River Delta - musamman al'ummar yanayin kasa

Mafi yawa daga cikin mutane shi ne, abin da shi ne yankin Neja Delta na kogin, amma ba dukan, tunani a kan rawar da ya taka a rayuwar dukkan jinsunan Flora da fauna. Abin da yake wakilta? River Delta - An kafa ta sediments na kogin Shefela located in ta ƙananan ya kai. Mafi sau da yawa shi ne karfi da shiga cikin cibiyar sadarwa na ducts da hoses. Wannan kwaruruka halitta na musamman yanayin kasa. Delta samun da sunan daga daya daga cikin haruffa daga cikin Girkanci haruffa, wanda a cikin nau'i ne karfi da reminiscent na zamanin d triangular Delta na kogin Nilu.

A kan aiwatar da dadewa hulda tsakanin kogin kwarara, teku, ko Oceanic disturbances, iska-surges igiyoyin, tides, da kuma laka kaya a cikin kogin kowane nau'i na musamman da Delta, wanda zai iya daukar har zuwa ɗari da mafi dubu murabba'in kilomita. A ganges yana daukan kusan 106 dubu sq. M. km, yayin da Amazon - 100 dubu murabba'in kilomita.

Delta iya fara daruruwan kilomita daga bakinsa. Delta sa a gaba wasu koguna a cikin teku, ko teku, yayin da wasu - ba. Ƙarƙashin rinjayar tidal koguna kamar da Amazon, Amur, da Likitan mata, Taz, Pur ne Delta, ba su zarce 'yan qasar gaba.

Lokacin da ruwa a cikin kogi yana da wani ma uniform yawa daga seawater, Delta kwakwalwa gaba da Tapered siffar (msl, Neil). Idan kogin ruwa ne mai arziki a cikin ruwan sama, shi ya zama denser fiye da tẽku, sabõda haka, a ƙarƙashin rinjayar ta Delta yakan mallaki wani elongated siffar. A low yawa ruwa kogin deltas aka kafa tare da manyan yawan hoses da ducts (p. Mississippi).

Mafi yawa daga cikin waɗansu kõguna na duniya da Delta da raya alluvial (alluvial) ayyukan. Waɗannan su ne Volga, Lena, Terek, Severnaya Dvina, Kuban da Neva. Mutane da yawa m koguna sun ɓullo "smoothly" tare da m ciyayi da kuma bambance bambancen namun daji. Su gagarumin kamun kifi. Ciyayi wakilta tsirũruwa dabam-dabam, kyauro, kuma bulrush, bushes da itatuwa. Suna son su shirya da tsuntsaye da kuma daban-daban jinsunan dabbobi.

Overemphasized muhimmancin ƙasa haihuwa da kuma danshi dake a cikin kogin yankin Neja Delta. A ƙasashe da dama na duniya a kan su girma da wani gagarumin rabo daga noma amfanin gona. M ciyawa a kan m fadamun, located a cikin ƙananan kai na koguna, ne mai kyau feed don dabbobi. Kwarin da ganges, Kogin Nilu, da Yellow River, da Danube ne yankunan da m aikin noma.

Peculiar ne Delta na Neva River, wanda gudana ta hanyar da swampy Shefela da lebur Neva. Wannan kogin yanaye kasu kashi biyu (harafin yanayin): saman (source - Ivanovskie ƙofofi), 30 km, kuma a kasa (Ivanovskie ƙofofi - bakin), 44 km dogon. A nisa da tushe (kimanin kilomita 15 daga bakin) Forms m Delta Neva jiha ducts sleeved tsibiran da kuma tashoshi. Yana tashi a sakamakon surges da ebbs na ruwa daga teku da kuma a ƙarƙashin rinjayar gudãna ruwaye. A yankin Neja Delta na Neva ne mafi girma a tsibirin Krestovsky, Vasilevsky, Petrograd, da Decembrists. Ta hannayen riga ne Kananan kuma Big Neva Kananan, matsakaici da kuma manyan Neva. Mafi shahara canals - Kewaya, teku, da ƙugiya, Griboyedov.