【題目】下圖為我國山西省某地區(qū)示意圖。據(jù)圖回答下列問題:

(1)若大氣降水降落在P點(diǎn)后形成坡面徑流,請(qǐng)?jiān)趫D中畫出P點(diǎn)的徑流方向。

(2)Q地區(qū)建成一座水電站,蓄水位保持在海拔900米,水庫蓄水后的回水淹沒的干流河段大約是 千米。

(3)當(dāng)?shù)卣罅μ岢矘湓炝,a河、b河流域采取了不同的植樹造林模式(如圖a,圖b)。判斷能夠產(chǎn)生更大環(huán)境效益的模式并敘述其理由。

(4)從促進(jìn)該地區(qū)經(jīng)濟(jì)發(fā)展來看,Q城市今后更有利于哪些產(chǎn)業(yè)部門的發(fā)展?

【答案】

(1)垂直于等高線指向低處

(2)75千米

(3)b b河流域綠化帶平行于等高線與坡面徑流方向垂直,因而涵養(yǎng)水源保持水上的作用更大一些。 (4)鋁產(chǎn)品加工、鋁礦開采、煉鋁、化工、旅游、養(yǎng)殖

【解析】

試題分析:

(1)若大氣降水降落在P點(diǎn)后形成坡面徑流,水往低處流。

(2)根據(jù)線段式比例尺知道,圖上1厘米表示實(shí)地距離50千米,量算到干流Q地到900米等高線的圖上距離為1.5厘米,則水電站蓄水位保持在海拔900米,水庫蓄水后的回水淹沒的干流河段大約是75千米。

(3)從圖中考查得知,b河流域綠化帶平行于等高線與坡面徑流方向垂直,因而涵養(yǎng)水源保持水土的作用更大一些,因此b模式能夠產(chǎn)生更大環(huán)境效益。

(4)從圖中可以看出,Q城市附近鋁土資源豐富,水能資源豐富,城市興起的主要區(qū)位因素應(yīng)是自然資源的開發(fā),從促進(jìn)該地區(qū)經(jīng)濟(jì)發(fā)展來看,今后更有利于鋁產(chǎn)品加工、鋁礦開采等產(chǎn)業(yè)部門的發(fā)展。

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