段水文參數(shù)D、A、As、α均值分別為 0.162m~2·s~(-1)、0.167m~2、0.071m~2、4.11×10~(-3)s~(-1);利用擾動分析法進(jìn)行參數(shù)靈敏度的排序發(fā)現(xiàn),深潭段和平直段四個主要模擬參數(shù)D、A、As、α參數(shù)靈敏性排序結(jié)果均為AAsαD。(2)自然條件下,深潭段F200 med均值為21.97%,平直渠段Fe200med均值為27.97%,且絕大多數(shù)平直段高于深潭段,說明自然條件下平直段暫態(tài)存儲能力比深潭段更強一些;人為干擾后,深潭段F200 med均值為23.94%,平直段Fe200med均值為23.19%,深潭段較平直段偏大,說明人為干擾后深潭段暫態(tài)能力明顯增強且高于平直段。(3)干擾前后,Sw-NH~(4+)和Sw-SRP值均表現(xiàn)為深潭段遠(yuǎn)小于平直段,說明深潭段對于氮磷營養(yǎng)鹽滯留能力強于平直段,且深潭段和平直段Sw值與國內(nèi)外同等尺度的溪流Sw值相當(dāng);干擾后,深潭段溪流的氮磷營養(yǎng)鹽滯留能力明顯提高,Vf和U值等有不同程度的增大、Sw值下降幅度較大;深潭段的干擾試驗,不僅提高了深潭段對氮磷營養(yǎng)鹽的滯留能力,也改變了下游平直段對氮磷營養(yǎng)鹽的滯留能力。(4)深潭渠段與平直渠段的多元統(tǒng)計分析表明,深潭段基本水力參數(shù)q與Ω對溪流暫態(tài)存儲能力影響較大,平直段中暫態(tài)存儲指標(biāo)間存在著不同程度的相關(guān)關(guān)系;在φw、φA、Ts和Ls方面,深潭段與平直段暫態(tài)存儲存在顯著差異性。
[Abstract]:The retention and regulation of nitrogen and phosphorus by streams from different sources are different. It is important to study the retention of nitrogen and phosphorus nutrients in the lower reaches of streams after human disturbance.In order to reveal the transient storage and retention of nitrogen and phosphorus nutrients in farmland streams of deep pool geomorphologic pattern and artificial interference test, NaCl was selected as conservative tracer to add nutrients, and the method of constant speed continuous feeding was adopted.Nine field tracer experiments were carried out, of which the latter four were carried out by artificial interference at the same distance in deep pool.Based on the analysis and study of OTIS water quality model, the effects of human disturbance test on the transient storage and nitrogen and phosphorus nutrient retention of streams were analyzed by comparing the transient storage indexes and nutrient spiral indexes between the natural plain reach and deep pool section before and after the disturbance.The sensitivity analysis of simulation parameters and the statistical analysis of hydrological parameters are carried out.寰楀埌浠ヤ笅涓昏鎴愭灉:(1)娣辨江鍦拌矊鏍煎眬鐨勫啘鐢版邯嫻佹繁娼鐨凮TIS妯℃嫙鐨勬按鏂囧弬鏁癉 A,As,偽鍧囧，

本文編號：1701769